A B C D E F G H I J K L M N O P Q R S T U V W X Y and Z Special characters and Numerics

This site contains terms and definitions from many IBM software and hardware products as well as general computing terms.


See device adapter.

See designated approving authority.

See database as a service.

See deactivate link.

See deactivate logical unit.

See deactivate physical unit.


  1. See document access definition.
  2. See Disciplined Agile Delivery.

DAD script
A file that is used by the DB2 XML Extender, either to compose XML documents from existing DB2 data or to decompose XML documents into DB2 data.

DADSM interrupt recording facility (DIRF)
A provision that ensures that an error is recorded if a system fails or a permanent I/O error occurs during allocation of space or during performance of a routine that updates the volume table of contents (VTOC). The DIRF turns on a bit in the VTOC upon entry to a direct access device space management (DADSM) function and, if no errors occur during processing, turns off that bit upon exiting from that function.

See document access definition extension.

DADX group
A folder that contains database connection (JDBC and JNDI) and other information that is shared between DADX files within the group.

DADX runtime environment
The DADX runtime environment provides information to the DADX web service, including the HTTP GET and POST bindings, the test page, WSDL generation, and the translation of DTD data into XML schema data.

See dump analysis and elimination.

A program that runs unattended to perform continuous or periodic functions, such as network control.

daemon configuration file
In the Distributed Computing Environment (DCE), a file containing information about which daemons are configured on the host, including which environment variables are set, the parameters to pass to the process, the minimum restart interval, and the timeout period.

daemon process
A process begun by the root user or the root shell that can be stopped only by the root user. Daemon processes generally provide services that must be available at all times, such as sending data to a printer.

See destination address field.

See directed acyclic graph.

daily digest
A daily summary of the latest updates from Activities.

daily job
A script that runs from the authoring server in an IBM Commerce on Cloud environment for a WebSphere Commerce service offering. This script is responsible for coordinating the routine daily tasks that are typically required for a WebSphere Commerce site to run, such as data loads, search indexing, and data propagation.

daily planning
The process of creating a current plan.

daily stand-up
See scrum.

daily wash-up
In DSDM, a brief daily meeting to review progress and encourage communication. See also scrum.

daisy chain

  1. See serial connection.
  2. In CICS intercommunication, the chain of sessions that results when a system requests a resource in a remote system, but the remote system discovers that the resource is in a third system and has itself to make a remote request.

See digital asset management.

damaged file
A physical file in which read errors have been detected.

damaged logical unit of work
The effect on protected resources caused by part of the resources committing and part rolling back.

damaged object
In iSeries, an object that is corrupted, that requires repair before it can be used.

See directory access protocol.

See dynamic automatic reconfiguration.

dark data
Operational information, often unstructured, that organizations collect, process and store through the course of regular business activity, but fail to use or apply for other purposes.

dark fibre
In fibre-optic communications, the fibre infrastructure that is in place but not being used.

dark web
A network of thousands of websites that use anonymity tools to purposely conceal their IP addresses. See also deep web.

See Defense Advanced Research Projects Agency.

Darwin Information Typing Architecture (DITA)
An IBM architecture that supports authoring of information-typed topics for task-oriented information sets.


  1. See dual-attachment station.
  2. See direct-attached storage.

See direct access storage device.

DASD conservation option
In Tivoli NetView for OS/390, an installation option that allows Tivoli NetView for OS/390 to be installed without the online help facility and hardware monitor data presentation panels.

DASD fast write (DFW)
A function in which data is written concurrently to cache and nonvolatile storage, and automatically scheduled for destaging to DASD. Both copies are retained in the storage control until the data is completely written to the DASD, providing data integrity equivalent to writing directly to the DASD. Use of DASD fast write for system-managed data sets is controlled by storage class attributes to improve performance. See also cache fast write, dynamic cache management.

DASD sharing
An option that lets independent computer systems use common data on shared disk devices.

DASDVOL authority
See DASD volume authority.

DASD volume
A direct access storage device (DASD) space identified by a common label and accessed by a set of related addresses. See also primary storage.

DASD volume authority (DASDVOL authority)
An authority level that allows operations personnel to access only the volumes they must maintain.


  1. A user interface component that provides a comprehensive summary of pertinent information from various sources to the user.
  2. A web page that can contain one or more widgets that graphically represent business data.
  3. A graphical user interface that presents information and enables users to control specific activities.
  4. A collection of actionable key performance indicators displayed to the user.
  5. A graphical user interface that enables users to monitor and manage activities. A dashboard provides a consolidated view of status information that is obtained from various sources.
  6. A collection of key reports in a visual format that is designed for various user functions. All frequently used reports can be monitored in a single page using a dashboard.
  7. An interface that integrates data from a variety of sources and provides a unified display of relevant and in-context information.
  8. A module that migrates real-time data streams such as computer aided dispatch into a monitoring interface.
  9. In agile software development, a tool for tracking progress that displays metrics such as the number of total tasks, user stories and a burndown or velocity chart.

A user-configurable panel that is displayed on a dashboard page to provide access to project information and activities.

A representation of facts or instructions in a form suitable for communication, interpretation, or processing by human or automatic means. Data includes constants, variables, arrays, and character strings.

data abstraction
A data type with a private representation and a public set of operations (functions or operators) which restrict access to that data type to that set of operations. The C++ language uses the concept of classes to implement data abstraction.

data access bean
A class library that provides a rich set of features and functions, while hiding the complexity associated with accessing relational databases.

data access model
An object that describes entities in a data source that will be processed by data management services.

data access permission
Access to data in a particular category, for example, medical and public health data, or environmental data. This access is associated with a data category group.

data access statement
A subset of SQL statements that can be used to grant and revoke permissions and to lock tables.

data acquisition engine
A component of Tivoli Provisioning Manager that gathers and preprocesses metrics from each managed application.

data aggregate

  1. In PL/I, an array or a structure.
  2. A logical collection of data elements that can be referred to either collectively or individually.

data aggregation
A process whereby raw data is gathered and expressed in a summary form for statistical analysis.

data analyst
A specialist who consults with users, business analysts, and stakeholders and then creates and runs processes in order to review and analyze the content, structure, and quality of data.

data archive
A storage area for backup copies of files.

data area

  1. An area of memory that contains specific control variables that are normally predefined in structures or vectors.
  2. A system object used to communicate data, such as CL variable values between the programs within a job and between jobs. The system-recognized identifier for the data area is *DTAARA.
  3. A memory area that is used by a program to hold information.
  4. An area of a predefined length and format on a panel in which data can be entered or displayed. A field can consist of one or more data areas.

data asset
A unit of storage, such as SAN storage arrays.

data at rest encryption
Encryption that is used to protect the data in databases that is not moving through networks.

data attribute
A specific piece of descriptive information about an object (item) or organization. Examples of item data attributes include product number, product description, product price, and company name.

data authority
A specific authority to read, add, update, or delete data, to run a program, or to search a library or directory.

data availability
The degree to which data is available when needed, typically measured as a percentage of time that the system would be capable of responding to any data request (for example, 99.999% available).

data availability as a service
A cloud-enabled disaster recovery as-a-service solution that combines hardware, software, and services to replicate client’s data from their primary site to a resilient data center.

data bag
A container of object properties that the MQAI uses in administering queue managers. There are three types of data bag: user (for user data), administration (for administration with assumed options), and command (for administration with no options assumed).

database (DB)
A collection of interrelated or independent data items that are stored together to serve one or more applications. See also database server.

database access thread (DBAT)
A thread that accesses data on a local subsystem on behalf of a remote subsystem.

database activity
See activity.

database administrator (DBA)
A person who is responsible for the design, development, operation, maintenance, and use of a database.

database agent
A representation of the physical process or thread that does the work inside the database engine.

database alias

  1. A short name used to identify the parameters required to connect to a specific database.
  2. The name of the target server if it is different from the location name. The database alias is used to provide the name of the database server as it is known to the network. See also alias.

database as a service (DaaS)
A database that is hosted in the cloud. The database is installed and maintained by the service provider and operates on a pay per usage basis.

database authority
An authority that authorizes the possessor to perform database-level tasks, such as connecting to the database or creating packages in the database. See also authority level, authorization.

database backup series
One full backup of the database, plus up to 32 incremental backups made since that full backup. Each full backup that is run starts a new database backup series. A number identifies each backup series. See also database snapshot, full backup.

database cache
A section of memory on a Domino server where databases are stored for quick access. Administrators can display cache statistics, change the number of databases that a server can hold in its cache, close all databases in the cache, and disable the cache.

database catalog
A database containing information about databases stored on a single Domino server, a group of servers, or all the servers in a domain. Database catalogs are commonly used to let users add the databases in them to the user's desktop.

database cleanup
The act of deleting from a database those records for which the cleanup period has expired.

database client
A workstation used to access a database that is on a database server.

database configuration file
The configuration file for an individual database. See also configuration file.

database configuration parameter
A parameter whose value limits the system resources that a database can use. See also configuration parameter.

Database Connection Services directory (DCS directory)
A directory that contains entries for remote host databases and the corresponding application requester used to access them.

Database Control (DBCTL)
An environment that allows full-function databases and data entry databases (DEDBs) to be accessed from one or more transaction management subsystems.

database control environment (DBCTL environment)
The IMS DB/DC environment without the message handling and queue management capabilities.

database/data communication (DB/DC)
Program products that provide a method to separate the designer and programmer from the physical aspects and constraints of data storage and the physical characteristics of the terminal network, so that maximum effort can be placed on the applications.

database data set (DBDS)
A data set that contains some or all of the database records that are stored in a full-function database. Other types of data sets that are used in IMS databases include Fast Path area data sets, HALDB indirect list data sets, and HALDB primary index data sets.

database data source
A data source that fills ODM scenarios with data retrieved from an external database.

database description (DBD)
The collection of macro parameter statements that define the characteristics of a database, such as the database's organization and access method, the segments and fields in a database record, and the relationship between types of segments.

database description generation (DBDGEN)
The process by which a database description (DBD) is created.

database descriptor (DBD)
An internal representation of a DB2 for z/OS database definition, which reflects the data definition that is in the DB2 for z/OS catalog. The objects that are defined in a database descriptor are table spaces, tables, indexes, index spaces, relationships, check constraints, and triggers. A DBD also contains information about accessing tables in the database.

database directory
A directory that contains database access information for all databases to which a client can connect.

database engine
The part of the database manager that provides the base functions and configuration files that are needed to use the database.

database event listener
A service that listens for incoming messages from an SQL database data source and then triggers policies based on the incoming message data.

database event reader
An event reader that monitors an SQL database event source for new and modified events and triggers policies based on the event information. See also event reader.

database exception status
In a data sharing environment, an indication that something is wrong with a database.

database extension
A group of built-in database objects and supporting code that extends an Informix database server to manage specialized data or add new features. For example, the basic text search database extension enables searching for words and phrases in a document repository stored in a column of a table. See also DataBlade module.

database file

  1. In Lotus Notes, a file with the extension NSF that contains the data for an application. Its structure is composed of forms, fields, folders, views, and other presentation features, such as a navigator and a database icon.
  2. One of several types of the system object type *FILE kept in the system that contains descriptions of how input data is to be presented to a program from internal storage and how output data is to be presented to internal storage from a program.

database filter layer
A layer in the security plan that defines specific settings for database members down to the cell level.

database global variable
A global variable whose value is shared across all sessions in a database. See also built-in global variable, global variable, session global variable, user-defined global variable.

database header
An internal structure that stores database-wide information such as a time stamp that indicates when a database was first created or when the Fixup task last ran on it.

database ID
See database identifier.

database identifier (database ID)

  1. The time stamp that is located in the Notes database header and that indicates when a Notes database was first created or when the Fixup task last ran on it.
  2. An internal identifier of the database.

database instance
See database manager instance.

database instance ID (DBIID)
A value that is located in the Notes database header and that associates the database with specific entries in the transaction log.

database integrity
The protection of data items in a database while they are available to any application program. This protection includes the isolation of effects of concurrent updates to a database by two or more application programs.

database leaf object
A terminal object or node in a database hierarchy.

database-level sharing
A kind of data sharing that enables application programs in one IMS to read data while another program in another IMS reads from the same database or updates it. See also block-level sharing.

database-level tracking
In an RSR environment, a tracking subsystem that tracks the active subsystem's databases or areas. See also recovery-level tracking.

database library
A database that lists database links and uses replication ID numbers to locate databases on various servers. For example, a corporate database library might contain databases that deal with corporate policies and procedures.

database log
A set of primary and secondary log files consisting of log records that record all changes to a database. The database log is used to roll back changes for units of work that are not committed and to recover a database to a consistent state.

database-managed space table space (DMS table space)
A table space whose storage space is managed by the database manager. See also system-managed space table space.

database management batch (DBB)
One of two batch regions (the other being a DL/I batch region). DBB is an execution parameter. DBB batch jobs contain JCL DD statements for the ACB library.

database management system (DBMS)

  1. A software system that controls the creation, organization, and modification of a database and the access to the data that is stored within it.
  2. See database manager.

database management system driver (DBMS driver)
Software that provides access to data in a specific type of database. Some examples of drivers are Oracle SQL*Net and various ODBC drivers.

database manager

  1. A program that manages data by providing centralized control, data independence, and complex physical structures for efficient access, integrity, recovery, concurrency control, privacy, and security. See also data server.
  2. A person with Manager access to a Notes database, whose responsibilities include setting up and maintaining access to the database and monitoring database replication, usage, and size.

database manager configuration file
The configuration file for a DB2 instance. See also configuration file.

database manager configuration parameter
A configuration parameter whose value is set when an instance is created. Most database manager configuration parameters affect the amount of system resources that is allocated to a single instance of the database manager, or they configure the setup of the database manager and the different communications subsystems based on environmental considerations.

database manager instance
A logical database manager environment that consists of configuration files, directories, and a set of authorized users.

database monitor (DB monitor)
See IMS monitor.

database name
An identifier that designates a database. A database name must be unique within the location in which it is cataloged. See also alias, server name.

database node
See database partition.

database object

  1. An object that a user creates in the database, such as a procedure, trigger, or any other object that can be created by issuing a CREATE statement.
  2. An object that exists in an installation of a database system, such as an instance, a database, a database partition group, a buffer pool, a table, or an index. See also object.

database partition
A portion of the database that contains user data and indexes. There can be multiple database partitions in a partitioned database environment. See also data partition, database partition group, database partitioning, distribution key, table-partitioning key.

database partition group
A named subset of database partitions that is grouped together with a common distribution map. All table spaces that are created under the same database partition group have data on the same set of database partitions. See also database partition.

database partitioning

  1. A data organization scheme in which table data is divided across multiple database partitions based on the hash values in one or more distribution key columns of the table and based on the use of a distribution map of the database partitions. Data from a given table is distributed based on the specifications that are provided in the DISTRIBUTE BY clause of the CREATE TABLE statement. See also data partition, database partition, massively parallel processing, table partitioning.
  2. A portion of the database that contains user data and indexes. There can be multiple database partitions in a partitioned database environment.

database position
A program's place in the database after a DL/I call. IMS keeps track of the program's position in the database in order to process DL/I calls.

database program communication block (DB PCB)
The PCB that describes an application program's interface to a database. One DB PCB is required for each database view that is used by the application program.

database query tool
Any utility that requests information from a database, based on specific conditions.

database record
In an IMS database, a collection of segments that contains one occurrence of the root segment type and all of its dependents arranged in a hierarchic sequence. A database record can be a physical database record or a logical database record. See also logical database record, physical database record.

database recovery
The process of restoring data by merging the backup copy with changes accumulated since the backup was made.

Database Recovery Control (DBRC)
A feature of the IMS Database Manager that facilitates easier recovery of IMS databases. DBRC maintains information that is required for database recoveries, generates recovery control statements, verifies recovery input, maintains a separate change log for database data sets, and supports sharing of IMS databases and areas by multiple IMS subsystems.

database recovery log
See database log.

database reference field
In the Data Description Specifications Design Utility (DSU), a field in a data description specifications (DDS) source file that is created by referring to the description of an existing field in a database file.

database reorganization
The process of unloading and reloading a database to optimize physical segment adjacency or to modify the database description (DBD).

database replica
A special copy of a Notes database that, because it shares a replica ID with the original database, can exchange information with it through replication.

database request
See request.

database request module (DBRM)
A data set member that is created by the DB2 for z/OS precompiler and that contains information about SQL statements. DBRMs are used in the bind process.

database resource adapter (DRA)

  1. Component of the CICS-DBCTL interface in the CICS address space. Its functions include requesting connection and disconnection from DBCTL, telling CICS when a shutdown of DBCTL has been requested or if DBCTL has failed, managing threads, establishing contact with the DBCTL address space, and loading the DRA startup parameter table.
  2. An interface to IMS DB full-function databases and DEDBs. The DRA can be used by a coordinator controller (CCTL) or a z/OS application program that uses the ODBA interface.

database schema
See schema.

database security administrator
A person who has the authority to implement and maintain label-based access control.

database segment
The unit of access; the smallest amount of data that can be transferred by one IMS operation.

database server

  1. A software program that uses a database manager to provide database services to other software programs or computers. See also database.
  2. The server on which the database application and database are installed.

database server instance
A logical database server environment that consists of configuration files, directories, and a set of authorized users.

database server node
In a single system image (SSI), a DirectTalk system that contains the DirectTalk DB2 database. This is usually the same node as the voice server node.

database service
A service that provides the storage and retrieval of data in a database.

database set
One or more user databases and the schema repository that stores the schema they all use.

database snapshot
A complete backup of the entire database to media that can be taken off-site. When a database snapshot is created, the current database backup series is not interrupted. A database snapshot cannot have incremental database backups associated with it. See also database backup series, full backup.

database storage area
A content storage area that retains document content in a database engine. The database storage area also retains all objects contained in the object store, such as class definition, property definition, containment, storage policy, and queue events. See also content storage area.

database system monitor
A collection of APIs that gathers information regarding the state of the database system at the instance, database, and application levels. This information is stored in data elements, which can be examined by taking point-in-time snapshots or by using the event monitor to log system activity over time.

data bean
A type of bean that is placed in a JSP file. Data beans can have associated commands that are invoked when the JSP file instantiates the data bean at run time.

data binding

  1. A component that converts protocol-specific local data to and from a business object.
  2. A mapping between data in one system, such as IMS, to another, such as Java data objects.
  3. A process that allows the user to represent some form of data as an object in memory.

DataBlade module
A package of database objects and supporting code that extends an Informix database server to manage new kinds of data or add new features. A DataBlade module can include new data types, routines, casts, aggregates, access methods, SQL code, and client code. See also database extension.

data boutique
A decision support database that resides on a personal computer hard disk drive that can be shared by users.

data bus
A computer facility used to transfer data among processing units, storage, or peripheral devices.

data cache

  1. A buffer in memory that holds data blocks.
  2. A cache for providing data to the processor faster than it can be obtained from RAM.

Data Cache Manager
A component of CICSPlex SM that manages logical cache storage for use by other CICSPlex SM components.

data cache unit (DCU)
A high-speed buffer storage that contains frequently accessed instructions and data to reduce access time.

data capture

  1. In Sterling Order Management, the process of using attribute values that are input by the user as the basis for Greex rule processing for validation rules.
  2. The process of collecting and automatically interpreting data.

data carrier detect (DCD)
A signal defined in the EIA-232 standard that indicates to the data terminal equipment (DTE) that it is receiving a signal from the remote data circuit-terminating equipment (DCE).

data catalog
A collection of models representing objects, such as business items and notifications, to be used as inputs and outputs in process modeling.

data category group
A group whose members have access to a specific category of data, for example, medical and public health data, or environmental data. Membership of a data category group is assigned to give a user the appropriate level of access to data. Each user is added as a member of the appropriate group or groups.

data center

  1. A centralized repository of data and information relating to a particular field of knowledge. See also green data center.
  2. The physical location of the servers that provide cloud services. 
  3. A secure, limited-access room that contains hardware and communications equipment to serve the internal network.
  4. In a virtualized environment, a container that holds hosts, clusters, networks, and data stores.

data center asset
A logical or physical resource in a data center. Examples include servers, switches, load balancers, software, VLANs, security policies, and service level agreements.

data center device
See data center asset.

data center drop
A power cable that drops from an overhead cable management pathway and connects to the main power input plugs of the hardware components.

data center fragment (DCF)
A list of data center model objects required to support an application deployment template. It is a subset of the data center model.

data center model (DCM)
A centralized repository, containing physical and logical assets, that Tivoli Intelligent Orchestrator manages, and their relationships. The data center model tracks data center devices, their configuration, and associated allocations to applications.

data chaining
An SNA protocol for transmitting a group of related messages.

data change publication
A notice that is published by a supplier to its retailers through the Global Registry, that indicates item changes that have been made to synchronized data of record.

data channel
See input/output channel.

data character set
See character set.

data check

  1. A synchronous or asynchronous indication of a condition caused by invalid data or incorrect positioning of data. Some data checks can be suppressed.
  2. An operation used to verify data quality or data integrity.

data circuit
A pair of associated transmit and receive channels that provide a means of two-way data communication. See also physical circuit, virtual circuit.

data circuit-terminating equipment (DCE)
The equipment that provides signal conversion and coding between the data terminal equipment (DTE) and the line. The DCE provides all the functions required to establish, maintain, and end a connection.

data class

  1. A group of data categories.
  2. An access bean that provides data storage and access methods for caching enterprise bean properties. Unlike copy helpers, data class access beans work with enterprise beans that have local client views as well as remote client views.
  3. In information analysis, a classification that designates the logical type of data in a data field. A data class categorizes a column according to how the data in the column is used. For example, the classification INDICATOR represents a binary value such as TRUE/FALSE or YES/NO.
  4. A named list of allocation and space attributes that the system uses when creating a data set. The storage administrator uses the Interactive Storage Management Facility (ISMF) to define data classes, but the affected data sets are not required to be managed by the storage management subsystem (SMS). See also storage construct.

data clause
In COBOL, a clause in a data description entry in the Data Division that describes a particular characteristic of a data item.

data cleansing
The process of detecting, correcting, or removing incomplete, inaccurate, and irrelevant parts of data. The process of fixing the data involves standardizing, matching, and deduplicating data such that it conforms to organizational requirements prior to using it within a data warehouse.

data click activity
An action that simplifies a data integration task, such as the delivery of information from source to target data sources. One example of a data click activity is defining offload requests.

data code page
In Network File System (NFS), a list of the data name components of the files that are exported to and mounted on the specified NFS client or netgroup.

data collection

  1. The process of obtaining performance and availability monitoring data and providing that data to a metric evaluator. Examples of data collectors include Domain Name System (DNS) probes, web page analyzers, or database analyzers. See also discovery.
  2. Input data.
  3. The process of collecting data from one or more sources, cleansing and transforming it, and then loading it into a database.

data collection application
An Interactive Storage Management Facility (ISMF) application that allows the storage administrator interactively to submit IDCAMS DCOLLECT background jobs or to save job control language (JCL) for later use.

Data Collection Data Model
A series of COM components and interfaces that allow an OLE DB consumer to access data that is stored in a standard database or in a proprietary format. The consumer accesses the data source through a data source component that is specific to a particular kind of data source. Case data is accessed by using the Case Data Model (CDM), and metadata is accessed through the Metadata Model (MDM).

Data Collector plug-in
The monitoring component that records the transaction data.

data column
A vertical arrangement of identical data items that is used on list panels to display an attribute, characteristic, or value of one or more objects.

data communication
Transfer of data among functional units by means of data transmission protocols.

data communication program communication block (DC-PCB)
See telecommunication program PCB.

Data Communications Control (DCCTL)
A subsystem that allows IMS TM to act as a stand-alone, full-function transaction manager that can connect to DB2 or other external subsystems.

data component

  1. The part of a Virtual Storage Access Method (VSAM) data set, alternate index, or catalog that contains the object's data records.
  2. A component that holds data and test data to determine whether the data meets the criteria that is being evaluated in the logic flow. There are different types of data components, such as containers, qualifiers, spikes, and trends.

data compression

  1. The reduction of data volume on the media that occurs when performing save operations.
  2. See compression.
  3. The process of eliminating gaps, empty fields, redundancies, and unnecessary data to shorten the length of records or blocks.

data confidentiality
A function of the system that prevents unauthorized disclosure of data.

data connection
A connection to a repository of data (for example, a DB2 database) with which the runtime server can retrieve data in order to enhance the event being processed.

data connection resource (DCR)
A design element that is used to define a connection between a Notes form and an enterprise database for exchanging data.

data consistency

  1. The state of data that is valid, accurate and up-to-date across systems and data centers. In Global Mailbox, a high degree of consistency comes at the cost of performance.
  2. A characteristic of the data at the target site where dependent write order is maintained to guarantee the recoverability of applications.

data consumer
In Performance Toolbox, a description of a program that receives statistics over the network from the xmservd daemon and prints, post-processes, or otherwise manipulates the raw statistics. See also data supplier.

data container
A named area of storage, maintained by BTS, and used to pass data between activities, or between different invocations of the same activity. Each data container is associated with an activity; it is identified by its name and by the activity for which it is a container. An activity can have any number of containers, as long as they all have different names.

data control block (DCB)
A control block used by access method routines in storing and retrieving data.

Data Control Language (DCL)
A set of commands with which a user requests information about a database.

data conversion

  1. The process of changing data from one form of representation to another.
  2. The process of changing from one coded character set identifier (CCSID) to another. A system does data conversion when exchanging data with another system that is using a different CCSID.

data-conversion interface (DCI)
The IBM MQ interface to which customer-written or vendor-written programs that convert application data between different machine encodings and CCSIDs must conform.

data-conversion service
A service that converts application data to the character set and encoding that are required by applications on other platforms.

data correlation
A process by which the response received in a previous request is taken as the input data for the next request. See also dynamic data, substitution rule.

data country code (DCC)
A 3-digit code, unique to each country or region, that specifies the X.21 call format used by a network in its International Data Number to call another station. See also data network identification code.

data currency
The state in which data that is retrieved into a host variable in a program is a copy of data in the base table.

data decomposition
A method of breaking up (or decomposing) a program into smaller parts to take advantage of parallelism. Data decomposition divides the data (usually arrays) into smaller parts, each of which is operated on independently. See also functional decomposition.

data decompression
Reconstruction of data from a compressed format when performing a restore operation.

data deduplication
A method of reducing storage needs by eliminating redundant data. Only one instance of the data is retained on storage media. Other instances of the same data are replaced with a pointer to the retained instance. See also data enrichment, delta encoding, encryption, inline data deduplication, matching, one-source matching, postprocess data deduplication, survivorship.

data definition

  1. In IDDU, information that describes the contents and characteristics of a field, record, or file.
  2. A program statement that describes the features of, specifies relationships of, or establishes the context of data. A data definition reserves storage and can provide an initial value.
  3. A data object that defines a database or table.
  4. The origin of a field that references a data domain and determines the data type and the format of data entry. Data definitions are referenced by line definitions and may be system data definitions or user-defined data definitions.

data definition format (DDF)
An IBM format that contains an XML-formatted description of the input or output side of a map.

Data Definition Language (DDL)
A language for describing data and its relationships in a database. See also Data Manipulation Language, relational database management system.

data definition name (ddname)
The name of a data definition (DD) statement that corresponds to a data control block that contains the same name.

data definition statement

  1. A subset of SQL statements that can be used to create, alter, drop, and rename data objects, including databases, tables, views, synonyms, triggers, sequences, and user-defined routines. See also declaration statement.
  2. A job control statement that is used to define a data set for use by a batch job step, started task or job, or an online user.

data-dependent pagination
The process that is used when applications need to access part of a DB2 result set that is based on a logical key value.

data description
For data objects that are not self-describing, components of the data object that describe the data so that it may be processed.

data description entry
In COBOL, an entry in the Data Division that describes the characteristics of a data item.

Data Description Language
See Data Definition Language.

data description specifications (DDS)
A fixed format for describing and creating IBM i databases or device files.

Data Description Specifications Design Utility (DSU)
A feature of the CoOperative Development Environment/400 licensed program that helps users develop and create display files, printer files, and database files.

data diagram
A graphical representation of a relational data model, showing the model’s tables, columns, and the primary key-foreign key relationships between tables.

data diagram editor
A graphical editor used in the Decision Optimization Center IDE to create a data model’s tables, columns, and the primary key-foreign key relationships between tables.

data dictionary

  1. A set of tables that keep track of the structure of both the database and the inventory of database objects.
  2. In IDDU, an object for storing field, record format, and file definitions. The system-recognized identifier for the object type is *DTADCT.
  3. A repository of information about an organization's application programs, databases, logical data models, users, and authorizations.

data direction restriction
In Sterling Connect:Direct for z/OS, a security feature that enables the enforcement of more restrictive security parameters on nodes in a network by specifying whether each adjacent node can initiate a RECEIVE, SEND, or RECEIVE and SEND to or from the local node in the network map. See also trusted node security.

data directory
A directory that contains local Notes databases, local database templates, country language services (CLS) files, and configuration files.

data distribution
A mapping of the data values within a column into a set of categories that are equivalent to a histogram or to a frequency distribution. See also query optimizer.

data division
One of the four main parts of a COBOL program. The data division describes the files to be used in the program and the records contained within the files. It also describes any internal working storage records that are needed.

data domain
A characteristic of a field. A data domain specifies a data type and applies the minimum and maximum values allowed and other constraints.

data-driven relationship
A relationship where the parent table is related to one of several child tables, based on data in a particular column. See also explicit relationship, generic relationship.

data-driven stub
A stub that is driven by the contents of a data source.

data driven testing
A scripting technique that stores test input and expected results in a table or spreadsheet, so that a single control script can execute all of the tests in the table. Data driven testing is often used to support the application of test execution tools such as capture/playback tools. (ISTQB) See also keyword driven testing.

data dump
In COBOL, the contents of the data areas used by a program that has failed.

data element

  1. An entity in an OPL model that represents input data as well as the result of declarative calculations. See also variable.
  2. The smallest unit of data in an electronic data interchange. A sender ID and a receiver ID are examples of data elements.
  3. A unit of storage in a coupling facility list structure that makes up a data entry.
  4. A unit of data that cannot be divided. An example is the data element "age of a person" with values consisting of all 3-decimal digit combinations.
  5. The smallest unit of data that can be referred to.
  6. See monitor element.

data element separator
The character that is placed before each data element in a segment to mark the beginning of that data element, to identify where one variable-length data element ends and another begins.

data-encrypting key
A key that is used to encipher, decipher, or authenticate data. See also key-encrypting key, session cryptography key.

Data Encryption Algorithm

  1. In computer security, a 64-bit block cipher that uses a 64-bit key, of which 56 bits are used to control the cryptographic process and 8 bits are used for parity checking to ensure that the key is transmitted properly.
  2. In Cryptographic Support, the equivalent to the Data Encryption Standard.

Data Encryption Standard (DES)
A cryptographic algorithm designed to encrypt and decrypt data using a private key. See also Triple Data Encryption Algorithm.

data engineer
A software engineer who gathers, collects, aggregates, processes, and manages data in large sets. A data engineer develops, maintains, and evaluates big data solutions and database systems and prepares data for analysis by data scientists.

data enrichment
The process of adding and correcting the values of records from records that have been identified as representing similar entities. See also data deduplication, deduplication.

data entry

  1. The entry of characters into a computer system for processing, usually in predefined fields that are controlled by an application. See also text entry.
  2. A catalog entry that describes the data component of a cluster, alternate index, page spaces, or catalog. A data entry contains the data component's attributes, allocation and extent information, and statistics. A data entry for a cluster's or catalog's data component can also contain the data component's passwords and protection attributes.
  3. Part of a coupling facility list structure list entry that is used to hold user-specified data.

data entry database (DEDB)
A direct-access database that consists of one or more areas, with each area containing both root segments and dependent segments. DEDBs use a data structure that allows them to be used for both hierarchic processing and journaling. The database is accessed by using the VSAM Media Manager. See also Fast Path, sequential dependent segment.

data entry notation
Information that is printed in a paper questionnaire to help data entry personnel enter the respondents' answers correctly. This notation can be for card column-based data entry or for variable-based data entry.

data entry panel
An interface with which the user communicates with the system by completing one or more fields.

data event control block
A control supplied by an application program to represent a read or write request for the basic direct access method (BDAM), basic partitioned access method (BPAM), or basic sequential access method (BSAM).

Data Exchange (DATEX)
A set of specifications for exchanging traffic information in a standard format between disparate systems. It is aimed at harmonizing the exchange of traffic and travel information at all levels applicable to road operators (non-urban and urban) and service providers. It facilitates the electronic exchange of traffic and travel related data between traffic centers including cross border exchange.

data exchange
A feature that enables the import of hardfacts from external systems in the application.

Data Exchange SPI architecture (DESPI)
The interface that resource adapters and runtime components use to exchange business object data. The Data Exchange SPI architecture, which is based on the concept of cursors and accessors, abstracts the data type so that an adapter can be written only once and then work on runtime environments that support different data types, such as data objects and JavaBeans.

data exploration
The first step in data analysis that typically involves summarizing the main characteristics of a data set.

Data Export Wizard (DEW)
A tool that provides an easy mechanism to export data from within 2x into Microsoft Excel for ad hoc queries.

Data Facility Product (DFP)
A program that isolates applications from storage devices, storage management, and storage device hierarchy management.

Data Facility Sort (DFSORT)
An IBM licensed program that is a high-speed data-processing utility. DFSORT provides an efficient and flexible method for sorting, merging, and copying operations, as well as providing versatile data manipulation at the record, field, and bit level.

Data Facility Storage Management Subsystem (DFSMS)
An operating environment that helps automate and centralize the management of storage. To manage storage, the storage management subsystem (SMS) provides the storage administrator with control over data class, storage class, management class, storage group, and automatic class selection (ACS) routine definitions.

data feed
A data format that contains periodically updated content that is available to multiple users, applications, or both.

data field

  1. A user-defined workflow field.
  2. A column or field that contains a specific set of data values that are common to all records in a file or table.
  3. The optional third field of a count-key-data (CKD) record. The data field contains data that the program writes. The count field specifies the length of the data field.

See container.

data file

  1. In RJE, a remote job input stream that can contain host system commands and job control language as well as data.
  2. A group of related data records organized in a specific order. A data file can be created by the specification of FILETYPE(*DATA) on the create commands. See also command file, source file.
  3. A file that stores data for use by an application or system.
  4. A flat file containing data to be loaded into the database.
  5. The information asset that represents a collection of fields that are stored in a single file, such as a flat file, a complex flat file, or a sequential file. See also data set.
  6. A file that stores a collection of fields in a native system file instead of in a database table.

data file structure
A collection of fields.

data file utility (DFU)
The part of the Application Development ToolSet feature that is used to enter, maintain, and display records in a database file.

data filter
A configurable feature that allows users to specify data access restrictions in IBM Marketing Software products. Data filters make it possible to restrict the customer data that a user can view and work with.

data flow

  1. A graphical model that defines activities that extract data from flat files or relational tables, transform the data, and load it into a data warehouse, data mart, or staging table.
  2. The transfer of data between constants, variables, and files by running statements, procedures, modules, or programs.

data flow control
In SNA, a request/response unit (RU) category used for requests and responses exchanged between the data flow control layer in one half-session and the data flow control layer in the session partner.

data flow control layer (DFC layer)
In SNA, the layer within a half-session that (a) controls whether the half-session can send or receive, or both send and receive request units (RUs) at the same time, (b) combines related RUs into RU chains, (c) defines the limits of transactions by using the bracket protocol, (d) controls the connection of requests and responses in accordance with control modes specified when the session is started, (e) creates sequence numbers, and (f) associates requests with responses.

data flow control protocol
In SNA, the sequencing rules for requests and responses by which network addressable units (NAUs) in a session coordinate and control data transfer and other operations, for example, bracket protocol.

data flow graph
A representation of the set of operators and the streams that connect them within a streams processing application. See also composite operator, main composite operator, operator, stream, subgraph.

data flow synchronous response
In VTAM, a normal-flow response that is treated as a normal-flow request so that it may be received in sequence with normal-flow requests.

data format
A description of the application data for a particular transaction. An application data format is composed of data structures and fields.

data frame
A rectangular division of computer output on microfilm.


  1. A self-contained packet, independent of other packets, that carries information sufficient for routing from the originating data terminal equipment (DTE) to the destination DTE without relying on earlier exchanges between the DTEs and the network.
  2. A form of asynchronous messaging in which an application sends a message, but does not require a response. See also request/reply.

Datagram Delivery Protocol (DDP)
In AppleTalk networks, a protocol that provides network connectivity by means of connectionless socket-to-socket delivery service on the internet layer.

datagram protocol
In Distributed Computing Environment (DCE) Remote Procedure Call (RPC), a datagram-based transport protocol, such as User Datagram Protocol (UDP), that provides a connectionless transport layer.

datagram segment
A part of a datagram that is transported through a network separately from other parts of the same datagram. A datagram can be segmented if it contains too many bytes of data to send at one time.

data graph
A set of Service Data Objects (SDO) interconnected with relationships.

data grid

  1. A system of data that dynamically caches, partitions, replicates, and manages application data and business logic across multiple servers.
  2. The cache memory that is used instead of a database for quicker access to data during operations.

data group

  1. In the GDDM function, a collection of data values displayed, for example, as a pie chart or as the plotted points on a line of a line chart. More than one data group may be displayed on a chart.
  2. In Business Graphics Utility, a collection of values that identify the comparisons in a chart. For example, the relative size of the slices in a pie chart or the relative height of the bars in a bar chart. See also data value.

data handler
A Java class or library of classes that a process uses to transform data into and from specific formats. In the business integration environment, data handlers transform text data of specified formats into business objects, and transform business objects into text data of specified formats.

data hierarchy
In COBOL, the relationship between a group item or record and the group data items and elementary data items that make it up.

data host

  1. See data host node.
  2. The logical partition that hosts one or more database partitions in a partitioned database environment.

data host node
In a communication management configuration, a type 5 host node that is dedicated to processing applications, and does not control network resources, except for its channel-attached or communication adapter-attached devices. See also communication management configuration host node.

data independence
The concept of separating the definitions of logical and physical data such that application programs do not depend on where or how physical units of data are stored; the reduction of application program modification in data storage structure and access strategy.

data in motion
The process of analyzing data on the fly without storing it.

Data Insight Tool
A module that is used by Talent Acquistition clients to run reports related to candidates and requisitions.

data integrity

  1. The condition that exists as long as accidental or intentional destruction, alteration, or loss of data does not occur.
  2. The security service that detects whether there has been unauthorized modification of data, or tampering. The service detects only whether data has been modified; it does not restore data to its original state if it has been modified.

data integrity statement
A subset of SQL statements that can be used to control transactions and audits. Data integrity statements also include statements for repairing and recovering tables.

data interchange

  1. The sharing of data between applications.
  2. The use of data by systems of different manufacture.

data interchange block (DIB)
A block created by the CICS data interchange program (DIP) to control input and output to SNA batch devices. The DIB is chained to the appropriate TCTTE for the batch device, and is released at the termination of the transaction.

data interchange format (DIF)
In System i Access, a format that presents data in rows and columns.

data interchange program (DIP)
A CICS program that communicates with batch data interchange terminals, such as the 3790, for bulk transfer of dumps, data sets, and so on.

data interval
A time period in minutes for the summary data record. See also summary data.

data in transit
The update data on application, system, direct access storage device (DASD) volumes that is being sent to the recovery system to be written to DASD volumes on the recovery system.

data item

  1. Self-contained data messages that can be sent or processed by all components.
  2. In EGL, an area of memory that is not in a structure and is based either on a data item part or on an explicit primitive-type description such as CHAR(3).
  3. In COBOL, a character or a set of consecutive characters (excluding literals in either case) defined as a unit of data by the COBOL program.
  4. A unit of information to be processed.
  5. In the MQAI, an integer or character-string item that is contained within a data bag. A data item can be either a user item or a system item.

data label
In Business Graphics Utility and the GDDM function, a text string that describes a set of data values. Data labels are used with bar charts, pie charts, and Venn diagrams.

data lake
A large-scale data storage repository and processing engine.

Data Language/I (DL/I)
The IMS data manipulation language, which is a common high-level interface between a user application and IMS. DL/I calls are invoked from application programs that are written in languages such as Java, PL/I, COBOL, VS Pascal, C, and Ada. DL/I can also be invoked from assembler language application programs by subroutine calls. IMS lets the user define data structures, relate structures to the application, load structures, and reorganize structures.

dataless client
A workstation without local file systems or local boot images that accesses some of its resources remotely. Dataless clients use a local disk used for paging and dump devices.

data line

  1. In the GDDM function, a line drawn parallel to a chart axis, through a specified value along the other axis.
  2. In Business Graphics Utility, a straight line drawn from either axis that shows the exact data values on the chart.

data lineage
The lifecycle of a unit of data, such as a table or a column, that indicates where the data comes from and how the data changes as it moves between persistent and transient data stores of any type. Lineage is often expressed as a graph of that data flow. Data lineage is most often used for ETL jobs. See also business lineage.

A field in a database file that contains a link to an object. The link is in the form of a uniform resource locator (URL).

data link

  1. The physical connection (communications lines, modems, controller, work stations, other communications equipment), and the rules (protocols) for sending and receiving data between two or more locations in a data network.
  2. See link.

data link connection identifier (DLCI)

  1. The field in a Q.922 frame that is used for frame relay routing. Each DLCI identifies a frame relay virtual circuit.
  2. The numeric identifier of a frame-relay subport or PVC segment in a frame-relay network. Each subport in a single frame-relay port has a unique DLCI.

data link control (DLC)
A set of rules used by nodes on a data link (such as an SDLC link or a token ring) to accomplish an orderly exchange of information.

data link control layer (DLC layer)
In communications, the layer that consists of the link stations that schedule data transfer over a link between two nodes and perform error control for the link. Examples of data link control are SDLC and HDLC.

Data Link Control protocol (DLC)
The protocol layer used by nodes on a data link to accomplish an orderly exchange of information.

data link escape character (DLE character)
In binary synchronous communication (BSC), a transmission control character used to indicate that the next character is a control character, not a data character.

DataLink File Manager
A system function that maintains the status of objects that are linked to a database file through a datalink.

data link layer
In the Open Systems Interconnection reference model, the layer that provides services to transfer data between entities in the network layer over a communication link. The data link layer detects and possibly corrects errors that may occur in the physical layer.

data link level
In the hierarchical structure of a data station, the conceptual level of control or processing logic between high level logic and the data link that maintains control of the data link. The data link level performs such functions as inserting transmit bits and deleting receive bits; interpreting address and control fields; generating, transmitting, and interpreting commands and responses; and computing and interpreting frame check sequences. See also packet level, physical level.

data link protocol

  1. In SNA, a set of rules for data communication over a data link in terms of a transmission code, a transmission mode, and control and recovery procedures.
  2. The rules that govern control of the physical connection for sending and receiving data between two or more locations in a network. Examples of data link protocols include (a) asynchronous, (b) binary synchronous communications (BSC), (c) Ethernet, (d) synchronous data link control (SDLC), (e) token-ring network, and (f) X.25. See also communications line.

Data Link Service (DLS)
See also called DLS user.

Data Link Service access point (DLSAP)
A point at which a Data Link Service (DLS) user attaches itself to a Data Link Service (DLS) provider to access data link services.

data link switching (DLSw)
A method of transporting network protocols that use an IEEE 802.2 logical link control (LLC) type 2. SNA and NetBIOS are examples of protocols that use LLC type 2. See also encapsulation.

data list
A memory-resident list of names that is constructed from an external data source. Search requests are performed against one or more data lists. See also regularization.

data loader
A component that reads data from, and writes data to, a persistent storage.

data load rule
An operation that is performed on data from an external data source file as it is loaded into a database.

data locale
A locale that governs the data manipulated or displayed by a program, which may be different than the UI locale. See also UI locale.

data lock

  1. The insurance of data availability to a single application program as a protection against conflicting updates to a data record.
  2. The system lock that locks data segment into memory.

Data Lookaside Facility
An MVS service that provides the capability for multiple jobs to share access to large data objects in storage. It enables QSAM and VSAM applications to minimize I/O operations.

data loss prevention (DLP)
A system or strategy that is implemented to monitor sensitive data and detect and block security breaches.

data mailslot
In Sterling B2B Collaboration Network, the division of a mailbox that receives and temporarily stores EDI or other types of data.

data management (DM)

  1. The part of the operating system that controls the storing and accessing of data to or from an application program. The data can be on internal storage (for example, database), on external media (diskette, tape, or printer), or on another system.
  2. The task of systematically identifying, organizing, storing, and cataloging data in an operating system.

data management application program interface (DMAPI)
The interfaces defined by the Open Group's Data Storage Management (XDSM) specification. These interfaces support the monitoring of events on files and the management and maintenance of the data in a file.

data management block (DMB)
An IMS control block in main storage that describes and controls a physical database. A DMB is constructed from information that is obtained from the ACB library or the DBD library.

data management group
An object within a data management zone that contains data management services and data access models that are related to each other.

Data Management Object Model (DMOM)
A set of component objects that are designed specifically to facilitate data transformations.

data management service
An Optim component used to transform data as well as copy data between schemas.

Data Management Services
The DB2 component that controls creating, removing, maintaining, and accessing the tables and table data in a database.

data management zone
An object that contains one or more data management groups.

data manager
A feature that monitors the progress of batch operation jobs such as optimization, import, export, report generation, awarding, and more.

data manager server
A server that collects metadata information for client inventory and manages transactions for the storage agent over the local area network. The data manager server informs the storage agent with applicable library attributes and the target volume identifier.

Data Manipulation Language (DML)

  1. A subset of SQL statements that is used to manipulate data. SELECT, INSERT, UPDATE, DELETE, and MERGE are data manipulation language statements. See also Data Definition Language, Structured Query Language.
  2. A subset of SQL statements that is used to manipulate data. Most applications primarily use DML.

data manipulation statement
A subset of SQL statements that can be used to query tables, insert into tables, delete from tables, or update tables (select, insert, delete, update).

data map

  1. A set of conversion instructions that show the relationship between the data elements or fields in one standard and the equivalent fields or elements in another standard.
  2. A map that displays information about a data source and provides information about data source type, view options, data overlay, and details about data size and list of files.
  3. An internal object in a page definition that specifies fonts, page segments, fixed text, page size, and the placement and orientation of text.

data mapping

  1. The process of changing characters from one form of representation to another, such as from zoned decimal to packed decimal.
  2. A defined mapping between the data in a UMF file and the corresponding tables and table columns in the entity database. A data mapping must exist to successfully load data into the entity database.

data mapping template
A template used for mapping XML elements to relational table columns.

data map transmission subcase
An internal object that specifies the control information for printing line data. One data map transmission subcase must appear in each data map of a page definition.

data mart
A subset of a data warehouse that contains data that is tailored and optimized for the specific reporting needs of a department or team. A data mart can be a subset of a warehouse for an entire organization, such as data that is contained in online analytical processing (OLAP) tools.

data mart ETL
In Tivoli Enterprise Data Warehouse, the extract, transform, and load (ETL) process that extracts a subset of data from the central data warehouse, transforms it, and loads it into one or more star schemas. These schemas then can be included in data marts to answer specific business questions. See also central data warehouse ETL.

data mart model
See dimensional model.

data mask
In architecture, a sequence of bits that can be used to identify boundary alignment bits in image data.

data member
The smallest possible piece of complete data. Elements are composed of data members.

data message
In Q replication and event publishing, a message that contains all or part of a committed transaction that involves source tables, a committed operation on a single row in a source table (event publishing only), or all or part of a large object (LOB) value from a row operation within a transaction.

data migration

  1. The movement of data from one physical location to another without disruption of application I/O operations.
  2. The movement of data when the software is upgraded or the data is transferred to a different hardware server or model.

data mining
The process of collecting critical business information from a data source, correlating the information, and uncovering associations, patterns, and trends. See also predictive analytics.

data mode
In data communications, a time during which BSC is sending or receiving characters on the communications line.

data model

  1. A simple view of entities and their relationships that can be used by stubs to maintain information. A data model is similar to a relational database, where a data model entity is equivalent to a database table, an instance of an entity to a row in a table, and an attribute to a table column.
  2. A logical view of the organization of data in a database.
  3. A common model that facilitates reporting of all types of data from multiple data sources.
  4. An abstract representation of the business data and metadata used in an installation. A data model contains data sources, data types, links, and event sources. See also company.
  5. A template that is used to make a file plan object store compliant with certain records management standards. The data model can include metadata and security features.
  6. A database-specific model that represents relational data objects (for example, tables, columns, primary keys, and foreign keys) and their relationships. A data model can be used to generate DDL statements which can then be deployed to a database server.
  7. The objects, events, and key-value pairs that publish data to client applications.
  8. A model defining the structure of business artifacts that are operated upon by business operations.
  9. A description of the organization of data in a manner that reflects the information structure of an enterprise.

data modeling
A structured set of techniques for defining and recording business information requirements. It is a depiction of the user's view of the data needs of the organization in a consistent and rigorous fashion. The data model eventually serves as the basis for translation to computer system databases.

data model object
An abstract representation of a managed IT asset. Data model objects are used to create a data model of all managed IT assets.

data module
The part of the storage system rack that contains storage disks.

data movement operation
An operation that physically moves a row from one location to another location in a table. Examples of data movement operations are updating database partitioning keys and reorganizing tables.

Data Movement Service
A service that is used to run and schedule builds and job streams on remote computers.

data mover

  1. A device that moves data on behalf of the server. A network-attached storage (NAS) file server is a data mover.
  2. The program that copies data when a backup of the control data sets is being made.

data multiplexer
See multiplexed device.

data name
In COBOL, a user-defined word that names a data item. When used in the general formats, data name represents a word that cannot be subscripted, indexed, or qualified unless specifically permitted by the rules of that format. See also identifier.

data network
An arrangement of data circuits and switching facilities for establishing connections between data terminal equipment.

data network identification code (DNIC)
A 4-digit code that specifies the X.21 call format used by a network in its International Data Number to call another station. The first three numbers are the data country or region code, and the last number is the country or region network identifier. See also data country code.

data node
The server where the data host runs.

data note
A document in a Notes database.

data object

  1. An object that provides information about required activities. Data objects can represent one object or a collection of objects. See also shared managed object.
  2. A portion of data in a data stream that can be recognized as belonging to a specific type.
  3. An element of a data structure such as a file, an array, or an operand that is needed for the execution of an application.
  4. Any object (such as tables, views, indexes, functions, triggers, and packages) that can be created or manipulated using SQL statements. See also business object.
  5. The data that is stored in an R-tree indexed column of a table and in the R-tree index itself.
  6. A program variable that provides operational and possibly representational characteristics to byte strings in spaces.
  7. An object that conveys information, such as text, graphics, audio, or video. See also machine object.
  8. A piece of client data that is placed on the coupling facility by CQS as a result of a CQSPUT request or a CQSUPD request. From an IMS shared queues point of view, a data object contains one part or all of an IMS message or an entire EMH message. From an IMS Resource Manager point of view, a data object contains information about an IMS resource such as a transaction or a user.
  9. A collection of data referred to by a single name.
  10. An object that is either specified within a page or overlay or is identified as a resource using the Map Data Resource (MDR) structured field and later included in a page or overlay. Examples include: PDF single-page objects, encapsulated PostScript objects, and IOCA images.

data object filter
A control that allows the exclusion of data objects (such as tables and schemas) from the tree view of the database.

data object resource
An object container resource or IOCA image resource that is either printer resident or downloaded. Data object resources can be used to prepare for the presentation of a data object, such as with a resident color profile resource object, included in a page or overlay through the Include Object (IOB) structured field; for example, PDF single-page objects, encapsulated PostScript objects, and IOCA images, or invoked from within a data object; for example, PDF resource objects.

data of record
Data that is stored in the appropriate format for proper synchronization within a company and with its trading partners.

data origin authentication
The confirmation that data comes from the apparent originator.

data-owning region (DOR)
A CICS address space whose primary purpose is to manage files and databases. See also application-owning region, terminal-owning region.

data packet
In X.25 communications, a packet used for the transmission of user data on a virtual circuit at the DTE/DCE interface.

data parallelism
A situation in which parallel tasks perform the same computation on different sets of data.

data part
An EGL definition that specifies a data structure. The types of data parts are dataItem, dataTable, and record parts.

data partition

  1. A logical representation of a data slice that is managed by a specific SPU, and which contains the user data that the SPU is responsible for processing during queries.
  2. A set of table rows that is stored separately from other sets of rows. A data partition is grouped by the specifications that are provided in the PARTITION BY clause of the CREATE TABLE statement. See also database partition, database partitioning, table partitioning, table-partitioning key.
  3. A VSAM data set that is contained within a partitioned table space.

data-partitioned secondary index (DPSI)
A secondary index that is partitioned according to the underlying data. See also nonpartitioned secondary index.

data partitioning
The process of logically and/or physically partitioning data into segments that are more easily maintained or accessed.

Dataphone digital service (DDS)
The AT&T line service that allows the customer to transmit data on the line in a digital format.

A calculated value of a metric at a point in time.

data point

  1. A calculated value of a metric at a point in time.
  2. A name-value pair that represents a unit of business data or a point on a graph. On a graph, a data point is represented as a slice for pie plots, a bar for bar plots, or one point for line plots and area plots. See also data series, name-value pair.

data pointer
A pointer that provides addressability and scalar representational attributes to a byte string in a space.

data policy
The collection of protocols that governs Phase II negotiations.

data pollution
Inconsistent, incorrect, or intentionally misleading data entry in a data store.

data pool
A repository of data that allows trading partners to obtain, maintain and exchange information electronically and in a standard format.

data pool substitution
The act of replacing a value in a recorded test with variable test data that is stored in a data pool.

data privacy policy
A policy applied to XML or relational data that specifies how entities within a data source are to be masked for data privacy purposes. Data privacy policies mask data that is processed by a data management service.

data privacy template
An XSL template that contains a rule-based data privacy policy for an XML schema element or attribute. A data privacy template is included in an XSLT stylesheet associated with an XML schema model.

data project
One of the component projects that make up an Decision Optimization Center application. The data project contains the definition of the application data model, which is the model of the data that is manipulated by the ODM application.

data provider definition
A mapping of the logical column definitions in the application view to physical table columns in the data source. A data provider definition links source data directly to an application view and indirectly to enterprise view tables and columns. A single application view table may have more than one data provider definition, each of which may point to multiple data sources.

data pump
The combination of the disks that hold the data and the networking hardware and software required to deliver assets to clients.

data purger
A function that manages the database size by purging old data at regular intervals.

data quality
The extent to which data has been accurately coded and stored. Factors that adversely affect data quality include missing values, data entry errors, measurement errors, and coding inconsistencies.

data quality management (DQM)
A pipeline process that checks the data for required values, valid data types, and valid codes, and also corrects the data by providing default values, formatting numbers and dates, and adding new codes, if that was configured. Data quality management includes address hygiene and name standardization processing. See also address hygiene, DQM rule, name hygiene, name standardization, pipeline.

data queue
An object that is used to communicate and store data used by several programs in a job or between jobs. The system-recognized identifier is *DTAQ.

data rate
The rate at which data is transmitted or received from a device. Interactive applications tend to require a high data rate, while batch applications can usually tolerate lower data rates.

data record
A basic unit of data recording format. See also count key data, fixed-block architecture, index record, track.

data reference line
In the GDDM function, a data line that also acts as a shading boundary for the first data group of a surface chart, histogram, or composite bar chart, or for all the data groups of a multiple bar chart. If no data reference line is present, such data groups are shaded from the horizontal axis.

data registry
An entity that manages the synchronization of item data and associated processes within supply chains, through a central database that supports data verification and data change publications.

data replication
The process of maintaining a defined set of data in more than one location. Replication involves copying designated changes for one location (a source) to another (a target) and synchronizing the data in both locations.

data resource manager
A program that allows applications to read and change data. Changes are coordinated using a sync point manager.

data restart
The process of resending inbound data from a mailslot.

data restore
The process of replacing data after it has been removed from the mailslot.

data restriction
See constraint.

data rule
An expression that is generated out of a data rule definition that evaluates and analyzes conditions found during data profiling and data quality assessment. Data rules define specific tests, validations, or constraints associated with the data.

data schema
See schema.

data scientist
A person who investigates complex problems through expertise in disciplines within the fields of mathematics, statistics and computer science.

data security
The protection of data against unauthorized disclosure, transfer, modification, or destruction, whether accidental or intentional.

data security monitor (DSMON)
A RACF auditing tool that produces reports enabling an installation to verify its basic system integrity and data security controls.

data series
A set of data points. See also data point.

data server

  1. A server that provides services for the secure and efficient management of information. See also database manager.
  2. A device on a local area network (LAN) that provides services, data, or facilities for other devices on the network.

data server client
See IBM data server client.

Data Server Client
See IBM Data Server Client.

data server driver copy
See IBM data server driver copy.

Data Server Provider for .NET
See IBM Data Server Provider for .NET.

data service unit (DSU)
A device that provides a digital data service interface directly to the data terminal equipment. The DSU provides loop equalization, remote and local testing capabilities, and a standard EIA/CCITT interface. See also channel service unit.

data service unit/channel service unit (DSU/CSU)
A device used to connect a system to a digital communications line.

data set

  1. A collection of data, usually in the form of rows (records) and columns (fields) and contained in a file or database table. See also data file.
  2. A set of parallel data files and the descriptor file that refers to them. Data sets optimize the writing of data to disk by preserving the degree of partitioning.
  3. See file.
  4. A collection of interrelated transactional data.
  5. The major unit of data storage and retrieval, consisting of a collection of data in one of several prescribed arrangements and described by control information to which the system has access.

data set change indicator
A bit in the data set label that the system sets when the data set is opened for processing other than input.

data set collection
A group of data sets that are intended to be allocated on the same tape volume or set of tape volumes as a result of data set stacking.

data set concatenation
The allocation of two or more data sets such that the access method retrieves them as a single data set. The two types of data set concatenation are sequential and partitioned. See also partitioned concatenation, sequential concatenation.

data set control block (DSCB)
A control block in the volume table of contents (VTOC) that describes data sets.

data set definition
A Jazz model object that describes a data set on z/OS and is stored in the Rational Team Concert Jazz repository. If the data set already exists, the data set definition must specify just the data set name. If the data set is new, the data set definition must specify both the name of the data set, and the characteristics of the data set, such as record format. Every data set that a build process references must correspond to a data set definition.

data set deletion

  1. Removing a data set control block (DSCB) and releasing its space. A tape data set generally is considered to be deleted when its volume or volumes are made available for reuse or destruction. For both disk and tape, deletion generally also includes removing the data set's entry from the catalog DSCB.
  2. In DFSMShsm, the space management technique of deleting data sets, not managed by the storage management subsystem (SMS), that have not been used for a specified number of days and do not have expiration date protection.

data set forwarding
The dynamic replacement of the specifications of the checkpoint data set with new specifications.

data set group
An operating system data set that contains a subset of a database with one or more unique segment types. A database always consists of at least one data set group. See also primary data set group, secondary data set group.

data set header
A page in printed output that separates multiple data sets or multiple copies of a data set within a print job. See also header page, job header.

data set instance number
A number that indicates the data set that contains the data for an object.

data set label
Record that is used to identify data sets and contain information about those data sets.

data set mapping
An association between the lowest level qualifier in an MVS data set name and the file name extension used for the related workstation-based file.

data set member
A individual unit of data among a named collection of data.

data set name (dsname)
An identifier assigned to a data set.

data set name block (DSNAME block, DSNB)
An area that represents a physical VSAM data set that is being accessed through one or more CICS files.

data set name sharing
An MVS option that allows one set of control blocks to be used for the base and the path in a VSAM alternate index.

data set organization (DSORG)
The type of arrangement of data in a data set, such as sequential organization or partitioned organization.

data set pool
One or more volumes managed by DFSMShsm to which data sets that have migrated can be recalled, depending on the set of initial characters of the data set name.

data set prefix
An identifier that, together with the data set name (indicated in the data set definition), specifies a data set that is allocated to Rational Team Concert. A data set prefix can contain multiple segments, including a high-level qualifier (HLQ); for example, HLQ.PROD. With a prefix defined by a user, artifacts can be modified in isolation from other users.

data set profile
A profile that provides RACF protection for one or more data sets. The information in the profile can include data such as the profile owner, universal access authority, and access list. See also discrete profile, generic profile, profile.

data set ready (DSR)

  1. An interface that monitors the connection between a modem and a telephone circuit, which detects line failure and notifies a user of line drops.
  2. In the EIA 232 standard, a signal that indicates to the data terminal equipment (DTE) that the local data circuit-terminating equipment (DCE) is connected to the communication channel and is ready to receive data.

data set retirement
In DFSMShsm, the space management technique of deleting data sets, not managed by the storage management subsystem (SMS), that have not been referred to for a specified number of days and have a backup version.

data set separator page
A page of printed output that delimits data sets.

data set sequence number (DSSN)
A number, maintained by DBRC in the RECON data set, that counts when an application opens a database for update.

data set stacking
A function that places several data sets on the same tape volume or set of tape volumes. Data set stacking increases the efficiency of tape media usage and reduces the overall number of tape volumes needed by allocation. It also allows an installation to group related data sets on a minimum number of tape volumes, which is useful when sending data off-site.

data sharing
The ability of subsystems or application programs to access data directly and to change it while maintaining data integrity.

data sharing group
A collection of one or more systems that directly access and change the same data while maintaining data integrity.

data-sharing instance
See DB2 pureScale instance.

data sharing member

  1. A DB2 subsystem that belongs to a data sharing group.
  2. A local or remote relational or nonrelational data manager that can support data access using an ODBC driver that supports the ODBC APIs.

data sharing mode
An operational RACF mode that is available when RACF is enabled for sysplex communication. Data sharing mode requires installation of coupling facility hardware.

data sheet
A template that defines the specifications of an asset for the calibration process.

data skew
The uneven distribution of data values across logical or physical data storage media.

data slice
A logical representation of data that is saved on the partitions of a disk. The data slice contains segments of each user database and table.

See data source.

data source

  1. The physical connection to a data repository such as a relational database, an OLAP cube, or a Microsoft Excel file.
  2. An object that represents a repository of information. Although the repository is typically a file server, workstation, email server, or other electronic storage system (such as a content management system), it could be a filing cabinet or a box in a warehouse. Each data source can be associated with an application that knows how to access the data source's information the data can be stored in all or part of one or more physical servers.
  3. A relational database or XML file that contains data to be processed in a data management service.
  4. The source of data itself, such as a database or XML file, and the connection information necessary for accessing the data. See also integration adapter, mapping.
  5. An application, server, transaction, or other process from which raw data is gathered.
  6. The means by which an application accesses data from a database.
  7. Data that contains the identities that the user loads into the entity database. Data sources contain identifying data and non-identifying data. Examples of data sources include, but are not limited to, employee databases, watch lists, vendor lists, and customer lists.
  8. In JDBC, an interface that provides a logical representation of a pool of connections to a physical data source. Data source objects provide application portability by making it unnecessary to supply information specific to a particular database driver.
  9. The party that owns and provides master data to a community of trading partners to ensure synchronization between the source data and the data of record.
  10. An external source of data, for example, a database or a file, that can supply a wide variety of data in the required format.
  11. A storage resource or agent that provides data about a storage environment.
  12. A repository of data to which a federated server can connect and then retrieve data by using wrappers. A data source can contain relational databases, XML files, Excel spreadsheets, table-structured files, or other objects. In a federated system, data sources seem to be a single collective database.
  13. A local or remote data manager. In DB2 for z/OS, a data source must be capable of supporting data access through an ODBC, or JDBC driver that supports current APIs.

data source account

  1. See identity.
  2. See external ID.

data source adapter (DSA)
A component that allows the application to access data stored in an external source.

data source approver
A user who has the authority to approve the creation, modification, and deletion of a data source.

data source code
A user-defined identifier for the data source.

data source component (DSC)
A COM component that is used to expose data in the data source to the Data Model. Case data is exposed to the Provider by a case data source component (CDSC), and metadata is exposed to the metadata document object by a metadata source component (MDSC). If the data is not in a format that is supported by an existing data source component, a component must be created.

data source connection
The named information that defines the type of data source, its physical location, and any sign-on requirements. A data source can have more than one connection.

data source model
An object that contains a schema-based definition of entities within a data source. The two types of data source models are relational database models and XML schema models.

data source object
In a federated system, an object at a remote data source on which operations can be performed. Examples of data source objects are tables, views, synonyms, table-structured files, and Excel spreadsheets. See also nickname.

data source record
See identity.

data source reference
See external reference.

data source type
A grouping of data sources according to the protocol that is used to access the data.

data space
A separate area of addressable storage that contains only data. A data space can hold up to 2 gigabytes of data.

data space index
A machine interface object that provides an ordering to all or part of the entries in one or more data spaces, provides keyed access to entries in the data spaces, and provides a mechanism for uniqueness in column and field values across data spaces.

data storage interrupt (DSI)
An interrupt posted when a fault is encountered accessing storage or I/O space. A typical data storage interrupt is a page fault or protection violation.

data storage-management application-programming interface (DSMAPI)
A set of functions and semantics that can monitor events on files, and manage and maintain the data in a file. In an HSM environment, a DSMAPI uses events to notify data management applications about operations on files, stores arbitrary attribute information with a file, supports managed regions in a file, and uses DSMAPI access rights to control access to a file object.

See data store.

data store

  1. The location where one or more Contributor applications are stored. A data store contains the information needed to connect to a database supporting the Contributor applications.
  2. A place (such as a database system, file, or directory) where data is stored.
  3. A data structure where documents are kept in their parsed form.
  4. In a virtualized environment, the location where virtual machine data is stored.
  5. A component that manages the job runtime information at the tracked system. A data store is dedicated to the storing and possible retrieval of sysout data sets belonging to submitted jobs, to optimize the sysout availability.
  6. A logical container for different schemas and directories.

data store profile
An object that defines properties used by the default data store plug-in, which is used to persistently store events received by the event server.

An object that gathers together all the data sources from which a build or reference structure acquires data.

data stream

  1. An object that represents an event.
  2. The commands, control codes, data, or structured fields that are transmitted between an application program and a device such as printer or nonprogrammable display station.
  3. A string of information that serves as a source of package data.

data-stream exception
In IPDS architecture, a condition that exists when the printer detects an invalid or unsupported command, order, control, or parameter value from the host. Data-stream exceptions are those whose action code is X'01', X'19', or X'1F'.

data streaming

  1. The uninterrupted transfer of information over an interface in order to achieve high data transfer rates.(A)
  2. In printing, a noninterlocked method of data transfer used by the printer channel to decrease data transfer time during write operations.

DataStream item
A Data Manager object that is required wherever mapping is performed. A DataStream item is used to map a data source column to a transformation model element in a fact build, or a level attribute in a reference structure.

data striping
Storage process in which information is split into blocks (a fixed amount of data) and the blocks are written to (or read from) a series of disks in parallel.

data structure

  1. In Open Source Initiative (OSI), the syntactic structure of symbolic expressions and their storage allocation characteristics.
  2. A structure that describes how data is organized, arranged, and represented, such as in a string or array of integers.
  3. An area of storage that defines the layout of the fields, called subfields, within the area. A data structure is program described.
  4. The composition of the data, including repeating sub-structures, nested groupings, sequences, and choices.

data supplier
In Performance Toolbox, a program that supplies statistics across a network. See also data consumer.

data switching exchange (DSE)
The equipment that is installed at a single location to provide switching functions, such as circuit switching, message switching, and packet switching.

data synchronization
The process by which a system ensures that data previously given to the system by an access method is written to some form of nonvolatile storage.

data synchronization task
The process of establishing the interval at which data from the IBM Connections applications is synchronized with the News repository.

data table
A file whose records are held in main storage.

data tag
A user-defined numeric value that uniquely identifies a group of data. Data tags can be assigned to table spaces or storage groups and are used in DB2 workload management configurations to monitor and control activities based on which data the activities access.

data terminal equipment (DTE)

  1. A device on a data link that sends and receives data, and provides data communications control functions according to protocols.
  2. In OSI, a physical node on a network.
  3. A communications device that is the source or destination of signals in a network, it is typically a terminal or computer.

data terminal ready (DTR)
A signal to the modem used with the EIA 232 protocol.

data token
In OSI, the token that controls which peer entity has permission to send on a half-duplex connection.

Data Tools Platform (DTP)
An Eclipse plug-in-based platform that facilitates the use of data sources within Eclipse.

data tower
In AFP Utilities, a set of Intelligent Printer Data Stream commands that represent a data type, such as text, image, graphics, and bar code.

data trace
A record of the data that is sent and received on a communication link.

data traffic
In data communications, the quantity of data transmitted past a particular point in a path.

data traffic reset state
The state a session usually enters before the start data traffic state, and after Clear or Bind Session, if cryptography verification (CRV) is used. While a session is in this state, requests and responses for data and data flow control cannot be sent. Only certain session control requests can be sent. See also command.

data transfer
The movement, or copying, of data from one location and the storage of the data at another location.

data transfer mode
See data transfer phase.

Data Transfer Object (DTO)
An object that carries data between processes to reduce the number of method calls.

data transfer phase
The phase of a data call during which data signals can be transferred between data terminal equipments (DTES) connected via the network.

data transfer rate
The average number of bits, characters, or blocks per unit time passing between corresponding equipment in a data transmission system. The rate is expressed in bits, characters, or blocks per second, minute, or hour. Corresponding equipment should be indicated; for example, modems, intermediate equipment, or source and sink.

Data Transformation Framework (DTF)
An infrastructure that includes data bindings and function selectors, which enables an adapter to convert native data formats to business objects and to convert business objects back to native data formats, such as XML.

data transmission
The conveying of data from one place for reception elsewhere by telecommunication means.

Data Transmission Facility (DTF)
In Sterling Connect:Direct For z/OS, the nucleus component that executes user commands and processes. The DTF controls information distribution to other nodes in the network.

data transmission line
See telecommunication line.

data transparency
A data attribute that permits the access and handling of the data regardless of location and source.

data transport
A feature in the Emptoris Contract Management application to transport components from one environment to another.

data tree
See metadata tree.

data type

  1. In OSI, a category of data clearly defined using a data declaration method, such as ASN.1 or Pascal.
  2. In CDE, a mechanism that associates particular data files with the appropriate applications and actions.
  3. In programming languages, a descriptor of a set of values together with a set of permitted operations. A data type determines the kind of value that a variable can assume or that a function can return.
  4. In SQL, a descriptor of a set of values and a set of permitted operations. A data type determines the kind of value that a column, literal, parameter, special register, or variable can have or that can be the result of an expression, a function, or a method.
  5. In Informix, a descriptor that is assigned to each column in a table, function argument, or function return type that indicates the type of data that can be held. See also built-in data type, complex data type, distinct data type, opaque data type, user-defined data type.
  6. An attribute that is used for defining data as either numeric or character or both.
  7. An element of a data model that represents a set of data stored in a data source, for example, a table or view in a relational database.
  8. A category that identifies the mathematical qualities and internal representation of data and functions. See also type.

data type mapping
The mapping of a data type to another data type across products or languages. For example, the Oracle type FLOAT maps to the DB2 type DOUBLE. See also forward data type mapping, reverse data type mapping.

Data Universal Numbering System (DUNS)
A system in which internationally recognized nine-digit numbers are assigned and maintained by Dun & Bradstreet to uniquely identify worldwide businesses.

Data Universal Numbering System number (DUNS number)
A unique, nine-digit company identification number issued by Dun & Bradstreet Corporation.

data value

  1. In Business Graphics Utility, a single, numeric data item entered as a value for a horizontal line or vertical line. See also data group.
  2. The actual information contained in a field, such as "Bob," george@someotherdomain.com, or 12/27/2013.

data view
A simplified view of a database. Data views enable database administrators or business analysts to define table join criteria, build frequently-used result columns, summarize detail data (when necessary), remove unnecessary columns of data from view, build frequently used Sub-SELECT support, and define understandable column names.

data visibility group (DVG)
In Sterling Control Center, a user defined group that limits the events (data) that a specific user can monitor. See also data visibility group criteria.

data visibility group criteria (DVG criteria)
A set of parameters that are used to define data visibility groups (DVGs). See also data visibility group.

data visualization

  1. The process of presenting data patterns in graphical format, including the use of traditional plots as well as advanced interactive graphics. In many cases, visualization reveals patterns that would be difficult to find using other methods.
  2. A visual display of relationships in multidimensional data that enables analysis.

data warehouse

  1. A subject-oriented collection of data that is used to support strategic decision making. The warehouse is the central point of data integration for business intelligence. It is the source of data for data marts within an enterprise and delivers a common view of enterprise data.
  2. A central repository for all or significant parts of the data that an organization’s business systems collect.

data warehouse appliance
A hardware device with an integrated historical data store for user data.

Data Warehouse Center
The component of DB2 that provides the graphical interface and the software behind it that is used to work with the components of the warehouse.

data warehousing
A set of hardware and software components that can be used to analyze large amounts of data for making effective business decisions. For example, data warehousing can be used to analyze daily sales information, customer orders, products, inventory, and schedules.

Data Window Services (DWS)
Services provided as part of the Callable Services Library that allow manipulation of data objects such as VSAM linear data sets and temporary data objects known as TEMPSPACE.

data word
In Fibre Channel technology, a type of transmission word that occurs within frames. The frame header, data field, and cyclic redundancy check (CRC) all consist of data words. See also frame, ordered set, transmission word.

data wrangling
The process of manually converting data from one raw form into another format that allows for more convenient consumption of the data with the help of semi-automated tools.

A three-part value that designates a day, month, and year: for example, YYYY-MM-DD. See also timestamp.

date annotation
An annotation associated with a date range that is used to provide highlights about key events on a trend graph so that users can understand inclines or declines in the trend.

date duration
A DECIMAL(8,0) value that represents a number of years, months, and days in the format yyyymmdd.

date/time literal
A literal that specifies a value for a date or date/time column in a column map.

datetime value
A value of the data type DATE, TIME, or TIMESTAMP.

See Data Exchange.

See direct access unmovable.

Daylight Saving Time (DST)
A one-hour forward adjustment of local standard time that is adopted during the summer season to maximize the use of daylight.

days sales outstanding (DSO)
A calculation of the average number of days for a company to collect revenue after making a sale.

See database.

See decibel.

A family of IBM licensed programs for relational database management.

DB2 administration server
A control point that is used to assist with administration tasks on DB2 servers and to perform remote tasks on the server and the host system on behalf of a client request. The DB2 administration server is deprecated.

DB2 administrative authority
A set of privileges, often covering a related set of objects, and often including privileges that are not explicit, have no name, and cannot be specifically granted.

DB2 Call Level Interface
See call level interface.

DB2 client
See IBM data server client.

DB2 cluster services
The software components that the DB2 pureScale Feature uses for recovery automation, cluster management, and shared storage in a DB2 pureScale instance.

DB2 cluster services tiebreaker
A shared disk partition that helps determine which group of hosts in the DB2 pureScale instance has the operational quorum and survives if the InfiniBand network encounters a split instance due to a communication failure.

DB2 command
An instruction to the operating system to access and maintain the database manager. For example, DB2 commands can be used to start or stop a database and to display information about current users and the status of databases.

DB2 control server
A DB2 database system that contains the satellite control database, SATCTLDB. See also satellite.

DB2 copy
One or more installations of DB2 database products in a particular location on a system. Multiple DB2 copies can be installed and run on the same system.

DB2 copy name
The name that refers to a single instance of an installation of a DB2 database product, which is specified when the product is installed.

DB2 for i5/OS
The integrated relational database manager on the system. It provides access to and protection for data. It also provides advanced functions such as referential integrity and parallel database processing.

DB2 Geodetic Extender
Formerly a DB2 component that stores and manipulates spatial data using the round-Earth model that is a continuous, closed globe (unlike DB2 Spatial Extender, which treats the Earth as a flat map).

See DB2 Interactive.

DB2 Interactive (DB2I)
An interactive service within DB2 for z/OS that facilitates the execution of SQL statements, DB2 operator commands, and programmer commands and the invocation of utilities.

DB2 member
See member.

DB2 Net Search Extender
A program that provides full-text retrieval through a DB2 procedure.

DB2 notify log
See administration notification log.

DB2 pureScale instance
A DB2 instance that uses the DB2 pureScale architecture and runs on multiple hosts.

DB2 Query Manager (Query Manager)
Part of the DB2 Query Manager and SQL Development Kit for i5/OS licensed program that is a collection of tools used to obtain information from the DB2 for i5/OS database. DB2 Query Manager can also be used to create query definitions, to run new or existing query definitions, or to format query information.

DB2 Spatial Extender
A DB2 component that stores and manipulates spatial data. DB2 Spatial Extender is used to generate and analyze spatial information about geographic features. See also geographic information system.

DB2 Text Search
A component that can be optionally installed with DB2 Database for Linux, UNIX, and Windows that provides text search capabilities. DB2 Text Search works with SQL, XML, and XQuery.

DB2 thread
See thread.

See DB2 workload manager.

DB2 workload management
The DB2 capability that monitors and controls the flow of work and resource consumption, including the capability in the DB2 workload manager.

DB2 workload manager (DB2 WLM)
The subset of DB2 workload management capability that can be used to create a DB2 workload, a DB2 service class, a DB2 threshold, or a DB2 work action set. This subset of capability is controlled by a separate license.

DB2 XML Extender
A program that is used to store and manage XML documents in DB2 tables. Well-formed and validated XML documents can be generated from existing relational data, stored as column data, and the content of XML elements and attributes can be stored in DB2 tables.

See database administrator.

Pertaining to a class of SPL routines that only a user with DBA database privileges creates.

See database access thread.

See database management batch.

See double-byte character large object.

See double-byte character set.

DBCS code
The hexadecimal code, 2 bytes in length, that identifies a double-byte character.

DBCS conversion
A function of the operating system that allows a display station user to enter alphanumeric data and request that the alphanumeric data be converted to double-byte data.

DBCS conversion dictionary
A table used by the conversion function to map alphanumeric entries to double-byte entries. The system-recognized identifier for the object type is *IGCDCT.

DBCS data
In DB2 for i5/OS, data that is associated with a double-byte character set.

DBCS/EBCDIC mixed field
A field that contains both DBCS and EBCDIC data. The DBCS portions should always be enclosed with SO/SI control characters in both inbound and outbound data. In the case of inbound data, the control characters are automatically created by the terminal.

Pertaining to a character string that is either SBCS or bracketed DBCS, but not both. See also DBCS-graphic, DBCS-only, DBCS-open.

DBCS font file
A system-supplied file that holds the 24x24 character images of one of the following groups of commonly used characters: 1) Japanese non-Kanji and basic-Kanji, 2) Korean non-Hangeul/non-Hanja, Hangeul, and a subset of Hanja, 3) Traditional Chinese non-Chinese and a subset of primary Chinese characters, or 4) all IBM-defined Simplified Chinese characters.

DBCS font table
A system-supplied table that holds either 24x24 or 32x32 pel character images of a double-byte character set. A Japanese 24x24 DBCS font table holds Japanese extended Kanji and user-defined characters. A Korean 24x24 DBCS font table holds a subset of Hanja and user-defined characters. A Traditional Chinese 24x24 DBCS font table holds a subset of primary Traditional Chinese, all secondary Chinese, and user-defined characters. A Simplified Chinese 24x24 DBCS font table holds IBM-supplied Simplified Chinese characters as well as user-defined characters. A 32x32 DBCS font table holds 32x32 pel character images of a double-byte character set, including its user-defined characters. The system-recognized identifier for the object type is *IGCTBL.

Pertaining to a character string in which each character is represented by 2 bytes. Used only with the EBCDIC encoding scheme. The character string does not contain shift-out (SO) and shift-in (SI) characters. See also DBCS-either, DBCS-only, DBCS-open.

DBCS number
The decimal value, 5 digits in length, that identifies a double-byte character.

Pertaining to a character string that is only bracketed DBCS. See also DBCS-either, DBCS-graphic, DBCS-open, graphic data type.

Pertaining to a character string that can be a mixture of SBCS and bracketed DBCS. See also DBCS-either, DBCS-graphic, DBCS-only.

DBCS sort table
A system-supplied object that contains sequencing information to sort double-byte characters. The system-recognized identifier for the object type is *IGCSRT.

See Database Control.

DBCTL environment
See database control environment.


  1. See database descriptor.
  2. See database description.

See database/data communication.

See database description generation.

See database data set.

See database identifier.

See database instance ID.

See delivery-confirmation bit.

DB monitor
See database monitor.

See database management system.

DBMS driver
See database management system driver.

See database program communication block.

See Database Recovery Control.

DBRC group
In IMS Version 10, one or more DBRC instances that share a single RECON data set in an IMSplex environment. Each DBRC group has a group identifier (GROUP ID), which is unique for that group. DBRC groups are used by DBRC, whether or not parallel RECON access is enabled.

DBRC request
An action (command process, query, and update) that is asked of DBRC by IMS, DBRC application programs, and jobs.

See database request module.

The logical unit of storage in an Informix database. For example, a table or table fragment is created in a dbspace. See also root dbspace.

See distribution center.

See Document Content Architecture.


  1. See data control block.
  2. See device control block.

See D-channel backup.

See data country code.

See Data Communications Control.


  1. See data carrier detect.
  2. See default configuration directory.


  1. See data circuit-terminating equipment.
  2. See Distributed Computing Environment.

DCE cell
A group of Distributed Computing Environment (DCE) machines that work together and are administered as a unit. A cell represents a group of users, systems, and resources that typically have a common purpose and share common DCE services.

See Distributed Command Execution Manager.

DCE principal
A user ID that uses the distributed computing environment.


  1. See Document Composition Facility.
  2. See Document Control Facility.
  3. See data center fragment.

See delta channel.

D-channel backup (DCBU)
An ISDN NFAS configuration where two of the T1 facilities have a D-channel, one of which is used for signaling, and the other as a backup in case the other fails. See also Non-Facility Associated Signaling.

See data-conversion interface.

See Data Control Language.

See declare control block.

See declarations generator.


  1. See Digital Certificate Manager.
  2. See data center model.
  3. See dynamic cache management.

DCN Local-Network Protocol
An interior gateway protocol designed for use within autonomous systems.

DCOM traffic
See Distributed Component Object Model traffic.

See decision checkpoint.

See data communication program communication block.

See data connection resource.

DCS directory
See Database Connection Services directory.

See discontiguous shared segment.


  1. See device characteristics table.
  2. See destination control table.

See data cache unit.

A multi-page spreadsheet made up of two or more dimensions. See also cube.


  1. See data definition.
  2. See device driver.

See Distributed Database Management System.

See dynamic data exchange.

DDE client
The computer, or an application running on it, that provides the function of receiving dynamic data exchange (DDE) data from another DDE-enabled application.

DDE server
The computer, or an application running on it, that provides dynamic data exchange (DDE) data to another DDE-enabled application. In VisualAge RPG, all components provide DDE server functions.


  1. See distributed data facility.
  2. See Dynamic Data Format.
  3. See data definition format.


  1. See direct dial in.
  2. See distributed data interface.

See Data Definition Language.


  1. See disk drive module.
  2. See distributed data management.

DDM Architecture
See Distributed Data Management Architecture.

DDM conversation
The flow of data between an application requester and an application server.

DDM file
A system object with type *FILE, created by a user on the local (source) system, that identifies a data file that is kept on a remote (target) system. The DDM file provides the information needed for a local system to locate a remote system and to access the data in the remote data file.

See Defense Data Network.

See data definition name.

See Dynamic Domain Name System.

See dynamic data object.


  1. See Delivery Duty Paid.
  2. See Datagram Delivery Protocol.

See dynamic device reconfiguration.


  1. See Dataphone digital service.
  2. See data description specifications.

See Digital Subscriber signaling System Number 1.

See digital data service adapter.

DD statement
See data definition statement.


  1. See Droplet Execution Agent.
  2. See Data Encryption Algorithm.

To take a resource of a node out of service, rendering it inoperable, or to place it in a state in which it cannot perform the functions for which it was designed. See also activate.

deactivate link (DACTLINK)
In SNA, a command used to initiate link deactivation.

deactivate logical unit (DACTLU)
In SNA, a command used to initiate logical unit deactivation.

deactivate physical unit (DACTPU)
In SNA, a command used to initiate physical unit deactivation.

A function that makes map components unavailable for use by the system. The system does not enable the deactivation the mandatory groups, segments, composites, and elements.

The difference between the set point and reset point of a discrete device.

dead code
Code that is never referenced, or that is always branched over.

dead code elimination
A compiler optimization that removes code that is never referenced, or that is always branched over.

dead date
The date past the due date plus the grace period, at which point the component becomes inoperable.

deadhead accessorial
An accessorial that contains charges for the deadhead distance between the destination of one shipment and the origin of the next shipment.

deadhead distance
In logistics, a distance or period during which a hire vehicle is traveling without generating revenue for its owner. For example, an empty backhaul would give rise to a deadhead distance. See also backhaul.

deadhead leg
A repositioning move in which a truck carries no cargo. A deadhead move is necessary when a carrier does not have a backhaul opportunity. See also repositioning leg.

dead-letter mailbox
A mailbox that stores messages that cannot be added to a particular mailbox. The primary role of this mailbox is to provide temporary data storage until the administrator can correct the problem.

dead-letter queue (DLQ)
A queue to which a queue manager or application sends messages that cannot be delivered to their correct destination.

dead-letter queue handler
A utility that monitors a dead-letter queue (DLQ) and processes messages on the queue in accordance with a user-written rules table. A sample dead letter queue handler is provided by IBM MQ.

The time by which a job must be completed.

deadline date
The latest date by which an occurrence must be complete.

deadline scheduling
A method of scheduling jobs by time of day, or by week, month, or year.

deadline time
The latest time by which an occurrence must be complete.

deadline WTO message
An operator message (EQQW776I) that is issued when a started operation has not been marked as completed before the deadline time. In addition to the standard message, the user-defined text that describes the operation is issued as part of the WTO.


  1. Unresolved contention for the use of resources.
  2. A condition in which two independent threads of control are blocked, each waiting for the other to take some action. Deadlock often arises from adding synchronization mechanisms to avoid race conditions.
  3. A condition under which a transaction cannot proceed because it is dependent on exclusive resources that are locked by another transaction, which in turn is dependent on exclusive resources in use by the original transaction.

deadlock detector
A process within the database manager that monitors the states of the locks to determine whether a deadlock condition exists. When a deadlock condition is detected, the detector stops one of the transactions involved in the deadlock. This transaction is rolled back, and the other transaction can proceed.

deadman switch
An action that occurs when Cluster Aware AIX (CAA) detects that a node has become isolated in a multinode environment. This setting occurs when nodes are not communicating with each other via the network and the repository disk.

deadman switch timer
A kernel timer that works on a node that has lost its disk lease and has outstanding I/O requests. By causing the kernel to panic, this timer ensures that the affected node cannot complete the outstanding I/O requests. If the node were able to complete outstanding I/O requests without a disk lease, file system corruption could result.

dead store
A store into a memory location that will later be overwritten by another store without any intervening loads. In this case, the earlier store can be deleted.

dead zone
An area of a tablet from which no input reports are generated. Each virtual terminal can set its own dead zones.

To release a resource that is assigned to a specific task.

deal period
A period of time in which a retailer qualifies for the manufacturer's discounted price.

deal term
Stated conditions, restrictions, and exclusions on a deal.

debit card
A payment method where a cardholder purchases goods and services using a card and PIN to electronically access funds in the cardholder's bank account.

To remove each logical record from a block.

To prevent a function from being called again until a certain amount of time has passed without it being called.

To detect, diagnose, and eliminate errors in programs.

debug command
A feature or command that assists in identifying programming errors during the software development process.

debug engine
The server component of the debugger, whose client/server design enables both local and remote debugging. The debug engine runs on the same system as the program being debugged.

A tool used to detect and trace errors in computer programs.

debugging line

  1. In COBOL, any line with a D in the indicator area of the line.
  2. A COBOL statement run only when the WITH DEBUGGING MODE clause is specified. Debugging lines can help determine the cause of an error.

debugging mode
A special mode in which a program provides detailed output about its activities to aid a user in detecting and correcting errors in the program itself or in the configuration of the program or system.

debugging section
In COBOL, a declaratives section that receives control when an identifier, file name, or procedure name is encountered in the Procedure Division.

debugging session
The debugging activities that occur between the time that a developer starts a debugger and the time that the developer exits from it.

debug mode

  1. A mode in which a program provides detailed output about its activities to aid a user in detecting and correcting errors in the program itself or in the configuration of the program or system.
  2. In DFSMShsm, the method of operation that projects the changes that would occur in normal operation but in which no user data is moved.
  3. An environment in which programs can be tested.

The process by which the packet capture data is decompiled so that all of the ingested data is produced as a results report.

In telecommunication, to remove or reveal a data structure that is included within another data structure, or encapsulated.

decibel (dB)
A unit of signal strength or loudness, such as the signal on a data communications channel.

deciding class
The class whose number of instances in the source database determines how many instances Integration Composer creates in the target database.

A division of data into ten ordered groups of equal size. The first decile contains 10% (one-tenth) of the records with the highest values of the ordering attribute. See also quantile, quartile, quintile, vingtile.

Pertaining to a system of numbers to the base 10. The decimal digits range from 0 through 9.

decimal constant
A numerical data type used in standard arithmetic operations. Decimal constants can contain any digits 0 through 9. See also integer constant.

decimal floating-point number
A 64-bit or 128-bit representation of a number with a precision of 16 or 34 decimal digits and an exponent. Decimal floating-point numbers include normal numbers, subnormal numbers, and the special values of infinity, NaN, and sNaN. In IBM SQL, decimal floating-point numbers are not considered to be floating-point numbers. See also floating-point number, infinity, normal number, not-a-number, signaling NaN, subnormal number.

decimalization table
In Cryptographic Support, a table of 16 decimal characters that is used to convert a hexadecimal value to a decimal value. Each hexadecimal digit is used as an offset in the (decimalization) table and is replaced with the value found there.

decimal overflow
A condition that occurs when one or more nonzero digits are lost because the destination field in a decimal operation is too short to contain the results.

decimal position

  1. The location of the decimal point in a series of numbers.
  2. Numbers to the right of the decimal point. For example, 4.009 has three decimal positions.

decimal separator
The local symbol used to indicate the decimal position in a number.

To convert enciphered data in order to restore the original data. See also cryptographic, encipher.


  1. A gateway within a business process where the sequence flow can take one of several alternative paths.
  2. The component of a policy expression that indicates the specific behavior or property that the policy affects. Types of decisions include actions, goals, results, and configurations. See also decision name.
  3. A gateway that routes an input to one of several alternative outgoing paths, depending on its condition. A decision is like a question that determines the exact set of activities during the execution of a process. Questions might include: What type of order? Or How will the order be shipped?

Decision Center console
A designated workspace where business users can work collaboratively to author, edit, organize, and search for business rules.

decision checkpoint

  1. In the IBM Integrated Project Development (IPD) project governance methodology, a point at which the team decides whether to commit to further work. Acronym: DCP. For example, the Plan DCP is the point at which a product team makes plan commitments to the business, including the feature-level requirements to be delivered.
  2. A business transformation operations process (BTOP) that consists of three phases: concept, plan, and qualify.

decision diagram
A set of graphical elements that visually represent the details of a decision in a top-down structure with dependency lines.

decision engine
An implementation of the rule engine that compiles rulesets into executable or intermediate code and can optimize the performance of the rulesets. See also rule engine.

decision expression
A syntax that is used to express a combination of decision variables in a more compact way. See also decision variable.

decision federator (DF)
See policy editor storage.

The combination of predictive analytics and decision arbitration to deliver automated, as-needed guidance to business processes.

decision input
In a policy-enabled system, a data value (along with its name and type) or sensor value that the managed resource provides to the autonomic manager and that the autonomic manager uses when making a decision.

decision list
An algorithm that identifies subgroups or segments that show a higher or lower likelihood of a given binary (yes/no) outcome relative to the overall population.

decision logic
A set of rules that a software component uses to make a decision based on some input data.

Decision Model and Notation (BMN)
An industry standard for describing and modeling organizational decisions that was published by the Object Management Group to support decision management and business rules.

decision name
An attribute that identifies a specific decision of a result-based policy or a configuration-profile-based policy that is used for solicited decision requests. All policies in a policy set have the same decision name and use the same collection of names and types of result values, which are returned by the autonomic manager during policy evaluation. See also decision, policy set.

decision node

  1. A representation of an if-then=else condition on a decision tree where a choice between at least two possible alternatives is made.
  2. A representation of an if-then-else condition. A decision node splits a single transition in a statechart or activity diagram into several branch transitions.

decision operation
A function that defines the decision-making logic and the input and output data for a decision. A decision operation is implemented as a ruleset.

decision output
In Policy Management for Autonomic Computing, the data value (along with its name and type) in a result-based policy or a configuration-profile-based policy that is used for solicited decision requests. A decision output is the data value that is returned by the autonomic manager that represents the decision in the policy.

decision point

  1. A part of a program in a policy-enabled system that requests and accepts solicited decisions from an autonomic manager. A managed resource contains one or more decision points, which provide policy support for the managed resource. See also autonomic manager.
  2. An intersection in a business process that determines the next step in the business process. A decision point is much like an if/then statement, in which the answer determines the next action.

decision point pattern
A set of interfaces that are linked and that provide developers with a framework for implementing policy-based management in their applications. Each decision point pattern identifies where decision points are needed in the application to implement the operational flow. Policy Management for Autonomic Computing provides three decision point patters: an auditor pattern, which checks compliance with a specific set of policies; a planner pattern, which uses policies to design or configure a new system; and a virtualization pattern, which provides a virtualized interface to a physical system.

decision rule
A rule that consists of one or more decision considerations and one conclusion.

decision service
A set of related decisions that are contained in a business rule application. Rules make up the decision service and determine its behavior. Decision services can be organized into one or more rule projects.

decision-support application
An application that provides information that is used for strategic planning, decision-making, and reporting. It typically executes in a batch environment in a sequential scan fashion and returns a large fraction of the rows scanned. Decision-support queries typically scan the entire database.

decision support database
A database that is designed for user information analysis that typically provides fast response to ad hoc usage. Decision support databases are generally denormalized.

decision-support query
A query that a decision-support application generates. A decision support query often requires multiple joins, temporary tables, and extensive calculations, and can benefit significantly from PDQ.

decision support system
An ad hoc query, reporting, and complex analysis tool that is designed for accessing and transforming raw data into useful information.

decision table
A form of business rule that captures multi-conditional decision-making business logic in a table where the rows and columns intersect to determine the appropriate action. See also ruleset.

decision tree
A way of representing business rules in a tree form. Decision trees provide a structure for laying out options and investigating the possible outcomes of choosing those options.

decision tree algorithm
An algorithm that classifies data, or predicts future outcomes, based on a set of decision rules. Examples of decision tree algorithms are C & R tree, CHAID, QUEST, and C5.0. See also Chi-squared Automatic Interaction Detector algorithm, Quick, Unbiased, Efficient Statistical Tree algorithm, rule set.

Decision Validation Services (DVS)
A set of testing and simulation capabilities with which business users and policy managers can verify the rules they have written, and determine if potential changes will have the intended outcome.

decision variable
An unknown in a model, which is a placeholder for the solution of the problem in the model. See also decision expression, variable.

Decision Warehouse
A warehouse that saves execution traces to a database so that users can query the data store to get information on particular executions or transactions.

An XML document that contains a collection of Wireless Markup Language (WML) cards. See also card.


  1. In Java programming, a statement that establishes an identifier and associates attributes with it, without necessarily reserving its storage or providing the implementation. (Sun)
  2. In Ada language, a construct that associates an identifier (or some other notation) with an entity. This association is in effect within a region of text called the scope of the declaration. Within the scope of a declaration, there are places where it is possible to use the identifier to refer to the associated declared entity. At such places the identifier is said to be a simple name of the entity; the name is said to denote the associated entity.
  3. In the C and C++ languages, a description that makes an external object or function available to a function or a block statement.
  4. A statement that establishes the names and characteristics of data objects and functions used in a program.

declarations generator (DCLGEN)
A subcomponent of DB2 for z/OS that generates SQL table declarations and COBOL, C, or PL/I data structure declarations that conform to the table. The declarations are generated from DB2 system catalog information.

declaration statement
A programming language statement that describes or defines objects; for example, defining a program variable. See also data definition statement, procedure.

Pertaining to a statement, model, or application that assumes no particular order. That is, the result does not depend on the order of statements, or parts of the model, or components of the application.

declarative customization
The process of changing files that express rules or information for various algorithms in a Watson pipeline.

declarative section
In COBOL, a special-purpose section, at the beginning of the Procedure Division that can be used for error checking or debugging.

declarative security
The security configuration of an application during assembly stage that is defined in the deployment descriptors and enforced by the security run time.

declarative sentence
In COBOL, a compiler-directing statement that specifies when a debugging section or an exception/error procedure is to be run.

An identifier and optional symbols that declare a single function, object or data type within a declaration. See also function declarator.


  1. To create a record object.
  2. To assign the attributes of a variable.

declare control block (DCLCB)
A control block containing file information.

declared document
A document that has been declared as a record. A declared document cannot be deleted until its associated record is deleted. The author can no longer modify the declared security of the declared document.

declared procedure
The object resulting from processing a DECLARE PROCEDURE statement in a compiled compound statement.

declared temporary table
A table that holds temporary data and is defined by using the SQL statement DECLARE GLOBAL TEMPORARY TABLE. Information about declared temporary tables is not stored in the DB2 catalog, so this kind of table is not persistent and can be used only by the application process that issued the DECLARE statement. See also base table, created temporary table, temporary table.

For Department of Defense (DoD), to lower a record classification from a classified status, like Secret, to Unclassified. Declassifying a record by downgrading to Unclassified is not allowed.

declustered RAID (DRAID)
See also rebuild area.

A network architecture that defines the operation of a family of software modules, databases, and hardware components typically used to tie Digital Equipment Corporation systems together for resource sharing, distributed computation, or remote system configuration. DECnet network implementations follow the Digital Network Architecture (DNA) model.

To convert data by reversing the effect of some previous encoding.


  1. A device that has a number of input lines of which any number may carry signals and a number of output lines of which not more than one may carry a signal, there being a one-to-one correspondence between the outputs and the combinations of the input signals. (I)(A)
  2. In bar codes, the component of a bar code reading system that receives the signals from the scanner, performs the algorithm to interpret the signals into meaningful data, and provides the interface to other devices.


  1. The process of breaking up an XML document for storage in database tables.
  2. The separation of a compound word into its constituents (or formation elements). Internally this consists of three distinct steps: segmentation, normalization, and annotation.

To decompose a word or a multiword unit into its constituent parts.


  1. The process of restoring compressed data to its original state, so that it can be used again.
  2. A function that expands data to the length that precedes data compression.
  3. A function that exchanges control characters for actual data.

In graphical user interfaces (GUIs), a glyph that annotates a resource with status information, for example to indicate that a file has changed since it was last saved or checked out of a repository.

A process during which an item is removed from the network mainframe, but remains on a particular node within the network.

A register that counts down each time an event occurs.


  1. To decipher data.
  2. In Cryptographic Support, to convert ciphertext into plaintext. See also encrypt.


  1. In computer security, the process of transforming encoded text or ciphertext into plaintext.
  2. The process of decoding data that has been encrypted into a secret format. Decryption requires a secret key or password.

See Digital European Cordless Telecommunications.

In a printer, to remove abnormal curving of the paper.

See data entry database.

Pertaining to the assignment of a system resource (such as a device, a program, or an entire system) to an application or purpose.

dedicated channel
A channel that permanently connects two or more locations.

dedicated circuit
A circuit that is designated for exclusive use by specified users.

dedicated cloud
A private cloud computing environment that provides infrastructure with single-tenant hardware. See also borderless.

dedicated fleet
A trucking fleet that is owned by the carrier but is licensed for exclusive use by one or more shippers. A shipper arranges with the carrier to use the dedicated fleet, which helps ensure that the needed truck capacity is always available. See also preferred fleet, private fleet.

dedicated line
A connection not requiring dialing to establish communication.

dedicated location
An area in a warehouse that is reserved for specific items.

dedicated mailbox
A mailbox on the mail server that is configured with a rule or trigger to direct email notification replies to it.

dedicated processor
A data processing device that is reserved for a single job or task.

dedicated RoCE environment
An environment in which only a single operating system instance can use a physical RoCE feature. A dedicated RoCE environment applies to an IBM zEnterprise EC12 (zEC12) with driver 15, or an IBM zEnterprise BC12 (zBC12).

dedicated save operation
An operation that the user runs to save objects when no other jobs are running. See also save-while-active operation.

dedicated server
A processor on a network that functions only as a server, not as a requester and a server.

Dedicated Server for Domino (DSD)
A System i server that is specially designed to run Lotus Domino servers and applications.

dedicated service
An EGL service that is available to a Rich UI application and that runs locally to the Rich UI Proxy.

dedicated service tools (DST)
Service functions that are available only from the console and that can run when the operating system is not available, as well as when the operating system is available.

dedicated storage
Storage within a storage facility that is configured such that a single host system has exclusive access to the storage.

dedicated system
A system intentionally reserved for a single job or task.

See deduplicate.

To reduce storage needs by eliminating redundant data. Only one instance of the data is retained on storage media, such as disk or tape. Other instances of the same data are replaced with a pointer to the retained instance.


  1. See data deduplication.
  2. The process of creating representative records from a set of records that have been identified as representing the same entities. See also data enrichment, matching, one-source matching, survivorship.
  3. The process of removing identical search results that were returned from one or more data sources. See also near deduplication.

The presence of an event, a user, or both, in the working memory.

In COBOL, to remove all editing characters from a numeric edited data item to determine the unedited numeric value of the item.

The process of removing one or more envelopes from a document or a set of documents.

The IBM Watson deep question analysis and evidence-based reasoning system that competed on the Jeopardy! game show. It also refers to the research team and research project that was devoted to building the software that uses advanced natural language processing, semantic analysis, information retrieval, automated reasoning, and machine learning to answer questions.

deep web
Any web content that is not indexed, and therefore cannot be found, by a standard search engine. See also dark web.


  1. See Dynamic Event Framework.
  2. See deployment evaluation framework.


  1. Pertaining to an attribute, value, or option that is assumed when none is explicitly specified.
  2. A value that is automatically supplied or assumed by the system or program when the user does not specify a value.

default access control list (default ACL)
A template used to generate access control lists (ACLs) for the files within a directory. A default ACL is not used to verify permissions.

default ACE
An editable access control entry (ACE) whose source type is default.

default ACL
See default access control list.

default action
The action designated to execute when a Fixlet is deployed. When no default action is defined, the operator is prompted to choose between several actions or to make an informed decision about a single action.

default agent site
An agent site that is located on the same system as the control server. A remote agent site does not require the installation of IBM DB2 Warehouse Manager Standard Edition. See also agent site, remote agent site.

default application
See Snoop.

default argument
An argument that is declared with default values in a C++ function prototype or declaration. If a call to the function omits this argument, a default value is used. An arguments with a default value must be the trailing argument in a function prototype argument list.

default class
A class with preprogrammed definitions that can be used for simple implementations.

default clause
In the C or C++ languages, within a switch statement, the keyword default followed by a colon, and one or more statements. When the conditions of the specified case labels in the switch statement do not hold, the default clause is chosen.

default configuration
In OSI, the set of default configuration and initialization values supplied with OSI Communications Subsystem. The user can change the default configuration, which is provided by initial records supplied in the subsystem information base shipped with OSI Communications Subsystem.

default configuration directory (DCD)
The directory in which the default ODM object classes are stored, including application-specific object classes. See also active configuration directory, staging configuration directory.

default connection
The connection on which HATS transforms and presents host application screens to the user. See also background connection, connection.

default constructor
A C++ constructor that takes no arguments, or if it takes any arguments, all its arguments have default values.

default contract
In WebSphere Commerce, an agreement representing the terms and conditions that apply to all transactions. A default contract is required for all stores.

default database client interface copy
See default IBM database client interface copy.

default DB2 copy
The DB2 copy that is used by applications that access DB2 database products through the default interface. Multiple DB2 copies can be installed and run on the same system.

default delivery
The method of delivering messages to a message queue without interrupting the job, and sending the system-assigned reply for any messages requiring a reply. Messages are placed on the message queue only if the message queue is QSYSOPR; otherwise, the messages are discarded by the system. For messages requiring a reply, replies are sent before the messages are discarded.

default device
The device attached to your computer (such as a printer or disk drive) that is used when no alternative is specified by the operator.

default device geometry
A part of the storage management subsystem (SMS) base configuration that identifies the number of bytes per track and the number of tracks per cylinder for the purpose of converting space requests made in tracks or cylinders into bytes. Default device geometry is used when no unit name has been specified.

default directory
The directory name supplied by the operating system if none is specified.

default drawing attribute
In architecture, a drawing attribute adopted at the beginning of a drawing process and usually at the beginning of each root segment that is processed. See also current drawing attribute.

default drawing control
In architecture, a drawing control adopted at the start of a drawing process and usually at the start of each root segment that is processed. See also current drawing control, root segment.

default drive
The drive name supplied by the operating system if none is specified.

default entry point
An entry point in a user's program that receives control from the operating system when a user runs an application.

default envelope
A version of the document envelope that is used by Sterling B2B Integrator.

default error handler
The part of the RPG logic cycle that handles program or file exceptions/errors when program or file exceptions/errors are not controlled by the programmer.

default file
Data file in which resource default values are stored in ASCII form to permit the assignment of alternative resource values at run time without need for rewriting or recompiling source code.

default focal point

  1. A focal point that provides management services support for those nodes that have not been assigned a focal point. The set of nodes in the sphere of control (SOC) of a default focal point is not defined at either the focal point itself or the SOC nodes. A default focal point exchanges management services capabilities with all network nodes known to it; only those nodes that have not established a relationship with another focal point accept the request. See also assigned focal point.
  2. In SNA, a network node that receives alerts from nodes that do not have defined focal points. See also primary focal point.

default form

  1. A QMF form that is created when a saved form is not specified on the RUN QUERY command.
  2. A temporary object that contains the description of the format of a printed or displayed report, which was built without explicitly specifying a form to be applied against it.

default group
In RACF, the group specified in a user profile that is the default current connect group. See also current connect group.

default IBM database client interface copy (default database client interface copy)
The copy that applications requiring the use of the IBM Data Server Driver for ODBC and CLI and the IBM Data Server Provider for .NET use by default.

default indicator
In architecture, a field whose bits are all B'1', indicating that a hierarchical default value is to be used. The value can be specified by an external parameter.

default initialization
The initial value assigned to a data object by the compiler if no initial value is specified by the programmer. In C language, external and static variables receive a default initialization of zero, while the default initialization for auto and register variables is undefined.

default interface
An interface with a well-known name that applications specify when using DB2 databases.

default literal
In MFS, a literal field that MFS inserts into an input message when no data for the field is received from the terminal. See also explicit literal, literal field, system literal.

default management class

  1. A part of the storage management subsystem (SMS) base configuration that identifies the management class for system-managed data sets that do not have a management class assigned.
  2. A management class that is assigned to a policy set. This class is used to govern backed up or archived files when a file is not explicitly associated with a specific management class through the include-exclude list.

default namespace
The namespace that is applied if an XML element, type, or function has no namespace prefix. If the URI reference in a default namespace declaration is empty, unprefixed elements in the scope of the declaration are not considered to be in any namespace.

default network message queue
A message queue to which messages related to network activity are sent when either the user profile does not have a message queue specified or the message queue named in the user profile cannot be used.

default network output queue
An output queue to which spooled files are sent when either the user does not have an output queue specified or the output queue name in the user profile cannot be used.

default object
A definition of an object (for example, a queue) with all attributes defined. If a user defines an object but does not specify all possible attributes for that object, the queue manager uses default attributes in place of any that were not specified.

default organization
The organizational entity that is used when a user registers and does not identify an organizational entity. In addition, guest users are created under the default organization.

default password
A password that is the same as the service tools user ID. For example, the IBM-supplied QSECOFR service tools user ID is shipped with a default password of QSECOFR.

default policy
In a Tivoli environment, a set of resource property values that are assigned to a resource when the resource is created.

default portal page
The page that displays to a user at initial portal deployment and before the user completes enrollment. Sometimes used as a synonym for home page.

default printer
A printer that is assigned to a system or user and accepts all the printed output from that system or user, if no other printer is specified.

default profile
The profile that is assigned ownership of an object if the original owning profile is deleted or damaged.

default program
A user-specified program that is assumed when no other program is specifically named on a debug command, or a user-defined program for handling error messages.

default public place
A place whose membership automatically includes all users and which appears in the Places selector for every user. A user is always a member of this place.

default qualifier
A unique prefix used to identify unqualified table names.

default question
A question that is asked of all applicants, regardless of the job applied for. See also knockout question.

default record
A record that consists entirely of default values (numeric fields are filled with zeros; character fields are filled with blanks; and fields of either data type (numeric or character) can be filled with a value specified by the user with the DFT keyword in DDS).

default rendering
The method used by HATS to render parts of the host screen for which no specific transformation is specified.

default reply
A system-assigned reply to an inquiry or notify message, which is used when the message queue at which the message arrives is in default delivery mode.

default retention
The phase retention period that applies if either no alternate retention periods are specified or if the entity does not meet any alternate retention conditions.

default routing entry
In SNADS, the routing table entry specifying the route to be used when the table contains no explicit routing entry.

default security
The security assigned to an object by pre-defined settings.

default shell
In AIXwindows, the shell that is used when no other shell properties have been specified.

default SSCP list
In VTAM, a list of system services control points (SSCPs) to which a session request can be routed when an LU's owning cross-domain resource manager (CDRM) is not specified. This list is filed as part of an adjacent SSCP table in the VTAM definition library.

default SSCP selection
A VTAM function that uses the default SSCP list to select a set of one or more system services control points (SSCPs) to which a session request can be routed when an LU's owning cross-domain resource manager (CDRM) is not specified.

default storage pool
The storage pool to which a newly created volume is assigned.

default subsystem name (DSN)
The name of the DB2 subsystem that can connect to the control server (the default subsystem name is DSN).

default system control area (DSCA)
In MFS, part of the device output format (DOF) that causes specific terminal functions to be performed if the destination terminal has the required features. See also system control area.

default terminal security
The basic system security that prohibits the entry of certain commands from any terminal other than the master terminal.

default unit
A part of the storage management subsystem (SMS) base configuration that identifies an esoteric (such as SYSDA) or generic (such as 3390) device name. If a user omits the UNIT parameter in the job control language (JCL) or the dynamic allocation equivalent, SMS applies the default unit if the data set has a disposition of MOD or NEW and is not system-managed.

default user
The user whose security attributes are used to protect CICS resources in the absence of other, more specific, user identification. For example, except in the case of terminals defined with preset security, the security attributes of the default user are assigned to terminal users who do not sign on.

default user name
A system-provided name for a user identification for a computer system that does not want to require separate user identifications.

default user pool
A storage pool that stores file data that SAN File System has not assigned (using the active policy set) to a user pool. There is only one default user pool; however, you can assign any user storage pool as the default pool. See also user pool.

default value

  1. A predetermined value, attribute, or option that is assumed when no other value is specified. A default value can be defined for column data in DB2 tables by specifying the DEFAULT keyword in an SQL statement that changes data (such as INSERT, UPDATE, and MERGE).
  2. A value that is automatically assigned.

default value formula
The formula that lets users set an initial value for an editable field.

default version
A copy of a resource, such as a service configuration, saved in Sterling B2B Integrator that the system uses for processing unless otherwise specified.

default view
The view displayed the first time a user opens a Notes database.


  1. A project element that allows stakeholders to track bugs and bug fixes.
  2. A type of change request that identifies an anomaly or flaw in a work product. See also change request.

defect aging
A report that helps track patterns in defects, which can be used to take corrective action for reducing both defect resolution time and number of defects.

defect arrival rate
A report that shows the frequency of new defect submissions over time, categorized by severity.

defect density
The ratio of the number of defects to the program length.

defect report
A document reporting on any flaw in a component or system that can cause the component or system to fail to perform its required function. (ISTQB)

Defense Advanced Research Projects Agency (DARPA)
The United States Department of Defense agency responsible for creating ARPANET, a large TCP/IP network.

Defense Data Network (DDN)
The MILNET, ARPANET, and TCP/IP networks and protocols.

defensibly disposable
Pertaining to a record or container that is tagged for legally-mandated deletion by using a basic disposition schedule.

deferred connection
A pending event that is activated when a CICS subsystem tries to connect to IBM MQ for z/OS before it has started.

deferred control word
In DCF, a SCRIPT/VS control word that is processed after the text has been placed on the page.

deferred embedded SQL
SQL statements that are neither fully static nor fully dynamic. Like static statements, they are embedded within an application, but like dynamic statements, they are prepared during the execution of an application. See also dynamic SQL, incremental bind statement, static SQL.

deferred index cleanup rollout
A rollout in which index cleanup is performed after the deletion of the portion of the MDC table is complete. Deferred index cleanup rollout is significantly faster than immediate index cleanup rollout, but rolled-out blocks are not available for immediate reuse. See also rollout.

deferred maintenance
The process of waiting until the system can be powered down to repair or replace a failed disk-related hardware component.

deferred printing
Printing in which the print file or print data set is queued to print at a later time.

deferred printing mode
A printing mode that spools output through JES to a data set instead of printing it immediately. Output is controlled using job control language (JCL) statements. See also direct printing mode.

deferred restart
A restart performed by the system when a user resubmits a job. The operator submits the restart deck to the system through a system input reader. See also automatic restart, checkpoint restart.

deferred work element (DWE)

  1. A work element created and placed on a chain (the DWE chain) to save information about an event that must be completed before task termination but that is not completed at the present time. DWEs are also used to save information about work to be backed out in case of an abend.
  2. The catalyst used to call event-driven services controlled within CICS. A DWE causes a unit of work to be scheduled later, normally at the end of the task or just before or after syncpoint.

deferred write
The process of asynchronously writing changed data pages to disk.

A value that shows the cost savings that the system applied to an LTL shipment, based on weight breaks. If it will reduce the cost, the system returns the minimum charge from the next highest weight range.

defined address
A named set of a) Internet Protocol (IP) addresses, or b) interface names and point-to-point profiles. This set is classified as trusted, untrusted, or border.

defined state
The state a device is put into when its defined method is run or when an available device's unconfigure method is run. The device is not a usable device at this point.

defined user ID
See defined user identifier.

defined user identifier (defined user ID)
A user identifier (user ID) named on a DEFINE PROCESS or DEFINE ACTIVITY command. It specifies the user ID under whose authority the process or activity will be run, if it is activated by a RUN command.

defined zone configuration
The complete set of all zone objects that are defined in the fabric. The defined zone configuration can include multiple zone configurations. See also enabled zone configuration, zone configuration.

define method
Used to create a device instance in the ODM Customized Database. It takes a device from the undefined or nonexistent state to the defined state.

define statement
A preprocessor statement that causes the preprocessor to replace an identifier or macro call with specified code.

defining attribute
A property of an item in an online store such as its color or size. Defining attributes are used for SKU resolution. See also descriptive attribute, item.

definite response (DR)
In SNA, a value in the response-requested field of the request header that directs the receiver of the request to return a response unconditionally, whether positive or negative, to that request. See also exception response, no response.

A declaration that reserves storage and can provide an initial value for a data object or define a function.

definition file
A file that defines the content that is displayed within the navigation and work area frames.

definition signature
In a CICS resource, information about when, how, and by whom the resource was defined or last changed. See also resource signature.

definition specification
In RPG, a specification used for data definitions. This specification includes defining the following: data structures, data-structure subfields, named constants, arrays, and stand-alone fields.

definition statement
In VTAM, a statement that describes an element of the network. See also keyword operand, operand, positional operand, suboperand.

definition statement identifier
A specific character string that identifies the purpose of a definition statement.

definitive media library (DML)
A logical representation of one or more locations where all quality controlled versions of all media configuration items (CIs) are held in their definitive form, together with any associated CIs such as license and other documentation.

definitive package
A string of data that serves as the primary method for identifying the presence of software on a computer.

The process of running a software utility to rewrite fragmented data to contiguous sectors of a computer storage medium to improve access and retrieval time. See also fragmentation.


  1. In NetDA/2, the maximum number of attachments (such as links, Ethernet connections, or token-ring connections) that a node can have. For example, if a node can have six attachments, that node has a degree of 6.
  2. A measure of how many direct relationships an entity has with other entities on an association chart. Degree is one of the centrality measures used in social network analysis. See also centrality, root entity.
  3. The number of children of a node.

degree of parallelism
The number of concurrently executed operations that are initiated to process a query.

degrees of freedom
A value that is associated with a statistical test that is used in determining the p-value or observed significance level.

degrees of separation
A measurement of the relationship between two entities. The measurement is a positive integer greater than zero that defines the minimum number of entities that are involved in a chain of relationships not including the root entity. For example, if two entities are related, those entities are 1-degree separated, and have a 1-degree relationship. See also relationship.

The act of breaking kits into individual components. Dekitting is performed on kits in inventory that are no longer required. For example, inventory left over from a seasonal promotion may be dekitted and the components can be used in other kits or sold individually.

See delete character.

delay characteristic
The average amount of time required for an operation (such as call setup, call clearing, data transfer, and so forth) to be performed on a packet-switching network.

delay characteristics
The average amount of time that it takes for operations such as call setup, call clearing, and data transfer to be performed on a packet switching network.

delay compensation
In CCP, a responding arrangement by which the IBM 3710 Network Controller answers for a receiving station.

delayed fallback timer
A timer that can be configured to let the resource group fall back to a higher-priority node at a specified date or on a recurring basis. The delayed fallback timer is an attribute of a resource group. See also resource group, resource group policies, settling time.

delayed maintenance
A method of logging changes to an access path for database files and applying the changes the next time the file is opened instead of rebuilding the access path completely or maintaining it immediately. See also immediate maintenance, rebuild maintenance.

delayed port
A port that is enabled like a shared port except that the login herald is not displayed until you type one or more characters (usually carriage returns). A port directly connected to a remote system or intelligent modem is usually enabled as a delayed port.

delayed reauthorization
Payment configuration options that control the number of authorizations that can occur within the order cycle.

delayed-request mode
In SNA, an operational mode in which the sender may continue sending request units on the normal flow after sending a definite-response request chain on that flow, without waiting to receive the response to that chain. See also delayed-response mode. See also immediate-request mode.

delayed-response mode
In SNA, an operational mode in which the receiver of request units can return responses to the sender in a sequence different from that in which the units were sent. An exception is the response to a CHASE request, which is returned only after all responses to requests that were sent before the CHASE have been returned. See also immediate-response mode.

delay start
A procedure used with some channel associated signaling protocols to indicate when a switch or PABX is ready to accept address signaling. After seizure, the switch sends off-hook until it's ready to accept address signaling, at which time it sends on-hook. See also immediate start, wink start.


  1. To assign all or a subset of manager privileges to a user. To designate a user to approve requests or provide information for requests for another user.
  2. A user who is authorized to work for another user.

delegated resource
A general resource that is eligible to be accessed by specially programmed applications that request RACF to check the daemon or application's authority for a resource when the client's authority is insufficient. See also nested accessor environment element.


  1. The process of propagating a security identity from a caller to a called object. According to the Java Platform, Enterprise Edition (Java EE) specification, a servlet and an enterprise bean can propagate either the client identity when invoking enterprise beans, or can use another specified identity as indicated in the corresponding deployment descriptor.
  2. The act of giving other users or groups the authority to perform operations.
  3. The act of an owner of a mail file allowing someone else to manage the mail file, for example, to send email on behalf of the owner.

To mark an item to be purged from the database.

delete authority
A data authority that allows the user to remove entries from an object; for example, delete messages from a message queue or delete records from a file. See also add authority.

In DFSMShsm, the space management technique of deleting data sets, not managed by the storage management subsystem (SMS), that have not been opened for a specified number of days.

delete character (DEL)
A character that identifies a record to be removed from a file.

In SQL, a property of a table that is a dependent of table P or a dependent of a table to which delete operations from table P cascade.

delete hole
A row in the result of a SELECT statement of a cursor that no longer has a corresponding row in the base table because that row was deleted. The row for the SELECT statement is no longer accessible though the cursor. See also hole, update hole.

delete lock
Lock acquired by CICS file control whenever a DELETE, WRITE, or WRITE MASSINSERT operation is being performed for a recoverable VSAM KSDS or a recoverable path over a KSDS.

delete rule
A rule associated with a referential constraint that either restricts the deletion of a parent row or specifies the effect of such a deletion on the dependent rows.

delete trigger
A trigger that is activated by a delete operation on the table or view that is specified in the trigger definition. See also insert trigger, instead of trigger, trigger, update trigger.

deletion stub
A truncated document that is left in a Notes database in place of the original document to indicate to the Replication task that the document should, in fact, be deleted from all other replicas.

delimited format
Data that has data objects that are separated by delimiters.

delimited identifier
A sequence of one or more characters enclosed by quotation marks ("").

delimited scope statement
In COBOL, any statement that includes its explicit scope terminator.

delimited segment
A variable-length segment that uses separator characters to mark the beginning of groups, segments, or fields.

delimited text
A simple file format that consists of text separated into meaningful chunks by specific characters. The chunks of text are typically individual fields. The specific character is called a delimiter, and can be any character that is not found in the text. Comma and tab are common delimiters. If the delimiter is used as a character in the text, it must be enclosed by a pair of text qualifiers, usually double quotation marks.


  1. A character, such as comma or tab, used to group or separate units of text by marking the boundary between them.
  2. A flag that is formed by a character or a sequence of characters to group or separate items of data by marking the beginning and end of a unit of data. The delimiter is not a part of the flagged unit of data.

delimiter token
A string constant, a delimited identifier, an operator symbol, or any of the special characters shown in syntax diagrams.


  1. To add changes to a stream, or make them available to be accepted into a stream.
  2. In source control management, to conduct an outgoing flow of change sets and baselines from a repository workspace to a stream or to another repository workspace.

The likelihood of an email arriving in a recipient's inbox.


  1. An output from a process that has a value, material or otherwise, to a customer or other stakeholder.
  2. Any measurable, tangible, verifiable outcome, result or item that must be produced to complete a project or part of a project. Often used more narrowly in reference to an external deliverable, which is a deliverable that is subject to approval by the project sponsor or customer.

deliverable acceptance certificate
This certificate is input for the phase exit review for the customer. Once signed by the customer's project development team leader (PDTL) and IGS's solution project manager (SPM), it confirms and identifies the completion of deliverables as specified in the statement of work (SOW) for that phase.

delivery agent
An agent that runs external programs on messages that are sent and received.

delivery center
A site in a global network of IBM centers that provides information technology services to clients to standardize and innovate their business processes.

delivery channel
A trading partner set-up that links a document exchange record and a transport record.

delivery code
A unique identifier for the entity that pays for the transportation costs.

delivery-confirmation bit (D-bit)
In X.25 communications, the bit in a data packet or call-request packet that is set to 1 if end-to-end acknowledgment (delivery confirmation) is required from the recipient.

delivery constraint
A constraint that lets the buyer take into account the delivery date proposed by a supplier when analyzing bids. By means of a delivery constraint, a buyer can set a range of acceptable dates for delivery, and assign a per day penalty for either late or early delivery.

Delivery Duty Paid (DDP)
A trade contract arrangement where the supplier is responsible for customs clearance.

delivery item
A service item that is typically provided by selling organizations for products that are heavy, oversized or fragile and cannot be transported by common carriers.

delivery module
A software module used to deliver data to a variety of target systems, such as relational databases. See also dimension delivery module, fact delivery module.

delivery module property
A property that can be used to configure a delivery module. For example, the relational table delivery module has a property that corresponds to the commit interval.

delivery node
The location where a product is being delivered using last mile service.

delivery node determination
The process used to determine the location from which a delivery is made.

delivery operation
A ClearCase operation in which developers merge the work from their own development streams to the project's integration stream or to a feature-specific development stream. If required, the deliver operation invokes the Merge Manager to merge versions.

delivery plan
A complete sequence of movements needed to deliver one or more orders from one or multiple origins to one or multiple destinations.

delivery profile
A profile that specifies where and how to deliver alerts and data feeds to the user.

Delivery Project Executive (DPE)
A lead delivery representative who is responsible for all delivery aspects of a contract including customer satisfaction, delivery excellence, account growth, and profit attainment, with service delivery as the primary responsibility.

delivery rule
A list of criteria by which processing of messages is performed.

delivery service
A service typically provided by selling organizations for products that are heavy, oversized or fragile and cannot be transported by common carriers. These products may also require special handling which requires special equipment or personnel.

delivery service calendar
A business calendar that specifically defines the working hours, called shifts, for any given day in which delivery services can be completed.


  1. Data or other content that has changed since a previous benchmark.
  2. A difference, or an incremental value, between two instances.

delta backup
A copy of all database data that has changed since the last successful backup (full, incremental, or delta) of the table space in question. A delta backup is also known as a differential, or noncumulative, backup image. The predecessor of a delta backup image is the most recent successful backup that contains a copy of each of the table spaces in the delta backup image.

delta business object
A business object used in an update operation. Such a business object contains only key values and the values to be changed. See also after-image.

delta channel (D-channel)
In ISDN, a common channel used for signaling and management of the network. In a basic rate interface, the D-channel operates at 16 kilobits per second. In a primary rate interface, the D-channel operates at 64 kilobits per second. See also bearer channel.

delta compression
See delta encoding.

delta deployment
Deployment of only that data that is required to transform a current runtime environment into a target runtime environment. See also full deployment.

DELTA disk
The virtual disk in a VM operating system that contains program temporary fixes (PTFs) that have been installed but not merged. See also BASE disk, MERGE disk.

delta encoding
A way of storing or transmitting data in the form of differences between sequential data rather than in the form of complete files. See also data deduplication.

delta index build
In an enterprise search system, the process of adding new information to an existing index. See also main index build.

delta install
The process of creating the software package that contains only the delta between the base software package and the software package to be installed. See also byte-level differencing.

demand-activated logical link
A logical link that can be activated by APPN configuration services when needed without requiring operator intervention.

demand curve
The demand for a product over a price range across time.

demand driver
A business item or unit that captures space class, space standard, functional role, worker type, and demand category into one record that provides insight into how spaces are classified. Demand drivers are used in forecasting for capacity and size.

demand group
A collection of products with a high cross elasticity. The price and promotion of one item in the group directly affects that demand for the other items.

demand maintenance
See corrective maintenance.

demand migration
The process that is used to respond to an out-of-space condition on a file system for which hierarchical storage management (HSM) is active. Files are migrated to server storage until space usage drops to the low threshold that was set for the file system. If the high threshold and low threshold are the same, one file is migrated. See also automatic migration, selective migration, threshold migration.

demand poll
A polling operation initiated by the user.

demand select job
A job created by MVS and passed to JES3 for processing.

demand signal repository (DSR)
A connected, socially-engaged, and self-informed customer who drives businesses to adopt omni-channel and customer-centric solutions.

The conversion of mangled C++ names back to their original source code names to make program debugging easier. See also mangling.

See unmarshal.

demilitarized zone (DMZ)
A configuration that includes multiple firewalls to add layers of protection between a corporate intranet and a public network, such as the Internet.

To return the frequency of a signal to its original level.

demonstration certificate
A digital certificate issued exclusively for demonstration and test purposes. The private key for a demonstration certificate is commonly available.


  1. To remove a logical data unit from cache memory. A storage server demotes a data unit to create space for other logical data units in the cache or because the logical data unit is not valid. The ESS must destage logical data units with active write units before they can be demoted.
  2. To move an object to an earlier state or version, for example, to demote a major version with the status "released" into a minor version with the status "in process." In this case, the status of the previous major version is changed from "superseded" to "released."

The process of one host losing level functions to another. Both original and promoted hosts can be demoted. See also level function, promotion.

Software that is made available for free in a version that has limitations on its use.

denial-of-service attack (DoS)
In computer security, an assault on a network that brings down one or more hosts on a network such that the host is unable to perform its functions properly. Network service is interrupted for some period.

denied cookie
A cookie whose information will not be available to store and pass back to the specified domain.

The intentional duplication of columns in multiple tables to increase data redundancy. Denormalization is sometimes used to improve performance. See also normalization.

To put normalized data in a physical location and structure that is optimized for performance and data analysis. See also normalize.

denormal number
See subnormal number.

dense dimension
A dimension in a multidimensional database that has a high probability for occupying one or more data points in every combination of dimensions that occurs. For example, in a typical multidimensional database, the measures dimension is dense since it contains accounts data (for example, quantity sold, cost of goods sold, and so on) and since accounts data exists for virtually all products in all markets. See also sparse dimension.

dense wavelength division multiplexing (DWDM)
A technology that places many optical signals onto one single-mode fiber using slightly different optical frequencies. DWDM enables many data streams to be transferred in parallel.

In printing, refers to the number of characters per inch horizontally.

density grid
A color-coded grid on a map that highlights areas where there are concentrations of items.

departmental report
A formatted document that contains jurisdiction-specific information used within a law enforcement department.

dependencies linker
An extension to the link wizard that allows dependencies to be created between particular model elements.


  1. A requirement that one managed resource has on another managed resource in order to operate correctly.
  2. A relationship that allows a module to use artifacts from a library or that allows a process application to use artifacts from a toolkit. A toolkit can also have a dependency on another toolkit.
  3. A prerequisite that must be satisfied before a job or job stream can start. See also follows dependency, resource dependency.
  4. A link between interrelated projects activities. Activities with these links depend on the start and finish dates of at least one other element and therefore cannot be completed without taking the other into consideration.
  5. A contingency between groups, where one requires some form of support from the other to achieve a result. For example, a brand may have a dependency on information systems to provide the capability for the direct sales force to price and order a new offering if the brand's promise of value cannot be fulfilled without this support.
  6. A relationship between two operations in which the status or the return code of the first operation determines the starting of the second operation. See also external dependency.
  7. A file, such as a copybook or an include file, that is required for a COBOL or PL/I program to compile properly.

dependency build
A build definition that saves time and system resources by only building artifacts that need to be rebuilt based on what has changed since the last successful build. Changes to a program's source or dependencies, and deletion or modification of a program's output will be detected and cause the program to be rebuilt.

dependency graph
Graphical representation of the dependencies in a program or project.

dependency line
The first line of an entry in a description file. It contains a list of target files followed by a colon and an optional list of prerequisite files or dependencies.

dependency relationship
In UML modeling, a relationship in which changes to one model element (the supplier) impact another model element (the client). See also realization relationship.


  1. An Ada-language compilation unit that requires recompilation if another unit were to be recompiled because of the compilation order imposed by the Ada language.
  2. In SQL, an object (row, table, or table space) that has at least one parent. See also parent table space.

dependent file
The file in a constraint relationship that contains the foreign key. See also parent file.

dependent fileset
A fileset that shares the inode space of an existing independent fileset.

dependent foreign key table
A foreign key table that is a dependent in at least one referential constraint. See also descendent foreign key table, parent table.

dependent immediate materialized query table
A table whose definition is based on the result of a query and whose data is in the form of precomputed results. These results come from the tables or nicknames that are used in the definition of the materialized query table.

dependent job control (DJC)
A method of handling multiple jobs that must be run in a specific order because of job dependencies. DJC manages jobs that are dependent upon one another.

dependent job control network (DJC network)
A set of jobs that JES3 must run in a predetermined order. Success or failure of one job can result in execution, holding, or cancellation of other jobs.

dependent logical unit (DLU)
A logical unit that requires assistance from a system services control point (SSCP) to instantiate an LU-to-LU session. See also independent logical unit.

dependent logical unit requester (DLUR)
An advanced program-to-program communications (APPC) application that allows dependent secondary logical units (LU 0, 1, 2, and 3) an entry point into the Advanced Peer-to-Peer Networking (APPN) network. DLUR support gives the appearance of having an adjacent connection to VTAM, but allows traversing the APPN network through intermediate nodes.

dependent LU requester (DLUR)
An APPN end node or network node that (a) owns dependent LUs in its local node or in adjacently attached nodes and (b) obtains SSCP services for these dependent LUs from a dependent LU server (DLUS) located elsewhere in an APPN network. The flows of SSCP services between DLUR and DLUS are encapsulated in APPN formats and carried over a special pair of LU 6.2 sessions (referred to as a CP-SVR pipe).

dependent LU server (DLUS)
An APPN network node that provides SSCP services for dependent LUs owned by dependent LU requesters (DLURs) located elsewhere in an APPN network.

dependent materialized query table
A materialized query table that is dependent on a given table.

dependent price list
A price list that inherits price information from a master price list.

dependent region

  1. In a multi-MVS configuration, a region that receives commands from a master or coordinator region at takeover time. It cannot initiate a takeover.
  2. An address space, managed by the IMS control region, where IMS application programs run. Dependent region types are MPP, BMP, IFP, JMP, and JBP.

dependent resource groups
A relationship between two or more resource groups that can be specified to control the timing of events or the location of the resource groups. Clusters with dependent resource groups allow multitiered applications to be included in resource groups. See also active configuration directory, child resource group, location dependency, multitiered application, parent resource group, resource group, resource group policies.

dependent row
A row that contains a foreign key that matches the value of a parent key in the parent row. The foreign key value represents a reference from the dependent row to the parent row. See also parent row.

dependent segment
In a database, a segment that relies on a higher-level segment for its full hierarchic meaning. A child is a dependent segment of its parent. See also root segment.

dependent service element (DSE)
An element of the active IMS system that has a counterpart in the alternate IMS system, but cannot trigger a takeover on its own. z/OS, VTAM, IRLM, and the CPC are DSEs. A DSE depends on IMS to recognize a failure in its processing and request that the alternate take over its operation.

dependent staging table
The staging table for a dependent materialized query table of a given table.

dependent table
A table that is a dependent of an object. For example, a table with a foreign key is a dependent of the table containing the corresponding primary key. See also descendent table, parent table.

dependent workstation
A workstation having little or no stand-alone capability that must be connected to a host or server in order to provide any meaningful capability to the user.

dependent write
An application write that depends upon the completion of a previous application I/O operation.

dependent write operation
A write operation that must be applied in the correct order to maintain cross-volume consistency.

The process of stripping any and all personal identifiers from a person's medical records before those records move into the cloud to protect patient privacy.


  1. To make a HATS application ready for use on the server, using functions in WebSphere Application Server, after transfer has taken place. See also transfer.
  2. In Web Experience Factory, to create a WAR file for an application and install the WAR on the target server for execution by users.
  3. To place files or install software into an operational environment. See also undeploy.
  4. To send content to one or more endpoints for execution to accomplish an operation or task, for example, to install software or update a patch.
  5. To make operational the configuration and topology of the broker domain.
  6. To place files or install software into an operational environment. In Java Platform, Enterprise Edition (Java EE), this involves creating a deployment descriptor suitable to the type of application that is being deployed.
  7. To place or install an asset into an operational environment.

deployed asset
A manageable object that exists in an IT environment, such that its presence can be verified (for example, by using a discovery tool). See also authorized asset.

deployed JAR file
A generic term for a file produced from the EJB JAR file. It contains the XML deployment descriptor and enterprise bean classes from the EJB JAR file, plus additional classes generated to support the chosen EJB container.


  1. The process of moving an application (such as a report or model) to a different instance. For example, reports are often created in a test environment and then deployed to production. When an application is deployed, it is exported, transferred, and imported.
  2. The process of making WebSphere Commerce application code available for use. This process includes packaging customized commands, data beans, and enterprise beans into JAR files. The JAR files must then be installed and configured within a container.
  3. Information about content sent to one or more endpoints, a specific instance of sent content.
  4. A process that retrieves the output of a build, packages the output with configuration properties, and installs the package in a pre-defined location so that it can be tested or run. See also stage.
  5. The process of reconfiguring and reallocating resources in the managed environment. Deployment occurs in response to deployment requests, created manually by administrators or automatically by the system.
  6. The process of enabling the widespread use of a predictive analytics project within an organization.
  7. A process that installs an operating system, and possibly other applications and files, on a target computer. During a deployment, data previously stored on the hard drives of the target is deleted.
  8. The act of packaging enterprise beans into a JAR file for distribution to a container on an enterprise bean server.
  9. The process of transferring rules from a local development environment into an operational, or runtime, environment.
  10. The process of installing and configuring a software application and all its components. See also cloud deployment, on-premises deployment.

deployment archive
A file used for deployment. A deployment archive contains the data from the content store that is being moved.

deployment assistant
A computer program for packaging a snapshot of an Informix database server instance in preparation for deploying the instance.

deployment code
Additional code that enables bean implementation code written by an application developer to work in a particular EJB runtime environment. Deployment code can be generated by tools that the application server vendor supplies.

deployment configuration
The manner in which decision operations are packaged into RuleApps, managed, and then deployed to business rule applications.

deployment data
The resource files, generated during customization, that are used to create the resources for an instance.

deployment data set
A data set containing the resource files generated during customization.

deployment descriptor
An XML file that describes how to deploy a module or application by specifying configuration and container options. For example, an EJB deployment descriptor passes information to an EJB container about how to manage and control an enterprise bean.

deployment directory

  1. The directory containing the subdirectories and resource files created during customization.
  2. The directory where the published server configuration and web application are located on the machine where the application server is installed.

deployment engine
A component of Tivoli Provisioning Manager that runs workflows.

deployment environment
A collection of configured clusters, servers, and middleware that collaborate to provide an environment to host software modules. For example, a deployment environment might include a host for message destinations, a processor or sorter of business events, and administrative programs.

deployment evaluation framework (DEF)
A customizable framework that includes a survey that helps a development team learn best practices, make mid-course decisions, and share experience reports, in an agile development project.

deployment group
The collection of actions created when an operator selects more than one action for a deployment, or a baseline is deployed. See also baseline, component, deployment window, multiple action group.

deployment instruction
A set of instructions that describe how to execute the resource files, and deploy, on the runtime systems, the resources required by the instance.

deployment lead
Person responsible for ensuring the ability to deploy and enabling the execution of the re-engineered business processes and transformation solutions across all the geographies, business units, and functional lines.

deployment management
The Tivoli management discipline that addresses the automation of configuration and change management activities for the ever-evolving components of a network computing system. See also availability management, operations and administration, security management.

deployment manager

  1. A WebSphere Application Server configuration profile that manages the nodes and clusters within a cell.
  2. A server that manages and configures operations for a logical group or cell of other servers. See also subprocess.
  3. A web server used to install components and to ensure that the components are configured to communicate correctly with one another.

deployment manager profile
A WebSphere Application Server runtime environment that manages operations for a logical group, or cell, of other servers.

deployment package
A file that contains project-level information, case-level data, or both that is created by one operator for transfer to another operator that will load the file onto their copy of Interviewer.

deployment phase
A phase that includes a combination of creating the hosting environment for your applications and the deployment of those applications. This includes resolving the application’s resource dependencies, operational conditions, capacity requirements, and integrity and access constraints.

deployment plan

  1. A list of resources, configurations, and implementations required to realize the deployment of an application.
  2. A template of a virtual service definition.
  3. The segments and segment-related tasks in a deployment.

deployment policy

  1. A policy that modifies the domain or service configuration at deployment time to accommodate the environment in which the appliance operates.
  2. A policy that associates a specific bay in a BladeCenter chassis with a Remote Deployment Manager (RDM) noninteractive task. When a blade server is added to or replaced in the bay, IBM Director automatically runs the RDM task.
  3. An optional way to configure an eXtreme Scale environment based on various items, including: number of systems, servers, partitions, replicas (including type of replica), and heap sizes for each server.

deployment scheme
A specific type of task template that contains parameters for customizing a deployment on a target, and the target display screen layout. See also task template.

deployment scope
A setting in the deployment manager that determines the rules of deployment. For example, if a highly available Case Management Client application is being deployed, the deployment scope in the deployment manager must be changed.

deployment specification
A definition of what objects to move (deploy) between a source and target environment, the deployment preferences, and the archive name. Deployment specifications are used for import and export.

deployment state

  1. One of several states that a service level agreement (SLA) goes through after it is submitted.
  2. The eligibility of a deployment to run on endpoints; includes any parameters set by the operator, such as “Start at 1AM, end at 3AM.”

deployment status
Cumulative results of all targeted devices, expressed as a percentage of deployment success.

deployment task
A profile task that must be edited and run before case management solutions can be created and deployed.

deployment topology
The configuration of servers and clusters in a deployment environment and the physical and logical relationships among them.

deployment type
An indication of whether a deployment involved one action or multiple actions.

deployment utility
A computer program for deploying a snapshot of an Informix database server instance to multiple target computers.

deployment vehicle
A job or other executable file that is used to deploy resources. Each vehicle corresponds to a particular resource file.

deployment window
The period during which a deployment’s actions are eligible for execution. For example, if a Fixlet has a deployment window of 3 days and an eligible device that has been offline reports in to BigFix within the 3-day window, it gets the Fixlet. If the device comes back online after the 3-day window expires, it does not get the Fixlet. See also deployment group.

deploy phase
See deployment phase.

deploy relationship
In UML modeling, a relationship that shows the specific artifact that an instance of a single node deploys or uses.

depositor access
An access level that allows users to create documents but not read any of the documents in the Notes database.

Pertaining to an entity, such as a programming element or feature, that is supported but no longer recommended and that might become obsolete.

deprecated term
A term that is no longer approved for use. Typically, deprecated terms are replaced with a new term or a synonym. See also replaced by term.

To remove a service or component. For example, to deprovision an account means to delete an account from a resource. See also provision.


  1. In Enhanced X-Windows, the number of bits per pixel for a window or pixmap.
  2. The number of clicks required for a user, or an automatic crawler, to get from a source page to a target page.

In 3D computer graphics, varying the intensity of a line with depth. Typically, the points on the line further from the eye are darker, so the line seems to fade into the distance.

To remove items from a queue. See also enqueue.

See Distinguished Encoding Rules.

An embeddable, all Java, object-relational database management system (ORDBMS).


  1. In the C and C++ languages, to apply the unary operator * to a pointer to access the object the pointer points to. See also indirection.
  2. In VisualAge RPG, to remove information specific to the System i platform from a control.

In the hierarchical file system, to remove an underlying file system and the specific functions it supports from the application programming interface layer and to make it unavailable to user applications.

DER encoded
Pertaining to a binary form of an ASCII PEM formatted certificate. See also Base64, PEM encoded.


  1. A morphological process used to produce additional words from a canonical base form, for example: compute, computer, computerize, and recomputed.
  2. In a data source or DataStream, a value that is calculated rather than obtained directly from the source data, using an expression defined by the user.
  3. In object-oriented programming, the refinement or extension of one class from another.
  4. The process of deriving a C++ class from an existing class, called a base class.

derivation element
An element in the transformation model that is calculated rather than obtained directly from the source data, using an expression defined by the user.

derived attribute
An attribute that represents a specific aspect of another attribute. Multiple derived attributes can be defined for an attribute and these derived attributes can be assigned to different categories.

derived class
See base class.

derived data
Data that is produced by applying calculations to input data at the time the request for that data is made (that is, the data has not been pre-computed and stored in the database). See also pre-calculated data.

derived dimension element
An element in the transformation model that allows the user to use a calculated expression as the source for a dimension attribute.

derived event
See synthetic event.

derived field

  1. A variable that does not exist in a data source and is created from one or more existing fields, even across different data sources.
  2. A field that is calculated or inferred from other fields or data, such as the calculation of a customer ID by using the @INDEX sequence function in CLEM.

derived form
A query management form that was built by converting a Query definition object.

derived index
A calculated metric that provides a status and a score based on other metrics.

derived member
A member whose associated data is produced by applying calculations to input data at the time the request for that data is made.

derived name
In REXX, the stem of the symbol, in uppercase, followed by the tail in which all simple symbols have been replaced by their value. It is also the default value of a compound symbol.

derived object (DO)
A type of output created by a ClearCase build in a dynamic view.

derived order
An order that is created as a result of a parent order's necessity to communicate some portion of the order fulfillment execution to a third party. Once created, the derived order no longer maintains a reference to the parent order. Its lifecycle is independent.

derived page
One or more child pages that have a shared layout that is inherited from the properties of the parent page.

derived query
A query management query that was built by converting a Query definition object.

derived return order
A return order that is optionally derived from the corresponding sales order that is being returned fully or in part.

derived table
The set of rows returned by a subquery within a DML statement of SQL. Derived tables can be defined by simple, UNION, nested, or joined subqueries, including OUTER joins.

derived type
In Ada language, a type whose operations and values are replicas of those of an existing type.

derived variable
A variable that is created from other variables by using an expression. For example, numeric derived variable can be created to show the sum of the values that are stored in two or more other numeric variables.

See Data Encryption Standard.

DES authentication
A type of encryption algorithm that requires a client to send credentials (name, conversation key, window key, and a time stamp) to the server. The server then returns a verifier to the client. Data Encryption Standard (DES) credentials are sometimes called secure credentials because they are based on a sender's ability to encrypt data using a common time reference; a randomly generated key is required to encrypt a common reference time that is then used to create a conversation key.

descendant category
A related category at a lower level in a dimension.

descendant classification
All of the classifications that follow a classification within a hierarchy.

An object that is a dependent of another object or is a dependent of an object that is in turn a dependent of another object.

descendent foreign key table

  1. A dependent foreign key table of a given table.
  2. A dependent foreign key table of a descendent foreign key table of a given table. See also dependent foreign key table.

descendent immediate materialized query table
A descendent materialized query table that is defined with the REFRESH IMMEDIATE option.

descendent materialized query table

  1. A dependent materialized query table of a given table.
  2. A dependent materialized query table of a descendent foreign key table of a given table.

descendent row
A row that is a dependent of another row or is a descendent of a dependent of another row.

descendent staging table

  1. A dependent staging table of a given table.
  2. A dependent staging table of a descendent foreign key table of a given table.

descendent table
A table that has a dependent relationship on a parent table or on another descendent table. See also dependent table.

The part of lowercase letters (such as y, p, and q) that descends below the baseline of the other lowercase letters. In some typefaces, the uppercase J and Q also descend below the baseline. See also ascender.

descender depth

  1. The distance from the character baseline to the bottom of a character box. For both bounded-box fonts and unbounded-box fonts, the descender depth is the number of pels between the bottommost toned pel and the character baseline, including the bottommost toned pel. The value may differ for different characters in a given font. A negative value for descender depth signifies that all of the character box is above the character baseline. See also ascender height.
  2. The character shape's most negative character coordinate system Y-axis value.

descending key
The values by which data is arranged from the highest value to the lowest value of the key field, in accordance with the rules for comparing data items. See also ascending key.

descending key sequence
The arrangement of data in order from the highest value of the key field to the lowest value of the key field. See also ascending key sequence.

descending sequence
The arrangement of data in order from the highest value to the lowest value, according to the rules for comparing data. See also ascending sequence.

descriptive analytics
A set of technologies and processes that use data to understand and analyze past business performance.

descriptive attribute
An additional description for an item. Descriptive attributes are not used for SKU resolution. See also defining attribute.

descriptive text
User-written text that describes the operation. This text is also issued as part of the write-to-operator message if the operation has been started, exceeds its deadline, and has the deadline write-to-operator (WTO) option specified.


  1. In the DCE X/Open Directory Service, a defined data structure that is used to represent an OM attribute type and a single value.
  2. In Informix, a quoted string or variable that identifies an allocated system-descriptor area or an SQLDA structure. See also identifier, system-descriptor area.
  3. In information retrieval, a parameter word used to categorize or index information.
  4. In ODM, a named and typed variable that defines a single characteristic of an object.
  5. In Enterprise Service Tools, a property or characteristic of an instance of structured data that is a component of a screen description. At build time, these descriptors are used for screen matching. The descriptors are also used for screen recognition purposes in the deployed service.
  6. In DCE X/Open Object Management, the means by which the client and service exchange an attribute value and the integers that denote its representation, type, and syntax.
  7. A small, unsigned integer that a UNIX system uses to identify an object supported by the kernel. Descriptors can represent files, pipes, sockets, and other I/O streams.
  8. A template from which an IMS control block is built.
  9. See UIMA descriptor.
  10. An XML file that describes the content of a component or resource.
  11. See screen recognition criteria.
  12. A PL/I control block that holds information such as string lengths, array subscript bounds, and area sizes, and is passed from one PL/I routine to another during run time.

The process of removing selection from a previously selected object.

A method for converting a serialized variable into object data. See also serializer.


  1. In XDR, to change from XDR format to a particular machine representation.
  2. To reconstruct an object from serialized data. See also serialize.
  3. To change from serial-by-bit to parallel-by-byte.

DE service
See directory entry service.

designated approving authority (DAA)
The official who has the authority to accept the security safeguards for an information system. The DAA may be responsible for issuing an accreditation statement that records the decision.

designated gateway SSCP
See designated gateway VTAM.

designated gateway VTAM
A gateway system services control point (SSCP) designated to perform all the gateway control functions during LU-LU session setup.

designated router

  1. A router that informs end nodes of the existence and identity of other routers. The selection of the designated router is based upon the router with the highest priority. When several routers share the highest priority, the router with the highest station address is selected.
  2. In a multiaccess OSPF network that has at least two attached routers, a router that is responsible for generating link-state advertisements (LSAs) for the entire multiaccess network and determines which routers should become adjacent. A designated router is elected by other routers using the Hello Protocol. See also backup designated router.

An optional, '-' separated list of node roles (manager, client). Indicates whether a node is part of the pool of nodes from which configuration and file system managers are selected.

design element
In a Notes database, a field, form, view, public agent, database icon, Using This Database document, or About This Database document.

design environment
The location where users define events, interaction points, smart segments, and treatment rules. After configuration, they can be deployed to the runtime environment.

One of several components that authorized users can run to create reusable, generally available searches, workflow definitions, workflow subscriptions, and templates for searching, publishing, and document entry. Site preferences control access to the designers.

designer access
An access level with which users can compose, read, and edit any documents, plus modify the database icon, About and Using documents, and all design elements. Servers can replicate all of the above and, if they have delete access, deletions.

design metric
A measurement (metric) that describes the characters in a font, or the recommendations of a font designer. Examples are height, width, and character increment for each character of the font uppercase height and maximum baseline extent for the font as a whole.

design object store
The object store in which solutions are stored in a development environment that is typically in a dedicated IBM FileNet P8 domain.

design pane
In Domino Designer, the workspace area that displays design options, as well as areas to enter design information.

design pattern
A scheme for refining the subsystems or components of a software system, or the relationships between them. A design pattern describes a commonly recurring structure of communicating components that solves a general design problem within a particular context.

design size
The size of the unit Em for a font. All relative font measurement values are expressed as a proportion of the design size. For example, the width of the letter I can be specified as one-fourth of the design size.

design template
A Notes database design that lets users share design elements among databases and store design elements with a template. The template can be enabled so that when it changes, the change automatically occurs in all databases created with that template.

Design Thinking
A process for envisioning the user experience that involves diverging and converging on solutions. IBM Design Thinking adds three core practices (hills, sponsor users and playbacks) to the design thinking methods.

design window
In VisualAge RPG, the window in the GUI design tool suite on which parts are placed to create a user interface.

desired output
The output that is required for a given input. For example, 0 psi input = 4 mA output.

desired state
The state that a user wants an object to have.

desired state management
The process of verifying that devices are at the desired state and taking actions in order to achieve that state.

A visual representation of a group of objects in a system that helps a user to interact with and perform operations on a computer system.

desktop collection
The process by which users' desktops are collected, indexed, and then added as an available volume within IBM StoredIQ.

desktop form template document class
A class that is used when adding a desktop form template (with the .itp file extension) to an object store. See also document class, form template.

Desktop Management Interface (DMI)
A protocol-independent set of application programming interfaces (APIs) that were defined by the Distributed Management Task Force (DMTF). These interfaces give management application programs standardized access to information about hardware and software in a system.

desktop plug-in
A plug-in for Microsoft Office that lets users access Connections from Office and Outlook to upload files to the Files application from their desktops.

desktop pool
A collection of virtual desktops of similar configuration intended to be used by a designated group of users.

desktop publishing (DTP)
The process of producing high-quality documents from a personal computer or workstation with associated software. These systems are usually intended for stand-alone, single user environments.

Desktop Settings
A Domino policy document that applies standard settings to the Notes workspaces of users who are assigned to the policy.

See Data Exchange SPI architecture.

The process of reading records from the spool into central storage. During the despooling process, the physical track addresses of the spool records are determined.

To move data from cache to a nonvolatile storage medium.

A function of the Content Manager resource manager that moves objects from the staging area to the first step in the object's migration policy.

See destination identifier.


  1. A queue of data used with the CICS transient data facility.
  2. A copy group or management class attribute that specifies the primary storage pool to which a client file will be backed up, archived, or migrated. See also copy storage pool.
  3. An exit point that is used to deliver documents to a back-end system or a trading partner.
  4. The location or end point of a delivery.
  5. An end point to which messages are sent, such as a queue or topic.
  6. In JMS, an object that specifies where and how messages should be sent and received.
  7. In IMS Transaction Manager (TM), an application program, a logical terminal, or an operator command that is associated with the control region.
  8. See event destination.
  9. Any point or location, such as a program, node, station, printer, or a particular terminal, to which information is to be sent. See also origin.

destination address
The location to which information is to be sent. See also source address.

destination address field (DAF)
In SNA, a field in a format identification 0 or format identification 1 transmission header that contains the network address of the destination. In a format identification 2 header, the field is called destination address field prime (DAF'). See also origin address field.

destination code
A numeric code used to categorize information that is sent from a user address space to the global address space, or between the global and a local address space. A destination code can correspond to either subsystem interface function codes or internal JES3 communication.

destination control file
In a Windows environment, a user-modifiable file for simpler mapping of JCL to Infoprint Manager parameters.

destination control table (DCT)
A table describing each of the transient data destinations used in CICS. This table contains an entry for each extrapartition, intrapartition, and indirect destination.

destination cursor
A point or location marked by the cursor to which data is to be pasted or inserted.

destination disk

  1. The disk to which a program is installed.
  2. An available disk to which data can be written.

destination ID
See destination identifier.

destination identifier (destination ID, DID)

  1. The 3-byte destination ID of the destination device, in the 0xDomainAreaALPA format.
  2. The 8-character subscript on the DESTID initialization statement or command that corresponds to a combination of a first-level destination and a second-level destination that determines where data should be sent in a JES2 installation. A DESTID can be either a symbolic destination or an explicit destination. See also explicit destination, symbolic destination.

destination logical unit (DLU)
A logical unit that is the target of a Locate search request as part of a session initiation sequence. See also initiating logical unit, origin logical unit.

destination node

  1. The node to which a request or data is sent.
  2. In the OSI Communications Subsystem licensed program, a node that is the final recipient of data sent by the local node and the origin of data sent to the local node. A destination node may or may not be an adjacent node.

destination NSAP address
In OSI, an NSAP address that identifies a destination node.

destination parent
In a database, the physical or logical parent that is reached by the logical child path.

destination point code (DPC)
A code that identifies the signaling point to which an MTP signal unit is destined. Unique within a particular network.

destination port
An 8-port asynchronous adapter that serves as a connection point with a serial service.

destination queue (DSQ)
A control block that is used by subsystem interface routines to route requests (represented by destination codes) to the JES3 routines responsible for servicing the requests.

destination repository
A directory such as a network share or local disk that serves as the target location of packages that are being copied.

destination service access point

  1. In OSI, a service access point used to receive data.
  2. In SNA and TCP/IP, a logical address that allows a system to route data from a remote device to the appropriate communications support. See also source service access point.

destination subarea field (DSAF)
In SNA, the field in a network header that carries the subarea number of a data packet's destination.

destination system

  1. In an IMS multisystem environment, the system in which the logical destination resides.
  2. In SNADS, a system that can receive messages, documents or objects.

destination volume
The disk on which data will be restored.

The removal of a record and the object of the record from the system.

destructive data change
An event in which data is modified by a change operation in an application or by a trigger, and then the data is modified again by other trigger actions within the same trigger.

A special member function of a class with the same name as the class with a ~ (tilde) preceding the name. You cannot specify arguments or a return type for this function. A destructor "cleans up" after an object by doing such things as freeing any storage that was dynamically allocated when the object was created.


  1. In cross-site mirroring, to disassociate a mirror copy from the production copy to use the mirror copy for a separate operation, such as to save data, to run reports, or to perform data mining. Detaching a mirror copy suspends geographic mirroring.
  2. To de-couple an inbound identity from an entity and verify again that it should still be associated with that entity.
  3. In a multithreaded environment, to mark a thread so that the system reclaims the thread resources when the thread ends. If the thread is already ended, the resources are freed immediately.

detached copy
The mirror copy of an independent disk pool that is disassociated from the production copy in a cross-site mirroring (XSM) environment.

detached data partition
A data partition that is detached from a table but remains part of the table pending the completion of asynchronous index cleanup or integrity processing on dependent tables. Data in detached data partitions is unavailable to SQL statements. See also visible data partition.

detached dependent table
A dependent table that must be incrementally maintained after a data partition is detached using an ALTER TABLE statement.

detached index
In a table with indexes, an index that uses a fragmentation strategy that is different from the table fragmentation. See also attached index.

detached table
A table, created from a detached data partition by using an ALTER TABLE statement, that is inaccessible until all of the corresponding detached dependent tables are maintained.

detail block text
The text in the body of a report that is associated with a particular row of data.

detail calculation
In RPG, specified calculation operations that are performed for every record read.

detailed view
A format for document lists in which document properties are listed in columns.

detail heading text
The text in the heading of a report.

detail line
In RPG, a detail record in an output file.

detail member
See leaf member.

detail record

  1. A record that contains the daily activities or transactions of a business. For example, the items on a customer order are typically stored in detail records. See also header record.
  2. In RPG, an output record produced during the detail output operation of the RPG program cycle. See also total record.

detail report
In Query, a report that contains all the information produced by a query. See also summary report.

details-based set
A set based on an item and its immediate details. See also set.

details view
A standard contents view in which a small icon is combined with text to provide descriptive information about an object. The text is arranged in rows and columns so one row is for each object and one column is for each type of descriptive information displayed.

detail time
That part of the RPG program cycle in which calculation and output operations are performed for each record read. See also total time.

detail variation
A data formatting definition specified on a FORM.DETAIL panel that can be used to conditionally format a report or part of a report.

A module that allows multiple source association searches on a wide range of characteristics.

detected access transmission error in (DTSE in)
In Performance Tools, the number of times the network termination 1 (NT1) notifies the terminal equipment (TE) of an error in data crossing the U interface of the integrated services digital network (ISDN) from the line transmission termination (LT) to the NT1. The NT1 reports the errors to the TE through the maintenance channel S1.

detected access transmission error out (DTSE out)
In Performance Tools, the number of times the network termination 1 (NT1) notifies the terminal equipment (TE) of an error in data crossing the U interface of the integrated services digital network (ISDN) from the NT1 to the line transmission termination (LT). The NT1 reports the errors to the TE through the maintenance channel S1.

In the IBM 3800 Printing Subsystem, a depression or groove at specific intervals that determines exact placement of the tractor, trimming assembly, steering assembly, or paper width lever.

A value resulting from a mathematical operation on an array.

A word that qualifies the noun with respect to its reference in context or the quantity. In English, determiners may include articles ('a'; 'the'), quantifiers ('all'; 'some'), demonstratives ('this'; 'that'), possessive pronouns ('my'; 'your'), and cardinal numbers ('one'; 'two').

deterministic dictionary
A dictionary in which for a given input character you have only one transition path out of a node. Some languages require this capability to represent their vocabulary in a compact way. See also non-deterministic dictionary.

deterministic function
A user-defined function with a result that is dependent on the values of the input arguments. Successive invocations with the same input values produce the same answer.

Deutsches Institut für Normung (DIN)
The German national standards-setting organization. DIN sponsors and publishes standards deemed relevant to German interests, performs conformance tests, and certifies products. DIN is also very influential internationally, particularly in electrical and ergonomic standards.

See device description.

developed image
The image that has been exposed to the photoconductor and covered with toner by the developer.


  1. A decision management user role that is responsible for implementing the rule applications.
  2. In a document copying machine, a solution or material that is used to make the latent image visible.
  3. In printers, the unit in the process assembly that supplies a flow of developer mix (toner) over the photoconductor to develop the electrostatic image.

developer gateway system
A machine used by developers, domain experts, and others to make changes to the underlying system code. Developer gateway systems are a set of reserved compute nodes and have access to the shared file system.

Developer Kit for Java
See IBM Developer Kit for Java.

developer mix
A combination of carrier beads and toner in which the beads electrically charge the toner.

developer-style data
Simple data structures from which programmers can infer useful information.

development environment
See integration test environment.

development folder
In System Manager, a folder containing documents for a load that is being developed.

development glossary
A business glossary that contains only the categories and terms that are being created or revised as part of a configured workflow and that have not been published yet. See also published glossary.

development library
In System Manager, the library containing all or part of a product that is being developed.

development plan
A plan that describes and scopes the development work to be done to meet project requirements.

development stream
An object that determines which versions of elements appear in a development view and maintains a list of a developer's activities. The development stream configures the development view to select the versions associated with the foundation baselines plus any activities and versions that developers create after they join the project or rebase their development stream.

development system
A DirectTalk system that is not used to respond to or make 'live' calls; it is used only to develop and test applications. See also production system.

develop phase
The business transformation operations process (BTOP) phase in which the solution is developed.


  1. A temporary variation in the quantity of a special resource.
  2. An optional data structure that can be used to store the standard variations of the values for the selected event over the preceding four-week period.


  1. In the AIX operating system, a valuator, button, or the keyboard. Buttons have values of 0 or 1 (up or down); valuators return values in a range, and the keyboard returns ASCII values.
  2. An endpoint, for example, a laptop, desktop, server, or virtual machine managed by BigFix; an endpoint running the BigFix Agent.
  3. An asset, system, or component that can be tracked. This can include everything from cell phones to coffee makers, washing machines, headphones, lamps, wearable devices, and more. A device can also be a component of a machine, such as a jet engine of an airplane or the drill of an oil rig.
  4. See infrastructure.
  5. A piece of equipment such as a workstation, printer, disk drive, tape unit, or remote system.
  6. See mobile device.
  7. A component that is used for an event provider to provide location, notification, or telemetry data. Devices always belong to a hub and can be grouped in device groups.
  8. A piece of telecommunication equipment such as a cell phone.

device adapter (DA)
A physical component of the ESS that provides communication between the clusters and the storage devices. Multiple DAs are connected to the clusters in such a way that any cluster can access storage device via multiple paths, providing fault tolerance and enhanced availability. See also loop, SSA adapter.

device address
A unique identifier for each device so it is recognized by the system.

device attributes feedback area
In the C language, an area that allows a user to obtain information about a specific device.

device category
A storage device classification used by the storage management subsystem (SMS). The device categories are: SMS-managed direct access storage device (DASD), SMS-managed tape, DASD not managed by SMS, and tape not managed by SMS.

device characteristics table (DCT)
An MFS table that is generated for IBM 3270 or SLU type 2 devices with symbolic names. An entry is generated for each symbolic name and its associated screen size and physical terminal features. Different combinations of features for the same symbolic name cause separate entries in the table to be created.

device class

  1. A named set of characteristics that are applied to a group of storage devices. Each device class has a unique name and represents a device type of disk, file, optical disk, or tape.
  2. The generic name for a group of device types. For example, all display stations belong to the same device class. See also device type.

device cluster resource group
A cluster resource group that contains a list of switchable devices, such as independent disk pools which reside on a switchable entity. See also switchable entity.

device configuration
The physical placement of display stations, printers, and so forth; and the configuration descriptions that describe the physical configuration to the system and describe how the configuration will be used by the system.

Device Configuration Database
A database that stores all information relevant to support the device configuration process.

device configuration file

  1. For a server, a file that contains information about defined device classes, and, on some servers, defined libraries and drives. The information is a copy of the device configuration information in the database.
  2. For a storage agent, a file that contains the name and password of the storage agent, and information about the server that is managing the SAN-attached libraries and drives that the storage agent uses.

device connection
A component of the configurable service for a MedicalDeviceInput node that defines the connection that is used by a medical device. The device connection specifies the connection parameters and measurement set that are used by the device, and the device type.

device context
Data that is used to identify the location of a device. This data can include geographical coordinates, WiFi access points, and timestamp details. See also trigger.

device control block (DCB)
A control block that is used by access method routines in storing and retrieving data.

device control character
A control character used to specify a control function for peripheral devices associated with a system.

device-control command set
In IPDS architecture, a collection of commands used to set up a page, communicate device controls, and manager printer acknowledgment protocol

device definition
Information about a device that is in the Customized Database including attributes and connection locations.

device dependence
The reliance on the characteristics of particular types of devices used in writing and running programs or in performing functions. See also device independence.

Pertaining to a function that can be accomplished, or a program that can be run, only if particular types of devices are available. See also device-independent.

device description (DEVD)
An object that contains information describing a particular device or logical unit (LU) that is attached to the system. A device description is a description of the logical connection between two LUs (local and remote locations).

device domain
A collection of cluster nodes that share device resources, such as independent disk pools. For independent disk pools, the resources are: virtual addresses, disk pool numbers and disk unit numbers. An independent disk pool can only be accessed by the nodes in one device domain.

device driver

  1. A collection of workflows that implement logical device operations for a specific device or data center asset.
  2. A program that provides an interface between a specific real or virtual device and the application program that uses the device.

device driving system
The name given by VSE/POWER to a subsystem or application (for example, PSF) that communicates with VSE/POWER through the cross partition interface.

device emulation
The programming that allows one device to appear to the user or to a system as another device.

device enrollment
The process of a device owner registering their device as trusted.

device fencing
See device pooling.

device field (DFLD)
In MFS, the smallest area in a device input format (DIF) or device output format (DOF) whose content and structure are defined by the user.

device file
One of several types of the system object type *FILE. A device file contains a description of how data is to be presented to a program from a device or how data is to be presented to the device from the program. Devices can be display stations, printers, diskette units, tape units, or remote systems.

device group
A group of devices that are interchangeable as far as z/OS allocation is concerned. Unless a request is made for a specific device name, any device in a given device group can satisfy a request if one device in that device group can satisfy that request.

device handler
The component of a device driver that communicates directly with the hardware.

device head
The component of a device driver that implements the application program interface to a device.

device holder
The person using a BigFix-managed computer.

device identifier
An identifier that uniquely identifies a logical or physical device.

device independence
The capability to write and run programs or perform functions without regard for the physical characteristics of devices. See also device dependence.

Pertaining to a function that can be accomplished, or a program that can be executed, without regard for the characteristics of particular types of devices. See also device-dependent.

device input format (DIF)
The Message Format Service (MFS) control block that describes the format of the data that is entered on the device and presented to MFS.

device instance
A Customized Devices Object Class entry that is created when a device is defined. There is a device instance for each device defined in the system.

device interface card
A physical subunit of a storage cluster that provides the communication with the attached disk drive modules (DDMs).

device-level font resource
A device-specific font object from which a presentation device can obtain the font information required to present character images.

device location
Indicates the location path of a device. This is a field in the Customized Devices Object Class.

device management
The task of defining I/O devices to the operating system and then controlling the operation of these devices.

Device Management Enablement (DME)
See also water.

device manager

  1. In a Content Manager system, the interface between the resource manager and one or more physical devices.
  2. For complex interfaces, a collection of routines that acts as an intermediary between drivers and virtual machines. For example, supervisor calls from a virtual machine are examined by a device manager and routed to the appropriate subordinate device drivers.
  3. The subcomponent of PSF that manages the interface to the printer.

Device-Mapper Multipathing (DM Multipath)
A method used to configure multiple I/O paths among nodes and storage arrays into a single device.

device mapping file
A configuration file that defines the configuration of the SPUs and the disks within a system, specific to the model type of the system. The device mapping file is used to create and initialize the Netezza database the first time the system starts. It also communicates the device mappings to the SPUs when Netezza starts or after a topology change such as a SPU failure.

device name

  1. The symbolic name of an individual device.
  2. A name reserved by the system or a device driver that refers to a specific device. For example, the DOS device name for the parallel port is LPT1.

device number
The reference number assigned to any device.

device object
An object that provides a means of communication between a computer and another piece of equipment, such as a printer or disk drive.

device output format (DOF)
The Message Format Service (MFS) control block that describes the format of the output data that is presented to the device.

device page (DPAGE)
In MFS, a user-defined group of device field definitions that comprise one or more physical pages to be presented to or received from the device.

device parity protection
A function that protects data stored on a disk-unit subsystem from being lost because of the failure of a single disk unit in the subsystem. When a disk-unit subsystem has device parity protection and one of the disk units in the subsystem fails, the subsystem continues to run. The disk-unit subsystem reconstructs the data after the disk unit is repaired or replaced. See also checksum protection, mirrored protection, Redundant Array of Independent Disks.

device partitioning
A pool of devices (called a fence) that is used exclusively by a set of jobs in a specific job class. Using device partitioning, the device usage of an installation can be tailored to its anticipated workload.

device password
A password that controls access to a mobile device.

device pool
A collection of similar devices that a group of users can share.

device pooling
Reserving devices for use only by jobs within a specified job group, or jobs with a specified job network.

device property
Information about a device collected by BigFix, including details about its hardware, operating system, network status, settings, and BigFix client. Custom properties can also be assigned to a device.

device provider
A device-specific handler that serves as a plug-in for the Common Information Model (CIM); that is, the CIM Object Manager (CIMOM) uses the handler to interface with the device.

device queue
An ordered list of device requests that are routed to a device or device pool one at a time.

device relevance
A determination of whether a piece of BigFix content applies to applies to a device, for example, where a patch should be applied, software installed, or a baseline run. See also content relevance.

device result
The state of a deployment, including the end result, on a particular endpoint.

device selection character
In BSC, the control character that is sent to a receiving system or to a device connected to a receiving system to select that device to receive the output.

device sparing
A subsystem function that automatically copies data from a failing disk drive module (DDM) to a spare DDM. The subsystem maintains data access during the process.

device stanza
Defines a device attached to a queue in the print spooling system. A device stanza contains all information pertaining to the device (usually a printer) and is found in the /etc/qconfig file.

device state
Indicates the current configuration status of a device instance. Possible values are defined, available, and stopped. This is a field in the Customized Devices Object Class.

device subclass
A class that distinguishes devices within the same functional class. It is used to indicate different interfaces. For example, the printer class has three subclasses: rs232, rs422, and parallel.

Device Support Facilities (ICKDSF)
An IBM program used for initialization of direct access storage device (DASD) volumes and track recovery.

Device Support Module (DSM)
A configuration file that parses received events from multiple log sources and coverts them to a standard taxonomy format that can be displayed as output.

device switch table
A table that is used as an interface to the device drivers.

device table
A list of finance devices supported by a server to be used by a finance job.

device token
In the GDDM function, an 8-byte code, required to set the devices to a predefined set of hardware characteristics.

device type
The generic name for a group of devices. See also device class.

device-type logical unit
In VTAM, a logical unit that has a session limit of 1 and usually acts as the secondary end of a session. It is typically a logical unit (LU) in an SNA terminal, such as a 3270.

device-version code page
In IPDS architecture, a device version of a code page contains all of the characters that were registered for the CPGID at the time the printer was developed since then, more characters might have been added to the registry for that CPGID. A device-version code page is identified by a CPGID.

A software methodology that integrates application development and IT operations.

See Data Export Wizard.

See decision federator.

DFC layer
See data flow control layer.

Three-character prefix of all CICS modules.

A COBOL copybook containing the symbolic names for all the AID keys in CICS.

See dump utility program.

See dynamic transaction routing program.

See field definition macro.

See map definition macro.

See map set definition macro.

See sample statistics program.

See system initialization program.

See statistics utility program.

See device field.

See Data Facility Product.


  1. See Distributed File Service.
  2. See distributed file system.

See Data Facility Storage Management Subsystem.

A DFSMS functional component and a base element of z/OS that provides functions for storage management, data management, device management, and distributed data access.

A DFSMS functional component or base element of z/OS that provides data set services. DFSMSdss provides functions for copying, moving, dumping, and restoring of data sets and volumes.

DFSMS environment
See system-managed storage environment.

A DFSMS functional component or base element of z/OS that provides functions for backing up and recovering data, and managing space on volumes in the storage hierarchy.

DFSMShsm-managed volume
A storage volume that is defined to DFSMShsm. See also DFSMSrmm-managed volume, system-managed volume.

DFSMShsm-owned volume
A storage volume on which DFSMShsm stores backup versions, dump copies, or migrated data sets.

An IBM licensed program that provides the complementary functions of DFSMSdfp, DFSMSdss, DFSMShsm, and DFSMSrmm, which, together with the Resource Access Control Facility (RACF), provide a system-managed, administrator-controlled, storage environment. Functions of DFSMS/MVS are included in z/OS.

DFSMS Network File System
See z/OS Network File System.

DFSMS Optimizer Feature
A DFSMS feature that provides an analysis and reporting capability for both the storage management subsystem (SMS) and environments that do not use SMS.

A DFSMS functional component or base element of z/OS that manages removable media.

DFSMSrmm-managed volume
A tape volume that is defined to DFSMSrmm. See also DFSMShsm-managed volume, system-managed volume.

See Data Facility Sort.

See distributed function terminal.

See data file utility.

See DASD fast write.

See distributed host command facility.

See Dynamic Host Configuration Protocol.

DHCP lease
The length of time that a DHCP server allows a client to use an assigned IP address.

See Diffie-Hellman Group Exchange.

See Document Interchange Architecture.

A mark indicating a change in the phonetic value of a character or a combination of characters. See also accent mark.

diacritical weight (DW)
In cultural sort, the weight of a character that is due to its diacritic component. For example, in French, é sorts before è. See also alphanumeric weight, case weight, indifferent weight, level 2, mark weight, special weight.

DIA document distribution service
A service that allows users to send, receive, file, print, change details of, and query electronic mail.

DIAGNOSE interface
In z/VM, a programming mechanism that lets any virtual machine directly communicate with CP by way of the DIAGNOSE instruction. Specific interface codes let a virtual machine more efficiently request specific CP services.

Pertaining to the detection and isolation of an error.

diagnostic analytics
A set of technologies and processes that analyze data to determine the reasoning behind the patterns and results of descriptive analytics.

diagnostic area
A data structure that stores diagnostic information about an executed SQL statement.

diagnostic code
In X.25 communications, a 1-byte code, included in clear indication packets and reset indication packets, that gives information about the reason for sending the packet.

diagnostic message
A message that contains information about errors or possible errors. This message is generally followed by an escape message.

diagnostic mode
In printers, the operational mode in which the printer can check itself in case of a malfunction. For example, when the IBM 3935 Advanced Function Printer is in diagnostic mode, it does not accept information from the attached controlling computer system. See also print mode, test mode.

diagnostic output
Error or status messages produced by processes, in addition to those messages produced by standard output.

diagnostics table
A special table that contains information about integrity violations that were caused by the rows of a violations table. See also violations table.

A graphical representation of the logical data model or a subject area.

diagram connector
A connector that joins several segments in the same statechart to facilitate jumps to different parts of a diagram without drawing complex transitions and cluttering the statechart.


  1. A computer input device that allows a user to set parameter values.
  2. To initiate a telephone call. In telecommunication, this action is performed to establish a connection between a terminal and a telecommunication device over a switched line.
  3. An input/output device that is used to input variables by way of thumbwheels.

dial by name
To press the keys that correspond to subscribers' names rather than their telephone numbers or extensions.

dial code
A code that represents a telephone number or portion of a telephone number.

See local language.

dialed number identification service (DNIS)
In telephony, a number supplied by the public telephone network to identify a logical called party. For example, two 800 numbers might both be translated to a single real telephone number. The DNIS is sent when the real telephone number is called to allow end users to distinguish which service is being called when a call arrives to the real number.

Pertaining to the direction in which a switched connection is requested by any node or terminal other than the receiving host or an NCP.

dialing directory
In ATE, a list of telephone numbers that can be called with Asynchronous Terminal Emulation (ATE). It is similar to a page in a telephone directory.


  1. In AIXwindows, a two-way text interface between an application and its user. The interface takes the form of a collection of widgets and gadgets, including a DialogShell widget, a BulletinBoard widget (or a subclass of a BulletinBoard widget or some other container widget), plus various children, including Label, PushButton, and Text widgets.
  2. A series of related inquiries and responses between a user and an application, similar to a conversation between two people.
  3. The recorded interaction between a user and the 3270 application that the user accesses. Users can record a dialog using the Record Dialog function in the 3270 terminal service recorder. A recorded dialog includes the keystrokes, inputs and outputs that move the user from one screen to another in the 3270 application.

dialog activity
An interactive dialog with a customer created in the Management Center.

dialog box
A secondary window that solicits user input for a specific task or subtask. Common examples are the Print and Save As dialog boxes. Dialog boxes are modal; that is, they must be closed before the user can continue working in the window that launched the dialog box.

dialog editor
A 3270 terminal service development tool that enables a developer to modify the dialog that was recorded with the 3270 terminal service recorder.

dialog file
The result of recording a dialog from the 3270 terminal service recorder. The dialog file is saved to a WSDL file in the workbench.

dialog management
In OSI, a session-layer service that controls which peer application entity has permission to send.

dialog token
A doubleword token used as an identifier for a specific binder dialog.

dialog variable
In the user interface manager (UIM), an element in a panel group that is used to pass data values between two programs or between a program and a user. The values for all dialog variables in a panel group are stored in a variable pool.

Pertaining to the direction in which a switched connection is requested by a host or an NCP.

dial plan
The set of dial strings (phone numbers), routes (connections), and rules (conditions) that enable one user to place a call (using a telephone or softphone) to another user.

dial string
A numbering scheme that establishes the format (expected number and pattern of characters) for a telephone number. The dial string specifies how to interpret character sequences dialed by the user, and how to convert those sequences into a telephone number for an outbound call.

dial tone
An audible signal (call progress tone) that indicates that a device such as a PABX or central office switch is ready to accept address information (DTMF or dial pulses).

Dial-Up Networking
Microsoft software for personal computers running Windows that allows a modem to dial into a server.

dial-up number
A series of digits required to establish a connection with a remote correspondent via the public telex network.


  1. See DL/I interface block.
  2. See data interchange block.
  3. See directory information base.


  1. A set of business model definitions that specify linguistic properties such as translation, plural form, and grammatical gender of one or more terms.
  2. A list of strings that are used to filter and improve the quality of text analytics results.
  3. In data compression, a table that associates words, phrases, or data patterns with shorter tokens. The tokens replace the associated words, phrases, or data patterns when a data set is compressed.
  4. A search application component that provides spelling suggestions when misspelled words are encountered in a query.

dictionary attack
A repeated attempt to access a system by using all of the words in an exhaustive list.

dictionary builder
A utility that is used to build system and custom dictionaries. The dictionary builder takes an XML file as input.

dictionary contraction
A mechanism that is used to reduce the size of a dictionary file.

dictionary data section
One of the data sections of a CICS monitoring record written to SMF. The dictionary data section defines all the performance data that is being gathered or can be gathered during this CICS run.


  1. See direct inward dialing.
  2. See destination identifier.

didot point system
A standard printer's measurement system on which type sizes are based. A didot point is 0.0148 inch (0.376 millimeter). There are 12 didot points to a cicero.


  1. See device input format.
  2. See data interchange format.

Given two sets A and B, the set of all elements contained in A but not in B (A-B).

difference element
An element that exists in both sides of a comparison, though some of its fields or properties are different.

differencing phase
The process by which AutoPack compares before and after snapshots and generates the related action for each difference to the software package.

differential refresh
See change-capture replication.

differentiated indexing
The process of supplying specific string labels to an entry for different uses. Authors can, for example, specify the context for an entry only when it is used in a cross-product master index. The context does not appear when the entry is in the single-product index.

Differentiated Services
A quality-of-service standard between two networks that allows hosts to manage data by traffic flow.

Differentiated Services domain
A contiguous portion of the Internet over which a consistent set of Differentiated Services policies are administered. A Differentiated Services domain can represent different trust regions, different network technologies (such as cells or frames), different hosts, or even different routers.

Differentiated Services field
A six-bit field in the Internet Protocol (IP) header of a data packet that encodes the Differentiated Services code point. The field replaces the IPv4 IP header field, which is called type of service (ToS).

Diffie-Hellman Group Exchange (DHGEX)
A key agreement method that allows two parties to derive a shared secret key securely over an open (unprotected) network.

Diffie-Hellman key exchange
A public, key-exchange algorithm that is used for securely establishing a shared secret over an insecure channel.

Data that has been organized into a format that provides for quick access to each piece of data.

digest code
A number that is the result of a message digest function or a secure hash algorithm distilling a document.


  1. A symbol that represents one of the nonnegative integers smaller than the radix.
  2. Any of the numerals from 0 through 9.

Pertaining to data in the form of digits. See also analog.

digital asset management (DAM)
The protocol for working with media in an electronic format and the management of those assets.

digital audio
Audio tones represented by machine-readable binary numbers rather than by analog recording techniques.

digital certificate
An electronic document used to identify an individual, a system, a server, a company, or some other entity, and to associate a public key with the entity. A digital certificate is issued by a certification authority and is digitally signed by that authority. See also certificate authority certificate, user certificate.

Digital Certificate Manager (DCM)

  1. An i5/OS component that allows i5/OS to be a local Certificate Authority (CA) to create digital certificates that are used to ensure secure communications.
  2. An i5/OS option that registers certificates that are created on the system when it is acting as a certificate authority (CA). DCM can also be used to register certificates that other certificate authorities issue. DCM allows you to choose to associate a user's certificate with its user profile. DCM is also used to associate digital certificates with various applications so that these applications can use the Secure Sockets Layer (SSL) for secure communications.
  3. On i5/OS systems, the method of managing digital certificates and using them in secure applications on the iSeries server. Digital Certificate Manager requests and processes digital certificates from certification authorities (CAs) or other third-parties.

digital channel
A way to sell an IBM or IBM Business Partner product or service through digital discovery, engagement or purchase online, or with the assistance of a digital seller.

digital convergence
The transformation of content into digital content.

digital dashboard
A dashboard that provides analytics across the digital client journey and financial tracking of business results. The digital dashboard enables data-driven decision making to accelerate digital business.

digital data service adapter (DDSA)
In data communications, a device used when sending and receiving data using a nonswitched digital data service.

Digital Design System
A system that delivers a simplified and search-centric experience for ibm.com and enables automated services. It combines user interface (UI) design with an automated services architecture to deliver content and services to IBM category, solution, and product level pages.

digital disruption
The change that occurs when new digital technologies and business models affect the value proposition of existing goods and services.

digital engagement
The enterprise use of social media to involve consumers.

digital envelope
In the context of SET programs, a package of encrypted data and the encryption key.

Digital European Cordless Telecommunications (DECT)
A digital wireless telephone technology that is expected to make cordless phones much more common in both businesses and homes.

digital funnel
A business tool that provides insight into the performance of digital platform, marketing, and sales. The funnel defines the steps and key performance indicators (KPIs) to advance a client’s progression along the client journey.

digital half-toning
A method used to simulate gray levels on a bilevel device.

digital image
An image whose image data was sampled at regular intervals to produce a digital representation of the image. The digital representation is usually restricted to a specified set of values.

digital impression
A report consisting of tagged identifiers that are related to each other within an individual case.

digital impression relationship
A relationship between tagged identifiers related to a case.

Digital Intel Xerox protocol
A network protocol for Ethernet communications that was developed by Digital Equipment Corporation, Intel Corporation, and Xerox.

Digital Network Architecture (DNA)
The model for all DECnet hardware and software implementations.

digital offering
Any IBM or IBM Business Partner product or service that can be digitally delivered, used or consumed online or on the web. A digital offeringis often in the form of a free trial or freemium version.

Digital Offering Rep (DOR)
A brand-aligned representative who focuses on selling SaaS delivered products to all non-industry accounts. They are responsible for identification, progression, and closure.

digital platform
The set of capabilities that enables IBM to deliver a digital experience.

Digital Recommendations personalization cookie
A cookie that is used to maintain ordered lists of the most recently viewed, carted, and purchased items and the most recently viewed categories.

digital rights management (DRM)
A means of controlling access to copyrighted content.

Digital Sales Rep (DSR)
An inside sales rep whose primary focus is on driving digitally consumable offerings from response to close.

Digital Services Group (DSG)
An end-to-end services group that provides the full spectrum of strategy, production, content development, interactive, analytics, and engagement capabilities to IBM teams. The DSG provides digital services and runs like an external agency, complete with service level agreements (SLA) commitments, market-driven financial models, and real world competitive pressures.

digital signal processing (DSP)
A set of algorithms and procedures used to process electronic signals after their conversion to digital format. Due to the specific mathematical models required to perform this processing, specialized processors are generally used.

digital signature
Information that is encrypted with a private key and is appended to a message or object to assure the recipient of the authenticity and integrity of the message or object. The digital signature proves that the message or object was signed by the entity that owns, or has access to, the private key or shared-secret symmetric key.

digital signature algorithm (DSA)
A security protocol that uses a pair of keys (one public and one private) and a one-way encryption algorithm to provide a robust way of authenticating users and systems. If a public key can successfully decrypt a digital signature, a user can be sure that the signature was encrypted using the private key.

digital speech synthesizer
A device used with screen readers to portray what is on screen through sound. See also screen reader.

digital subscriber line (DSL)
A technology that dramatically increases the digital capacity of ordinary telephone lines in the home or office.

Digital Subscriber signaling System Number 1 (DDS1)
A signaling protocol used between ISDN subscriber equipment and the network. Carried on the ISDN D-channel. ITU-T recommendations Q.920 to Q.940 describe this protocol.

Digital Trunk Quad Adapter (DTQA)
An adapter to complete the connection to four packs in a Multiple Digital Trunk Processor.

digital unit
The team in charge of the digital strategy for IBM.

digital versatile disc (DVD)
An optical disc that has the same overall dimensions of a CD-ROM, but has significantly higher capacities than a CD-ROM. DVDs are also double sided, whereas CD-ROMs are single sided.

digital video
Video in which the information (usually including audio) is encoded as a sequence of binary digits.

digital video disc
See digital versatile disc.

Digital Video Interactive (DVI)
An integrated video, audio, and graphics technology allowing all forms of data (full motion video, still images, graphics, and text) to be displayed from any digital source. DVI allows real-time compression and decompression as well as display of digital graphics and full-motion video with audio.

digit grouping separator
The local symbol used to separate increments of digits such as the thousand or the hundred thousand increments.

To convert analog video and audio signals into digital format.

digitized image
An image derived from a scanning device or a digitizing card with a camera.

digit position
In COBOL, the amount of physical storage required to store a single digit. This amount can vary depending on the usage specified in the data description entry that defines the data item. If the data description entry specifies that the USAGE IS DISPLAY, then a digit position is synonymous with a character position.

A combination of two keystrokes used to represent unavailable characters in a C or C++ source program. Digraphs are read as tokens during the preprocessor phase.

See Domino Internet Inter-ORB Protocol.

Dijkstra's algorithm
See Shortest Path First.


  1. A data category that is used to organize and select monitoring context instances for reporting and analysis. Examples of dimensions are time, accounts, products, and markets. See also member.
  2. To compute the length, angle, or radius of elements on a drawing.
  3. A broad grouping of descriptive data about a major aspect of a business, such as products, dates, or locations. Each dimension includes different levels of members in one or more hierarchies and an optional set of calculated members or special categories.
  4. In System Manager, the interfaces that define guidelines, standards, services, and other interfaces for integrating systems management applications.
  5. In FD:OCA, each successive level of partitioning. Dimensions allow the addressing of specific parts of an array.
  6. A measure of spatial extent such as height, width or breadth, or depth. See also dimension line.
  7. A name and a value that together define a feature of a variant of a product.
  8. In multidimensional data, a structural attribute of a cube that organizes data to enable in-depth business analysis.
  9. The attribute of size given to arrays and tables.
  10. In Cognos Planning, a list of related items such as Profit and Loss items, months, products, customers, and cost centers, including calculations. The rows, columns, and pages of a cube are created from dimensions.
  11. A finishing item that consists of multiple lines and a piece of text. The lines indicate the distance or angle that is being dimensioned, and the text contains the computed entry of the lengths, angles, or radiuses of elements on a drawing.

dimensional data source
A data source containing data modeled using OLAP multidimensional concepts, including dimensions, hierarchies, and measures.

dimensional framework
The collection of reference dimensions in a catalog. The dimensional framework is used to provide information when merging data and delivering dimension data to a data mart.

dimensional model
The part of the monitor model that defines the cubes and cube content that are used for storing, retrieving, and analyzing the data that is gathered over time.

dimensional modeled relational data (DMR)
Metadata that has been modeled to present relational data (tables, columns, joins) as dimensions (members, measures).

dimension analytics
Data analysis based on dimensions and measures of spend.

dimension attribute
See level attribute.

dimension block index
In multidimensional clustering, a block index that is automatically created for a particular dimension when the dimension is defined on an MDC table. This index is used to maintain the clustering of data along that dimension, together with the other dimensions defined on the table. See also composite block index.

dimension break
The process of tracking changes in the dimension sequence to improve engine performance and reduce memory usage.

dimension build
A build that delivers data to describe a single business dimension, such as a product or a customer. A dimension build has a source dimension table, a hierarchy for the data, a target database, and a target table. See also build.

dimension build rule
A build rule that modifies an outline based on data in the external data source file.

dimension chart
A chart that displays incident points.

dimension data
Data that is used to describe or qualify facts in a star schema fact table.

dimension delivery
An object in a fact build that delivers data to describe a single business dimension, such as Product or Customer.

dimension delivery module
A delivery module used to deliver data, describing a single dimension, to a target data mart. See also delivery module.

dimension element
An element in the transformation model that is used to give context to a measure element. For example, a Product_Number dimension element, gives context to a Quantity measure element.

dimension hierarchy
A data construct that is used to group data into bins based on their value ranges. A dimension hierarchy can contain multiple levels, each of which has its own set of bins.

dimension instance count
The number of occurrences or instances that exist for a given dimension.

dimension item
One value in a dimension.

dimension level
An element or subelement of a dimension that is arranged hierarchically. For example, the time dimension can have years, months, and days as its levels.

dimension line

  1. A row of dimension names that appears either along the top of the dimension map window or just below the Measures and Data Sources option buttons in the Show Scope window. See also dimension.
  2. A solid line with arrows at both ends and a dimension in the center that is used to define the measurement of a part feature.

dimension map
A table that shows the Transformer model in rows and columns. The columns in a dimension map are, for example, the dimensions representing Dates, Products, and Sales Regions. The rows in a dimension map are the levels within the dimensions, for example, year, month, and day (for a time dimension) or continent, region, state, and city (for a geographical dimension).

dimension mapping category
A set of similar dimension maps. For example, a category can be created for days, weeks, and hours, with different levels of granularity.

dimension mapping table
A table that creates correlations between dimension tables from different data sources. Each data source may use different names for semantically similar elements.

dimension table

  1. The representation of a dimension in a star schema. Each row in a dimension table represents all of the attributes for a particular member of the dimension. See also star join, star schema.
  2. A database table that augments the data in a base record table. For example, a dimension table might contain demographic information, product information, or purchase transaction details.
  3. A table that contains attributes used to constrain and group data when performing data warehousing queries.

dimension view
A subset of a dimension used to create cubes that contain only selected aspects of the data represented by the complete model. For example, views based on specific countries or regions are a useful way of ensuring that users see only the data that is most relevant to them.

diminutive search
A search category that searches for aliases, nicknames, and diminutives of names.

See dual inline memory module.

See Deutsches Institut für Normung.

See data interchange program.

A transitional phase from one sound to the next, used as a building block for speech synthesis. There are typically between one thousand and two thousand diphones in any national language.

direct access
A file access method allowing reading and writing of records in an arbitrary order.

direct access method
An access method used to retrieve or update particular blocks of a data set on a direct access device.

direct access storage
A type of storage where information is stored or retrieved directly, without prior sequential searching. See also random access memory.

direct access storage device (DASD)
A device that allows storage to be directly accessed, such as a disk drive. See also random access memory.

direct access unmovable (DAU)
A data set that contains location-dependent data and, therefore, cannot be moved. A DAU is usually accessed with the basic direct access method (BDAM).

direct ACE
An editable access control entry (ACE) whose source type is direct.

direct activation
In VTAM, the activation of a resource as a result of an activation command that specifically names the resource. See also automatic activation, indirect activation.

direct argument passing
A method of passing arguments in which the value of the argument is included directly in the parameter list See also indirect argument passing.

direct attach
The environment in which an application program directly allocates a printer.

direct-attached storage (DAS)
A digital storage system that is directly attached to a server, without a storage network in between.

direct binding
A type of binding between network license servers and clients in which client applications locate license servers by means of a local text file that contains network addresses of the license servers.

direct binding server list
A set of network license servers and a central registry license server that collectively serve a set of network license clients.

direct call facility
A facility that permits calling without requiring the user to provide address selection signals; the network interprets the call request signal as an instruction to establish a connection to one or more predetermined data stations.

direct color
In Enhanced X-Windows, a class of color map in which a pixel value is decomposed into three separate subfields for indexing. One subfield indexes an array to produce red intensity values, the second indexes another array for blue intensity values, and the third for green intensity values. The RGB values can be changed dynamically. This is mutually exclusive to the Pseudocolor color map color.

direct connection
The attachment of a system, workstation, or other I/O device through a selected communication interface and a limited-length cable. No modem is required.

direct constructor
An XQuery constructor that contains XML-like notation to construct element, attribute, document, text, processing-instruction, or comment nodes. See also computed constructor, constructor.

direct data set
A data set that has records in random order on a direct access volume. Each record is stored or retrieved according to its actual address or its address relative to the beginning of the data set. See also sequential data set.

direct deactivation
In VTAM, the deactivation of a resource as a result of a deactivation command that specifically names the resource. See also automatic deactivation.

direct dependent segment
In a data entry database (DEDB), a segment that is chained from a root segment. A direct dependent segment is stored in either the root addressable portion or the overflow portion of a DEDB area.

direct dial
The process of using a modem and a regular telephone line to connect two computers or to connect a computer and a network.

direct dial in (DDI)
See direct inward dialing.

direct discount
An LTL rating process in which the shipper receives a specified discount when the carrier delivers the freight directly from the origin to the destination. A direct route is typically shorter and costs more than an indirect route, in which the truck makes an interim stop at a carrier depot or service center. See also indirect discount.

directed acyclic graph (DAG)
A graph with no path that starts and ends at the same vertex.

directed command
A RACF command that is issued from a user ID on an RRSF node. It runs in the RACF subsystem address space on the same or a different RRSF node under the authority of the same or a different user ID. See also automatic command direction, command direction.

directed connection
A connection between entities in which links that are in the same direction are represented as a single link on a chart. See also connection.

directed join
A relational operation in which all of the rows in one or both of the joined tables are rehashed and directed to new database partitions based on the join predicate. If all of the partitioning key columns in one table participate in the equijoin predicates, the other table is rehashed; otherwise (if there is at least one equijoin predicate), both tables are rehashed.

directed Locate search
See directed search.

directed maintenance procedure
See fix procedure.

directed recall
The moving of a migrated data set from a level 1 or a level 2 volume to a level 0 volume. Directed recall specifies the target volume and unit name.

directed routing
In an IMS multisystem environment, the routing of response messages to other than the originating terminal as directed by a link receive routing exit routine.

directed search
A search request that is sent to a specific destination node. A directed search is used to verify the continued existence of the resource, and to obtain the routing information specific to the node.

direct file
A file that contains records that have a relationship between the contents of the record and the record position at which the record is stored.

direct inward dialing (DID)
A service of a local phone company (or local exchange carrier) that provides a block of telephone numbers for calling into a company's private branch exchange (PBX) system.


  1. An indicator of whether a specified calibration point is increasing or decreasing with respect to the reference point.
  2. The print direction of data on a logical page, line, or field. The ultimate reference point for all direction controls on a page is the hardware origin. Secondary and tertiary reference points are possible as well, allowing more than one print direction on a page.

directional component
In AIXwindows, a portion of a compound string that specifies a direction with a given value. The directional component is created with the XmStringDirectionCreate function.

direct issue item
An ordered item that is issued immediately upon receipt to a work order, equipment, or location rather than stocked in the storeroom.


  1. A statement that is used in an application configuration file to define a particular setting for the application.
  2. An instruction in a source program that guides the compiler in making the translation to machine language but is not itself translated into instructions in the object program.
  3. A control statement that directs the operation of a feature and is recognized by a preprocessor or other tool. See also pragma.
  4. A first-failure data capture (FFDC) construct that provides information and suggested actions to assist a diagnostic module in customizing the logged data.

direct line
See nonswitched line.

direct load
A session for which there is no referral information and no marketing program. Direct loads are started by a user typing in the URL directly, bookmarking the website, or by means of a local referral (a page internal to the website).

directly allocated printer
A printer that is allocated to the application program.

directly applied ACE
An access right acquired from a document class with subsequent edits made by a user or application. Directly applied access rights have precedence over those indirectly applied.

directly applied property
A property that is assigned to a subclass, but not to its superclass.

direct managed resource
A managed resource that is not enclosed in a hosting domain. A direct managed resource must be registered independently when it is installed. The root managed resource of a hosting domain is a direct managed resource. See also hosting domain, indirect managed resource.

direct manipulation
The use of a pointing device to work with objects, rather than through menus. For example, changing the size of a window by dragging one of its edges is direct manipulation.

direct memory access (DMA)
The transfer of data between memory and an input/output device without processor intervention.

direct memory buffer (DMB)
Local memory that is used to receive inbound data over an SMC-D link. The remote peer places TCP socket application data directly into the DMB that the local peer assigns to receive data for the TCP connection. The local peer then copies the data from the DMB into the receive buffer of the receiving socket application.

direct monitor handler
An exception handler that allows the application programmer to directly declare an exception monitor around limited high-level language source statements. For ILE C, this capability is enabled through the #pragma statement.

Director Agent
See IBM Director Agent.

Director Console
See IBM Director Console.

Director Core Services
See IBM Director Core Services.

Director database
See IBM Director database.

Director environment
See IBM Director environment.

Director extension
See IBM Director extension.

Director Server
See IBM Director Server.

Director Server service
See IBM Director Server service.

Director service account
See IBM Director service account.


  1. A file that contains the names and controlling information for objects or other directories.
  2. A collection of open systems that cooperate to hold a logical database of information about a set of objects in the real world.
  3. The DB2 for z/OS system database that contains internal objects such as database descriptors and skeleton cursor tables.
  4. In OSI, a repository of information about objects. As defined in the X.500 directory standards, a directory is both a repository of information and the set of services provided to enable its users to access the information in the repository.
  5. A table of identifiers and references to the corresponding items of data.
  6. In a hierarchical file system, a grouping of related files.
  7. A file containing a set of tables that store all product-specific object definitions created by the user for a site.
  8. In VM, a Control Program (CP) disk file that defines each virtual machine's typical configuration, including the user ID, password, dispatching priority, and other information.
  9. The part of a partitioned data set that describes the members in the data set.

directory access protocol (DAP)
In OSI, the X.500 protocol that a directory user agent uses to obtain directory information from a remote directory system agent.

directory assistance
A feature used by servers to extend client authentication, name lookups, and LDAP operations to secondary directories.

directory assistance database

  1. A Notes database created from the DA50.NTF template and used to configure Directory assistance.
  2. A Domino database that servers use to locate directories that are not the primary Domino directory.

directory catalog
An optional directory database that can aggregate entries from multiple Domino Directories into a single database.

directory-container storage pool
A storage pool that a server uses to store data in containers in storage pool directories. Data that is stored in a directory-container storage pool can use either inline or client-side data deduplication. See also cloud-container storage pool, container storage pool, container-copy storage pool, storage pool.

directory default ACL
A model access control list (ACL) that is inherited by subdirectories that are created within the parent directory.

directory entry

  1. An entry in the system distribution directory. A directory entry contains information about the user, such as user ID and address, system name, profile name, mailing address, and telephone number.
  2. A logical record in a program library directory that contains a member or alias name, a pointer to that member, and attributes of that member.

directory entry name
A means of identifying the directory entry of a named object to the coupling facility. The directory, all of its entries, and all of the objects associated with those entries are contained in a single structure.

directory entry service (DE service)
A function that manages directory entries in partitioned data sets (PDSs) and partitioned data sets extended (PDSEs). DE services can be used by unauthorized as well as authorized programs.

directory indexing
A web server feature that exposes contents of a directory when no index page is present.

directory information base (DIB)
In OSI, an X.500 term indicating a collection of all directory information in a directory system made up of one or more cooperating directory system agents.

directory manager
A facility for maintaining the user directory of one or more z/VM systems.

directory manager domain
A CICS domain that provides resource-table lookup services for CICS Transaction Server for z/OS components such as transaction manager, program manager, and user domains. The resource definitions for which the directory manager domain provides services are transaction definitions, remote transaction definitions, transaction classes, TPNames, user attributes, programs, BMS mapsets, and BMS partition sets.

directory model ACL
See directory default ACL.

directory pointer
In the hierarchical file system, the representation of the position of the next directory entry to be read.

directory schema
The valid attribute types and object classes that can appear in a directory. The attribute types and object classes define the syntax of the attribute values, which attributes must be present, and which attributes may be present for the directory.

Directory Server
See IBM Tivoli Directory Server for i5/OS.

directory server
A server that can add, delete, change, or search directory information on behalf of a client.

directory service (DS)

  1. A component that provides naming, object storage, and lookup capabilities to other components.
  2. In APPN, a component that is responsible for maintaining a directory of SNA logical units, along with information about those LUs’ locations and availability.
  3. A directory of names, profile information, and machine addresses of every user and resource on the network. It manages user accounts and network permissions. When a user name is sent, it returns the attributes of that individual, which might include a telephone number, as well as an email address. Directory services use highly specialized databases that are typically hierarchical in design and provide fast lookups.
  4. A facility such as Lightweight Directory Access Protocol (LDAP) or Microsoft Active Directory that provides information about users and groups in an organization.
  5. In OSI, the service by which an open system can access directory information. Directory service can be provided locally within an open system, or it can be obtained from another open system using the directory service protocols defined by ISO/CCITT. In OSI Communications Subsystem, directory service is used to obtain the presentation address and other attributes of application entities.

directory shadowing
The capability of a system to duplicate Enterprise Address Book (EAB) data from one installation of the EAB to another, such that whenever an addition, change, or deletion is made to the EAB on a given system, it is available to all EAB installations within the network.

directory synchronization
The replication of Domino directories between on-premises Domino servers and SmartCloud Notes cloud servers. This process also applies to synchronizing LDAP with the Connections Profiles database.

directory synchronization server
An on-premises Domino server that acts as a hub server for directory synchronization.

directory system agent (DSA)
In Open Source Initiative (OSI), an application process residing in an open system that provides directory service to other open systems.

directory traversal
A technique used to exploit websites by accessing files and commands beyond the document root directory.

directory tree
Hierarchical structure of directories, subdirectories and files on a storage medium.

directory user agent (DUA)
In OSI, an application process residing in an open system that serves as the agent that obtains directory services for that open system. The agent can obtain the services either locally or from a remote directory system agent.

direct outward calling (DOD)
A service of a local phone company (or local exchange carrier) that allows subscribers within a company's private branch exchange (PBX) system to connect to outside lines directly.

Direct Printer Services Subsystem (DPSS)
The PSF subcomponent that acts as the interface between PSF and an application program when the job entry subsystem is not spooling jobs for a printer. DPSS attaches PSF as a subtask for use in the direct-printing mode.

direct printing
Printing in which the print file or print data set is printed immediately.

direct printing mode
A printing mode that gives PSF exclusive use of a channel-attached printer. Output is printed immediately and is not spooled through JES. See also deferred printing mode.

direct procurement
The acquisition of raw materials and other products or services that are incorporated into products sold to a company’s customers.

direct rate contract
A contract that stores representative shipment rates, which are used by the Sterling TMS optimizer.

direct routing

  1. In Internet communications, the transmission of an Internet Protocol (IP) datagram when the destination and the source reside on the same IP network or IP subnet.
  2. An option for routing publications in a publish/subscribe cluster. With direct routing, every queue manager in the cluster sends publications from any publishing queue manager direct to any other queue manager in the cluster with a matching subscription.

direct sales business model
A business model that supports commerce transactions involving products, services, or information directly between businesses and consumers or between two businesses or parties. See also B2B direct business model, consumer direct.

direct sales store
A customer-facing store that supports the exchange of products, services, or information directly between businesses and consumers, or between two businesses or parties. See also extended site store.

direct search list (DSRLST)
A message unit that contains a search request that is sent throughout subarea networks to obtain information about a network resource (such as its name, routing information, and status information).

direct service
In MERVA, a service that uses resources that are always available and that can be used by several requesters at the same time.

direct speech recognition
Identification of words from spoken input read directly from the telephony channel. See also indirect speech recognition.

direct spend
An amount of money used to acquire products and services that contribute directly to the manufacture of a product. In a manufacturing environment, direct spend includes purchasing raw materials or subcontracting a manufacturing service.

direct store delivery (DSD)
The shipment of a product from the manufacturer to the retailer bypassing distributors and wholesalers.

A voice processing system, bringing together telephone and data communications networks to use information stored in databases directly from a telephone.

DirectTalk bean
One of the DirectTalk Beans that provides access from a voice application to simple call control functions: waiting for a call, making an outgoing call, handing a call over to another application, and returning a call when finished.

See Message Center.

direct tender
A tendering event in which the shipper overrides the Route Guide and selects a specific carrier to take the shipment. Shippers can perform a direct tender by submitting a shipment through data exchange with the carrier already assigned. See also manual tender.

See DADSM interrupt recording facility.

Pertaining to a screen of multiple widgets that contain unsaved data. See also dirty check.

dirty address space
An address space requiring daemon authority that has had an uncontrolled program loaded into it. A dirty address space cannot perform daemon activities. See also controlled program.

dirty check
The process of determining whether there is unsaved data on a screen. See also dirty.

dirty read

  1. An SQL transaction that reads data that is written by concurrent uncommitted transactions.
  2. A read request that does not involve any locking mechanism. This means that data can be read that might later be rolled back resulting in an inconsistency between what was read and what is in the database. See also read integrity, read uncommitted.

To disconnect or stop a subsystem.


  1. Pertaining to a state of a processing unit that prevents the occurrence of certain types of interruptions. See also enabled.
  2. In VTAM, pertaining to a logical unit (LU) that has indicated to its system services control point (SSCP) that it is temporarily not ready to establish LU-LU sessions. An initiate request for a session with a disabled logical unit (LU) can specify that the session be queued by the SSCP until the LU becomes enabled. The LU can separately indicate whether this applies to its ability to act as a primary logical unit (PLU) or a secondary logical unit (SLU). See also enabled, inhibited.
  3. Pertaining to the state in which a transmission control unit or audio response unit cannot accept incoming calls on a line.
  4. Pertaining to an object that is not accepting new data. Disabling an object does not affect the definition or existence of that object, rather, disabling an object keeps new data from flowing into the object and to all objects that rely on the target object.

disabled mechanism
A function of a printer that is temporarily out of operation or is not supported. In such a case, PSF might allow jobs to print with alternative options.

disabled mode
The object mode in which a database object is disabled. When a constraint, index, or trigger is in the disabled mode, the database server acts as if the object does not exist and does not take it into consideration during the execution of data manipulation statements.

disabled user
A user that is not enabled to utilize IBM StoredIQ. Disabled users can be activiated within IBM StoredIQ Administrator.r.

disallow rule
A rule that prevents a transaction from proceeding when the rule's conditions are met. Approval by a member of an approval group cannot override violations of a disallow rule, and no additional rules are evaluated.

The process of selecting the correct meaning where the same word or sentence can have different meanings, each of them valid.

disaster backup
A means to protect a computing system against data loss in the event of a disaster. Disaster backup is the portion of disaster recovery in which a secure copy of data is made.

disaster recovery

  1. A procedure for copying and storing an installation's essential data in a secure location, and for recovering that data in the event of a catastrophic problem. See also vital records.
  2. The process of restoring a database after a partial or complete site failure that was caused by a catastrophic event such as an earthquake or fire. Typically, disaster recovery requires a full database backup at another location.
  3. The process of restoring a database, system, policies after a partial or complete site failure that was caused by a catastrophic event such as an earthquake or fire. Typically, disaster recovery requires a full backup at another location.

disaster recovery as a service (DRaaS)
A service that replicates and hosts physical or virtual servers to provide failover in the event of a man-made or natural catastrophe.

disaster recovery manager (DRM)
A function that assists in preparing and using a disaster recovery plan file for the server.

disaster recovery plan

  1. A file that is created by the disaster recover manager (DRM) that contains information about how to recover computer systems if a disaster occurs and scripts that can be run to perform some recovery tasks. The file includes information about the software and hardware that is used by the server, and the location of recovery media.
  2. A set of detailed procedures that are required to activate the disaster recovery center in the event of a disaster which impacts the production environment site. The disaster recovery plan is reviewed and tested annually.

disaster recovery site
A secondary location for the production environment in case of a disaster.

See disconnect.

To remove a change set from a repository workspace.


  1. In System Manager, a grouping of systems management tasks that support an enterprise's information system environment. Examples of disciplines are change management and problem management.
  2. An ordering method used to line up jobs for printing.

Disciplined Agile Delivery (DAD)
A hybrid approach to software design that extends scrum project management techniques with proven strategies from agile modeling, extreme programming (XP), and the Unified Process (UP), as well as the Kanban, lean, and outside-in software development methods, among others. It is not proprietary, so it is freely available for all to use.

A user-defined relationship between two identities in two separate entities.

disclosure review board
See invention development team.

disconnect (DISC)

  1. In communications, the transmission control character that is part of the sequence for disconnecting a switched line.
  2. To break the connection between an application and a queue manager.

disconnect character
In data communications, the part of the BSC transmission control sequence for ending the connection on a switched line.

disconnected device
A device that is online, but Linux can no longer find a connection to.

disconnected mode (DM)
In communications, a response from a secondary station indicating that it is logically disconnected from the link.

disconnect timeout
An indication that a switched BSC connection was disconnected because there was no activity on the connection for a specified length of time.

discontiguous shared segment (DCSS)
An area of virtual storage outside the address range of a virtual machine. It can contain read-only data or reentrant code. It connects discontiguous segments to a virtual machine's address space so programs can be fetched.

discount limit
A limit that is configured for a manual pricing rule for quotes, that if exceeded, requires approval before it can be presented to a customer.


  1. To identify resources within a network environment.
  2. In UDDI, to browse the business registry to locate existing web services for integration.

Discoverable Taxonomy Set (DTS)
A collection of taxonomy schemas and linkbases. The DTS includes all taxonomy schemas and linkbases that can be discovered by following links or references in the taxonomy schemas and linkbases included in the DTS.

discovered server
A server that runs the middleware agent and is found outside of the administrative environment but has a server representation automatically created within the administrative environment. The representation that is created is an assisted life-cycle server.

A function of a crawler that determines which data sources are available for the crawler to retrieve information from.


  1. The automatic detection of a network topology change, for example, new and deleted nodes or links.
  2. In law, the pretrial phase in a lawsuit in which each party can request documents and other evidence from other parties or compel the production of documents and other evidence using the legal system.
  3. The process of finding resources within an enterprise, including finding the new location of monitored resources that were moved. See also data collection, schedule.
  4. The process during which each party in a lawsuit requests relevant information and documents from the other side. Any information that is relevant to the case must be preserved to ensure compliance with legal responsibilities.
  5. The process of identifying the configuration items present in an IT environment.

discovery association
The relationship created with the method or application used to discover a device. An existing device in the data center model must have a discovery association in order to perform discovery.

discovery delegate
An employee who is responsible for preserving or collecting legally pertinent information that resides on a specific data source. A single data source can have more than one discovery delegate or none unless the system is configured such that a discovery delegate is a required part of a data source's definition.

discovery export
An export that contains data that is produced from a discovery export action. That data is kept so that it can be exported as a load file and uploaded into a legal review tool.

discovery export action
An action that identifies duplicate files based on content-based digest and exports only one copy of a file per data server. The discovery export action copies data objects and generates an EDRM XML file for loading into third-party legal review tools.

discovery export volume
A storage entity that contains data that is produced from a discovery export action or from a policy. The data is kept so that it can be exported as a load file and uploaded into a legal review tool.

discovery library adapter (DLA)

  1. A program that copies data from a management software system, converts it to IDML, and stores it in books in the discovery library.
  2. A component of an IBM product that captures discovery information.

discovery library book
An XML document that stores discovery information and their relationships. The discovery library book can be later consumed by other discovery library aware systems.

discovery map
A draft of process milestones and the activities in those milestones for brainstorming or interviewing sessions with process experts.

discovery policy

  1. The actions that an administrator or Tivoli Intelligent Orchestrator is to take if a certain new item or if a difference in the data model is discovered.
  2. A policy that defines an area of the web environment to investigate and sample the transaction activity of real customers and average performance times for Uniform Resource Indicator (URI) requests during a specified time period to set a baseline of performance.

discovery request
A solicitation for information that is intended to lead to the discovery of potentially relevant data, such as admissible evidence at the trial of a matter.

discovery server
A server that is used to collect, store, and work with configuration item information using the configuration management database.

discovery technology
An application that is used to perform configuration change detection in Tivoli Intelligent Orchestrator.

discovery tool
A program that scans computers and other devices connected to a network and records information about their installed hardware and software.

discrepancy record
A record that tracks inconsistencies that affect the overall status of an aircraft.

Pertaining to an element that is cleanly separated from another element; they are not connected. For example, integers are discrete: between any two consecutive integers, there is some distance.

discrete backup profile
A Resource Access Control Facility (RACF) profile created when DFSMShsm backs up a cataloged, RACF-indicated data set.

discrete code
In architecture, a bar code symbology characterized by placing spaces that are not a part of the code between characters, that is, intercharacter gaps. See also continuous code.

discrete device
An instrument that has only two settings, such as, a switch that is either on or off or a valve that is either open or closed.

discrete profile
A Resource Access Control Facility (RACF) profile that contains security information about a single data set, user, or resource. See also data set profile, fully qualified generic profile, generic profile, profile, resource profile.

discrete variable
A variable that can only assume values that are a member of a discrete set, such as the integers.

discrete word recognition
Identification of spoken words separated by periods of silence, or input one at a time. See also continuous speech recognition.

discretionary access control
A security mechanism that protects information from unauthorized disclosure or modification through owner-controlled access to files. See also mandatory access control.

discretionary goal
A service class performance goal assigned to low priority work that does not have any specific performance goal. Work is run when system resources are available.

discretionary hyphen
See soft hyphen.

discretionary task
A task that is reserved for activities that are routinely performed for a case but might not be performed regularly.

In Ada language, a distinguished component of an object or value of a record type. The subtypes of other components, or even their presence or absence, may depend on the value of the discriminant.

discriminated union
In XDR, a C language union that holds several data types, with one arm of the union being an enumeration value, or discriminant, which holds a specific object to be processed over the system first.

An object that enables a system to select operations and event reports related to other managed objects. See also event forwarding discriminator.

A mechanism for reviewers to exchange views about the content of a module or an object, within the module or object itself.

The curve a stack of forms takes when folded or refolded at the fold perforation.


  1. Pertaining to a security label relationship where two security labels must not be equivalent and neither one can dominate the other. See also dominant, equivalent.
  2. See node disjoint.

disjoint network
In a network, two or more subnetworks with the same network identifier that are indirectly connected. For example, through an SNA network interconnection.


  1. A storage device that includes one or more flat, circular plates with magnetic or optical surfaces on which information is stored.
  2. See drive.

disk 16 pack
A group of 16 disk drive modules (DDMs) installed as a unit in a DDM bay. A disk 16 pack is sometimes referred to as a DDM bay.

disk adapter
The hardware used by a computer to access and control disk drives. On POWERstations and POWERservers, disk adapters each fit into a single Micro Channel slot, and each are controlled by software device drivers.

disk array controller
The device, such as a Redundant Array of Independent Disks (RAID), that manages one or more disk arrays and provides functions. See also disk array router.

disk array router
A router that represents an entire array, including current and deferred paths to all logical unit numbers (LUNs). See also disk array controller.

disk cage
A container for disk drives.

disk configuration
The organization of data on a disk.

disk descriptor
A definition of the type of data that the disk contains and the failure group to which this disk belongs. See also failure group.

disk drive

  1. See drive.
  2. The mechanism used to read and write information on a disk.

disk drive bay
See drive.

disk drive module (DDM)

  1. A field-replaceable unit (FRU) that consists of a single disk drive and its associated packaging.
  2. See drive.

disk drive module group
See disk 16 pack.

disk eight pack
A group of eight disk drive modules (DDMs) installed as a unit in a chassis. A disk eight pack is sometimes referred to as a DDM bay.

disk enclosure

  1. The part of a disk unit that contains the read and write heads, the magnetic disks, and the actuators.
  2. A sealed container that holds the read/write head and disk assembly within a disk unit.

A thin, flexible magnetic plate that is permanently sealed in a protective cover. It can be used to store information copies from the disk or another diskette.

diskette drive
The device used to read or write data on a diskette as the diskette rotates within its protective jacket.

diskette file
A device file created by the user for a diskette unit.

diskette storage device
A direct access storage device that uses diskettes as the storage medium.

diskette unit
A physical enclosure containing one or more diskette drives.

disk event
The failure of a disk or disk adapter. Disk events are handled by the AIX operating system through LVM mirroring on SCSI disk devices and by internal data redundancy on RAID device disk arrays.

diskful node
See stateful node.

disk group
A collection of disk drives in the same loop configured by the ESS to be available for assignment as a Redundant Array of Independent Disks (RAID). A disk group can be formatted as count key data (CKD) or fixed block, formatted as RAID, or left unformatted. A disk group is a logical assemblage of multiple disk drives, in contrast to a disk eight pack or disk 16 pack.

disk I/O
Fixed-disk input and output. See also buffered disk I/O.

disk leasing
A method for controlling access to storage devices from multiple host systems. Any host that wants to access a storage device configured to use disk leasing registers for a lease; in the event of a perceived failure, a host system can deny access, preventing I/O operations with the storage device until the preempted system has reregistered.

The property of a workstation that has no local file systems or local boot images to access some of its resources remotely. Diskless clients boot remotely from a diskless server and use the server for remote paging.

diskless node

  1. See stateless node.
  2. A Linux node with no disk or a Linux node that does not use its disk to store the operating system or packages.

Disk on Module (DOM)
A USB flash drive that can be used in place of a hard disk drive. Disk on Modules (DOMs) are used particularly in embedded systems where they can be deployed in an environment that mechanical hard disk drives fail to operate. DOMs can also be deployed in thin clients because of their relatively small size, low power consumption (and low heat output), and silent operation.

disk operating system (DOS)
An operating system for computer systems that use disks and diskettes for auxiliary storage of programs and data.

disk pool

  1. In z/VM Center, a logical grouping of contiguous disk spaces. A disk pool can include disk spaces from multiple physical disks. A disk pool corresponds to a z/VM Directory Maintenance Facility allocation group.
  2. An auxiliary storage pool that contains only disk units.

disk pool group
Made up of a primary disk pool and zero or more secondary disk pools, each of which are independent in regard to data storage, but combine to act as one entity.

disk quota
A limit on the amount of disk space and the number of files a user can own.

disk server
A high-capacity disk storage device that each personal computer on a network can access and use as if it were its own hard disk.

disk storage pool
A collection of disks or RAID arrays used to create tiers of storage by grouping storage-based devices based on performance, locality, or reliability characteristics.

disk takeover
An event in which a surviving node assumes control of a shared disk so that the disk remains available when the node that currently owns the disk fails (for nonconcurrent access configurations). See also fast disk takeover.

disk unit
A sealed container that holds the read and write heads, the magnetic disks, and the actuators. See also random access memory.

disk unit enclosure
A physical enclosure containing one or more disk units.

disk-usage accounting
The record of the number of disk blocks occupied by a user's files. Disk-usage accounting is performed by the acctdisk command.

disk zone
A zone that is defined in the storage area network (SAN) fabric in which the systems can detect and address the logical units (LUs) that the storage systems present.

The relationship of ones and zeros in an encoded character. Neutral disparity indicates an equal number of ones and zeros, positive disparity indicates a majority of ones, and negative disparity indicates a majority of zeros.


  1. To assign an officer to respond to a particular alarm or incoming call.
  2. To allocate processing time on a specific device for a job that is ready to run.
  3. In CICS, to schedule a task for execution. Dispatching is done by CICS task control. See also service request block.

dispatch concurrency level
The number of threads that the WLM dispatcher can dispatch to the operating system at the same time.


  1. A stand-alone application that acts as an intermediary between one or more devices and large event providers. The dispatcher retrieves all location messages from the event providers it is connected to and distributes them to one or more devices.
  2. In XOM, the software that implements the service interface functions using workspace interface functions.

dispatcher domain
Major component of CICS concerned with attaching, running, and detaching tasks and scheduling task control blocks for the various modes: quasi reentrant, resource-owning, or concurrent.

dispatching priority
A number assigned to tasks, used to determine the order in which they are to use the processor in the CICS multitasking environment.

dispatch monitor
A monitor that displays dispatch information.

dispatch selection
A light blue shape that is displayed on the locations dimension map to highlight a dispatch area.

The range of numbers with distinct values in a column.


  1. A positive or negative number that can be added to the contents of a base register to calculate an effective address.
  2. The distance from the beginning of a record, block, or segment to the beginning of a particular field.


  1. To direct the output to the user's terminal. If the output is not directed to the terminal, the results are undefined.
  2. A visual presentation of data.
  3. A search application component that defines the appearance of the web pages for the search application.
  4. To present data visually.

display attribute

  1. In XGSL, any one of the following characteristics associated with displays: (a) blink supported or not supported, (b) color or monochrome, (c) changeable color palette or fixed color palette, and (d) APA (all points addressable) or character. An APA display can address each pixel, while a character display addresses character-sized blocks of pixels.
  2. In computer graphics, a property that is assigned to a display element, to a display segment, or to the complete display image; for example, a bright intensity or particular color.

display device
In Enhanced X-Windows, a set of one or more screens and input devices that are driven by a single X Server.

display field
An area on a display space that contains a set of characters that can be manipulated or operated upon as a unit. For example, prompts and messages.

display file
A device file to support a display station.

display format
A set of display preferences that a customer at a multicultural store can select, depending on their language and locale. For example, a multicultural commerce site may have different formats for United States English and Japanese. These display formats would differ in the language of the text as well as such features as currency, units of measure, and data formats.

display image

  1. In 3270 emulation, the x-character block (where x is the maximum number of characters that can fit on the display screen, or 1920 for printers) that contains data in the sequence in which it would appear on the display screen or the printer. When creating the display, the user can specify the display image with or without field definitions, such as position, length, and other attributes.
  2. A collection of display elements or segments that are represented together at any one time on a display surface.(I)(A)

display label
A temporary name for a column or an expression in a query.

display language
The language of the user interface that can be selected by users so that IBM Connections is displayed in their preferred language.

display layout sheet
In SDA, a form used to plan the location of data on the display.

display level
See display type.

display list
In GL, a sequence of drawing commands that have been compiled into a unit and perform like a macro; an object can be invoked multiple times simply by referring to its name. The object can be instantiated at different locations, sizes, and orientations by appropriate use of the transformation matrices.

display media
Various methods for attracting consumer attention to a particular product.

display mode
The mode (PROMPT or NOPROMPT) in which SWIFT messages are displayed.

display name
The name that an anonymous user (one who is not logged in and has not been authenticated) provides for display in the participants list of a chat or meeting.

display page

  1. A page in a catalog that displays category and product information.
  2. A page in an online store that is generated in response to a command.

display panel
In computer graphics, a predefined display image that defines the locations and characteristics of display fields on a display surface.

display point
In the GDDM function, the smallest addressable area on the screen, sometimes called a picture element (pel), that defines the resolution of the characters or images.

Display PostScript (DPS)
An on-screen display system that extends the capabilities of Postscript.

display screen
See screen.

display session
A PC program that allows a personal computer to emulate a display station.

display station
A device, usually equipped with a keyboard and a display device, capable of sending and receiving information over a communications line. See also workstation.

display station pass-through (DSPT)
A communications function that allows a user to sign on to one system (such as a System i, a System/38, or a System 36 system) from another system (such as a System i, a System/38, or a System 36 system) and use that system's programs and data.

display symbol
A predefined printable graphics symbol (such as, characters, numbers, math symbols, Greek letters, and so on) that can be displayed on a graphics display.

display terminal
A host screen used by the HATS developer to observe interactions between a HATS application and a host application.

display type
In Tivoli NetView for OS/390, one of the three elements, which also include data type and resource type, that are used to describe the organization of panels. Display types include total, most recent, user action, and detail.


  1. The process of decommissioning applications at the end of their business utility and after legal duties have elapsed.
  2. The process of removing or deleting data or from the system typically after a defined period.

disposal phase
A phase of a disposition schedule that controls the retention of entities in a particular state for a specified time period.


  1. The status of an alert.
  2. To assign a status to an alert.
  3. The session to which a data management event is delivered. An individual disposition is set for each type of event from each file system.
  4. In printing, the process of specifying whether a print job should be printed, retained, or printed and then retained.
  5. A status given to a candidate within an applicant tracking system (ATS) to signify their current level of completion within the hiring process.
  6. The action that is taken when a record reaches the end of its retention period. Common disposition types are destroy or delete, transfer to an archive, or review by the record owner.
  7. The state of a record after cutoff is applied through created disposition schedules and associated with containers.
  8. In file processing, the process of specifying whether a file is new, old, or shared, and how the file is to be shared.
  9. In WebSphere Commerce, disposing of or transferring inventory that has been returned to the Seller's fulfillment center by a customer. See also fulfillment center.

disposition action
An action that is performed on entities after the cutoff is reached or when their retention period in a disposal phase is over. For vital records, the disposition action is a periodic review.

disposition grace period
The time between when a disposition request is approved and when the documents are disposed from the matter. The default period is 14 days.

disposition hold
A temporary suspension of disposition processing. Each hold is for a specific use and can be applied to several entities at one time.

disposition processing
A function performed on data sets at the end of a job step to keep, delete, catalog, remove from a catalog, or pass them to a subsequent job step, depending on the data set status of the disposition specified in the data definition (DD) statement.

disposition request
A request to dispose of all documents from a matter.

disposition requester
A user who can request the disposition of all documents from a matter. The disposition requester initiates the disposition workflow by registering a disposition request.

disposition schedule
The set of instructions for disposing of a record. A disposition schedule specifies the retention rules for records and instructions for disposing them when the retention period ends. An authorized user defines a disposition schedule and associates the schedule with a record category, record folder, or record type. A volume inherits the disposition schedule of the record folder under which it is created.

disposition subscriber
A user who is alerted when a disposition request is initiated. The disposition subscriber can approve or cancel the request.

disposition sweep
A daemon process that finds records ready to move to the next phase of their disposition schedule.

disposition workflow
A workflow that is associated with a disposition action that automates that part of the disposition process.

dispute resolution
The process of resolving conflicts between two or more parties. Tealeaf facilitates dispute resolution by serving as a neutral transaction record. For example, if a customer thought they were buying a product at one price yet discovers a charge for another price, Tealeaf's session replay can be used to show the price displayed to the customer at the time of the transaction.

distance break
A distance in miles or kilometers at which transportation costs change.

distance factor
In logistics, a multiplier applied to the straight-line distance between two sites to provide an estimate of road distance.

distance learning
See e-learning.

distance-vector routing protocol
A type of routing protocol in which each router uses the number of hops in a route to find the shortest-path spanning tree and periodically sends its entire routing table to its neighbors. See also link state routing protocol.

A batch utility that converts PostScript files to Adobe PDF files. The distiller runs on AIX, HP-UX Itanium, Solaris, and Windows servers.

distinct data type
In SQL, a data type derived from another data type. A distinct type always has the same internal storage representation as its source type (such as an existing opaque data type, built-in data type, named row type, or distinct data type). It might have the same casts and routines as its source type, however it must have a unique name. See also data type.

distinct prompt
A prompt that requires a user to enter a value that matches a value defined in the database.

distinct type
A user-defined data type that shares a common representation with a built-in data type. See also built-in data type, strongly typed distinct type, user-defined data type, weakly typed distinct type.

distinguishable types
Types that do not have common data objects.

Distinguished Encoding Rules (DER)
A standard, based on the Basic Encoding Rules, that is designed to ensure a unique encoding of each ASN.1 value, defined in ITU-T X.690. See also Basic Encoding Rules.

distinguished name

  1. In Open System Interface (OSI), a multipart hierarchical name that can be used to identify OSI objects globally. The distinguished name of an object is formed from the sequence of its relative distinguished names (RDNs) and the name of its superior object.
  2. The name that uniquely identifies an entry in a directory. A distinguished name is made up of attribute:value pairs, separated by commas. For example, CN=person name and C=country or region. See also bind distinguished name.
  3. A set of name-value pairs (such as CN=person name and C=country or region) that uniquely identifies an entity in a digital certificate.

distinguished property
A property value that has been altered from its original, inherited value.

In data communications, an undesirable change in a wave form that can occur between two points in a transmission system. The six major forms of distortion are: (a) bias, (b) characteristic, (c) delay, (d) end, (e) fortuitous, and (f) harmonic.


  1. Pertains to non-mainframe hardware platforms, including personal computers and workstations. See also distributed software, distributed software.
  2. Pertaining to programs and computerized sources of information of a computing environment that are physically located on different computer systems, while still working together as a single logical unit.

distributed agent
The software running on a computer that is part of a Tivoli Workload Scheduler domain, on which you can schedule jobs from Tivoli Workload Scheduler for z/OS. Examples of distributed agents are the following: standard agents, extended agents, fault-tolerant agents, and domain managers. See also fault-tolerant workstation.

distributed application

  1. In message queuing, a set of application programs that can each be connected to a different queue manager, but that collectively comprise a single application.
  2. An application made up of distinct components that are located on different computer systems, connected by a network. See also client/server.
  3. A streams processing application that runs on the runtime system. See also stand-alone application.

Distributed Command Execution Manager (DCEM)
A graphical user interface (GUI) that can run commands on multiple cluster nodes simultaneously.

Distributed Component Object Model traffic (DCOM traffic)
Network activity that surrounds the Microsoft Distributed Component Object model.

distributed computing
A method of computing in which large problems are divided into small tasks that are distributed across a network for simultaneous processing. Individual results are then brought together to form the total solution.

Distributed Computing Environment (DCE)
In network computing, a set of services and tools that supports the creation, use, and maintenance of distributed applications across heterogeneous operating systems and networks.

distributed data
Data that is stored on more than one system and is available to remote users and application programs.

distributed database
A database that appears to users as a logical whole, locally accessible database, but consists of databases in multiple locations that are connected by a data communications network. See also distributed file management.

Distributed Database Management System (DDBMS)
A database physically stored in two or more computer systems. Although geographically dispersed, a distributed database system manages and controls the entire database as a single collection of data.

distributed data facility (DDF)
A set of DB2 for z/OS components through which DB2 for z/OS communicates with another RDBMS.

distributed data interface (DDI)
An optical fiber-based LAN using the ANSI X3T9.5 standard for a token-passing ring MAC protocol and its physical attachments. Stations, concentrators, and bridges in a DDI network are physically connected to one or both of a pair of counter-rotating rings operating at 100Mbps. The term DDI is used to represent all LAN types based on the fiber distributed data interface (FDDI) specifications, regardless of the media used (optical fiber, copper, or shielded twisted pair).

distributed data management (DDM)
A function of the operating system that allows an application program or user on one system to use database files stored on remote systems. The systems must be connected by a communications network, and the remote systems must also be using DDM.

Distributed Data Management Architecture (DDM Architecture)
A connection protocol that enables communication between a system that uses distributed file management and a system that uses distributed relational database architecture.

distributed data management attribute
An attribute that is used in addition to those required for local z/OS data access. Some examples of associated DDM attributes are file size, hidden file, and lock options.

Distributed Directory Architecture
Directory architecture in a Domino domain in which all servers use a local primary Domino Directory.

distributed directory database
The complete listing of all the resources in the network as maintained in the individual directories scattered throughout an APPN network. Each node has a piece of the complete directory, but it is not necessary for any one node to have the entire list. Entries are created, modified, and deleted through system definition, operator action, automatic registration, and ongoing network search procedures.

distributed eXtreme Scale
A usage pattern for interacting with eXtreme Scale when servers and clients exist on multiple processes.

distributed file

  1. A file that can be accessed by remote applications or remote users.
  2. A file that physically resides on more than one computer in a network.

distributed file management
A function of the operating system that allows an application program or user on one system to use database files stored on remote systems. The systems must be connected by a communications network, and the remote systems must also be using distributed file management. See also distributed database.

Distributed FileManager
An implementation of target (server) support as defined by distributed data management (DDM). DDM permits systems in an extended enterprise that have DDM source (client) capability to access file data on a target MVS system. See also extended enterprise, source, target.

Distributed File Service (DFS)

  1. A component of a Distributed Computing Environment (DCE) that enables a single, integrated file system to be shared among all DCE users and host computers in a DCE cell. DFS prevents DCE users from simultaneously modifying the same information.
  2. A base element of z/OS that allows users to access and share data in a distributed environment across a wide range of IBM and non-IBM platforms.
  3. A service that provides data access over IP networks.

distributed file system (DFS)
A file system that is composed of files or directories that physically exist on more than one computer in a communications network.

distributed function mode
See distributed function terminal.

distributed function terminal (DFT)

  1. A workstation that performs operations previously accomplished by the processing unit, such as managing data links, controlling devices, and formatting data.
  2. A protocol used for communication between a terminal and an IBM control unit that supports multiple, concurrent, logical, terminal sessions.

distributed host command facility (DHCF)
A function of the operating system that supports the data link between a System/370 terminal using a System i application in an HCF (Host Command Facility) environment.

distributed identity
User identity information that originates from a remote system. The distributed identity is created in one system and is passed to one or more other systems over a network.

distributed identity filter
A mapping association between a RACF user ID and one or more distributed user identities which is stored in a general resource profile. A distributed identity filter consists of one or more components of a distributed user's name and the name of the registry where the user is defined.

distributed ledger technology (DLT)
Blockchain technology that allows any participant in the network to see the records of ledgers for all the participants in the network.

distributed library
An underlying physical library in a Peer-to-Peer Virtual Tape Server (PtP VTS) subsystem.

distributed management environment (DME)
A specification of the Open Software Foundation (OSF) for managing open systems.

Distributed Management Task Force (DMTF)
An alliance of computer vendors that was convened to define streamlined management of the diverse operating systems commonly found in an enterprise.

distributed network
A connected group of workstations that use the IBM Workload Scheduler distributed engine to perform workload scheduling. See also engine, workstation.

distributed network directory
See distributed directory database.

distributed presentation management (DPM)
An MFS option that allows programs to communicate with device independence by sharing message formatting functions between MFS and a user-written remote program. The user-written remote program performs device-dependent formatting.

Distributed Print Function (DPF)
A component of Infoprint Manager for Windows that can be installed and used to print jobs from OS/390, z/OS, VSE, VM, or OS/400 systems.

distributed printing
See remote printing.

distributed print system
A computer system that interchanges print data across different computing environments, allowing data to be printed on a system other than the one that the print request was generated. For example, in host-to-LAN distributed printing, data that resides on the host is printed on printers attached to a local area network (LAN).

distributed processing
Processing in which resources or functions are dispersed among two or more interconnected processors, typically over a network.

distributed program link (DPL)
A function of CICS intersystem communication that enables an application program to ship LINK requests to another application program on a different instance of CICS.

distributed property management
A set of component objects that are used for managing the settings and configurations for projects and applications.

Distributed Protocol Interface (DPI)
An extension to the Simple Network Management Protocol (SNMP) agent that permits users to dynamically add, delete, or replace management variables in the local Management Information Base (MIB) without requiring recompilation of the SNMP agent.

Distributed Protocol Interface API (DPI API)
In the Simple Network Management Protocol (SNMP), a program interface for a subagent that provides an extension to the function provided by the SNMP agent.

distributed publish/subscribe
Publish/subscribe messaging performed in a multiple queue manager environment.

distributed query
A query that accesses data from a database other than the current database. See also coordinating server.

distributed queue management
In message queuing, the setup and control of message channels between distributed queue managers.

distributed queuing
Sending messages from one queue manager to another. The receiving queue manager could be on the same machine or on a remote one.

distributed RAID
An alternative RAID scheme where the number of drives that are used to store the array can be greater than the equivalent, typical RAID scheme. The same data stripes are distributed across a greater number of drives, which increases the opportunity for parallel I/O and hence improves overall array performance. See also rebuild area.

distributed recovery
Resource recovery in which the resources and participants reside on multiple systems.

distributed relational database
A database whose tables are stored on different but interconnected computing systems.

Distributed Relational Database Architecture (DRDA)
The architecture that defines formats and protocols for providing transparent access to remote data. DRDA defines two types of functions: the application requester function and the application server function.

Distributed Replicated Block Device (DRBD)
A block device driver that mirrors the content of block devices (hard disks, partitions, logical volumes, and so on) between servers.

distributed request
In a federated system, an SQL query directed to two or more data sources.

distributed routing model
A "peer-to-peer" dynamic routing system, in which each of the participating CICS regions can be both a routing region and a target region. The distributed routing model is implemented by the distributed routing program.

distributed routing program
A user-replaceable program that can be used to dynamically route BTS processes and activities, and transactions started by non-terminal-related EXEC CICS START commands.

Distributed Server Architecture (DSA)
An architecture that links multiple servers to provide full redundancy in case of failure.

distributed shell (dsh)
A program that can issue commands to all systems in a network, in parallel.

distributed software (DSW)
Software that runs on personal computers, workstations, or servers, rather than on mainframes. See also distributed.

distributed sync point resource manager (DSRM)
A resource manager that extends protection to resources across multiple nodes using a peer-to-peer protocol.

Distributed System License Option (DSLO)
An option available to IBM customers with a basic license that permits them to copy certain IBM-licensed materials for the purpose of installing multiple systems.

distributed systems node executive (DSNX)
A function of the operating system that receives and analyzes requests from the NetView Distribution Manager licensed program on a host system. If the request is directed to the system that receives it, the request is processed on that system or on a personal computer directly attached to that system. If the request is intended for a different system, it is routed toward its destination.

Distributed Time Service (DTS)
A Distributed Computing Environment (DCE) component that provides a way to synchronize the times on different hosts in a distributed system.

distributed transaction

  1. A transaction that affects data on multiple nodes. The nodes can be on one system or across multiple systems.
  2. A transaction that updates data in more than one database, user process, or machine. See also two-phase commit, XA.

distributed transaction processing (DTP)
A process that enables a CICS transaction to communicate synchronously with a transaction running in another instance of CICS.

distributed unit of work (DUW)

  1. In a distributed process, all processing between two sync points taken by two or more intercommunicating transactions using a two-phase commit protocol. A DUW is a distributed LUW.
  2. A unit of work that allows SQL statements to be submitted to multiple relational database management systems, but no more than one system per SQL statement.

Distributed Voice Technologies (DVT)
A component of DirectTalk that provides an interface to allow you to integrate your own voice technology (such as a speech recognizer) with your DirectTalk system.

distributed workstation
A workstation on which jobs and job streams are run using the distributed engine. See also engine, workstation.

distributing host
The designated contact (point of entry) for a sysplex. The distributing host is the normal owner of the IP address that clients in the network use to connect to the sysplex. See also backup host.


  1. The target for a notification of events that are generated by the system. For example, a distribution can be email addresses, FTP sites, or other customized locations.
  2. A software package that is ready to install. A distribution often refers to a Linux package that contains the Linux operating system, an installation program, utilities, and documentation.
  3. A set of reports contained in a bundle and have the same recipient list.

distribution array
An arrangement of entries that indicates the number of records that are hashed into a hash index. See also distribution file.

distribution catalog
A list of objects, with references to their locations and associated object characteristics.

distribution center (DC)
A physical location where goods are stored for distribution to buyers.

distribution document
An internal document that contains the document content and the document details for a distribution, such as a note or document.

distribution file
A file that stores a distribution array. See also distribution array.

distribution group
A set of nodes or organizations defined for distributing products or services.

distribution ID
A unique identifier for each distribution. A distribution ID has two components: the distribution name, a 1- to 8- character alphanumeric string and the distribution description, a one to 55-character string.

distribution key
An ordered set of one or more columns in a table. The values in the distribution key columns are used to determine the database partition to which each table row belongs. See also database partition, table-partitioning key.

distribution library (DLIB)
In z/OS, a data set from which a product is copied to the target library (TLIB) during installation.

distribution list

  1. A list of queues to which a message can be put with a single statement.
  2. A global list of mailbox server mailboxes. A distribution list can be used by all mailbox users. Instead of addressing messages to each individual, the individual mailboxes can be grouped into a distribution list.
  3. In voice mail, a list of subscribers to whom the same message can be sent.
  4. A list of system distribution directory entries, which allows users to send messages, notes, and documents to a group of users in one step.

distribution map
A map that specifies an array of database partition numbers that is used to distribute data among the database partitions of a database partition group. The array of database partition numbers distributes the data by using a hashing algorithm.

distribution media

  1. The medium on which the operating system software, a licensed program, or an application program is distributed to the user. The distribution medium can be any of several different media supported by the hardware, such as streaming cartridge tape, 9-track tape, or 3.5-inch diskette.
  2. The media that a central site creates and distributes to target systems. See also installation media.

distribution policy
A load-balancing policy that can be specified for a resource group and that the application uses to place resource groups on a node when a node joins a cluster. See also resource group, resource group policies, startup.

distribution preference
A network-wide attribute that controls the placement of the service IP label aliases on the physical network interface cards on the nodes in the cluster. Configuring a distribution preference customizes the load balancing for service IP labels in the cluster, taking into account the persistent IP labels previously assigned on the nodes. See also anti-collocation, collocation, collocation.

distribution processor
A set of ODF programs that perform the task of initiating print processing based on the criteria of the distribution method and the settings of the wait/ignore indicator for bundle components.

distribution queue
In SNADS, a list of documents or mail waiting to be sent to users or libraries on remote systems.

distribution recipient index
See distribution recipient queue.

distribution recipient queue
An internal object that contains entries for incoming object distributions; incoming document distributions, such as files, notes, or messages; outgoing document distributions; and error distributions.

distribution repository
In Managed System Services, a staging area for objects that are to be sent or have been received. Objects are loaded into the repository to be sent to managed systems at a later time.

distribution requisite fix
A temporary solution to or a bypass of a problem that is necessary to provide a complete solution to correct a problem. The system allows you to apply the distribution requisite fix either before the PTF that needs it, with the PTF that needs it, or after the PTF that needs it. See also corequisite fix, prerequisite fix.

distribution resource planning (DRP)
A framework to plan and manage finished goods inventory in a distribution network comprising multiple stocking locations for hundreds of SKUs.

distribution rule
A business rule established for the shipping or receiving node determination process. Distribution rules are used to associate inventory items with a specific shipping or receiving node.

distribution service level
In SNADS, the combination of priority, capacity, and protection requirements that must be satisfied to receive or send a distribution. SNADS has service levels of fast, status, data high, and data low. Items with a service level of fast, status, or data high are put on the priority queue. Items with a service level of data low are put on the normal queue.

distribution services
The support provided by the operating system to receive, forward, and send electronic mail in an SNA network.

distribution summary array
An array that includes a distribution array and a distribution map and that indicates the number of records that are hashed into a database partition.

distribution tracking object
An internal object that is used to control electronic mail.

distribution zone
In SMP/E, a group of VSAM records that describe the structure and contents (that is, the system modifications and elements) of a set of distribution libraries.

distributor node
A node that is operated by technical personnel for which distributors perform customer support and system maintenance.

See Darwin Information Typing Architecture.

In computer graphics, a technique of interleaving dark and light pixels so that the resulting image looks smoothly shaded when viewed from a distance.

The process of re-directing items from the normal workflow to perform special operations such as quality inspection or pre-packaging prior to putaway.

diverted theme line
A theme line that is attached to an event frame such that when the event frame is moved, the theme line maintains its vertical position with respect to the frame. See also event frame, theme line.

dive strategy
An approach taken by CPLEX in probing child nodes below the current level in the tree before deciding which node to follow during branch and cut.

An administrative unit.

division header
In COBOL, the reserved words and punctuation that indicate the beginning of one of the four divisions of a COBOL program.

DIX protocol
See Digital Intel Xerox protocol.

See dependent job control.

DJC network
See dependent job control network.

DJ facility
See dump job facility.

See discovery library adapter.


  1. See data link control.
  2. See Data Link Control protocol.

See data link connection identifier.

DLC layer
See data link control layer.

DLE character
See data link escape character.

DLF object
An object that contains data from a single data set managed by Hiperbatch.

See Data Language/I.

DL/I address space
An address space that is used by the online IMS control program to contain most of the DL/I code and control blocks. This option can be selected for the online IMS environment to provide an alternative virtual storage configuration.

See distribution library.

DL/I interface block (DIB)
A block containing variables automatically defined in an application program using HLPI to receive information passed to the program by DL/I during execution. A block automatically inserted into a program by the DLI command translator. Whenever a program issues an EXEC DLI request, DLI responds by storing information in the DIB.


  1. In Analyst, a link that copies information in and out of cubes, and sometimes to and from text or ASCII files.
  2. The optical connections between supernodes for forming an HPC cluster.

See DLI separate address space.

DLI separate address space (DLISAS)
A component of DBCTL that resides in the IMS address space. It is a separate address space that contains DL/I code, control blocks, buffers for DL/I databases and program isolation.

D-list format
A format that allows the user to enter text from another D-list in a row or a column. The format may be used in database-type functions to consolidate data in a similar manner to query-style reports.

See dynamic link library.

See document library object.

See data loss prevention.

See dynamic LPAR.

See dead-letter queue.


  1. See Data Link Service.
  2. See dynamic load sharing.

See Data Link Service access point.

DLS provider
In X.25 communications, the data link layer protocol that provides the services of the Data Link Provider Interface (DLPI).

DLS user
In X.25 communications, the user-level application or user-level or kernel-level protocol that accesses the services of the data link layer.

See data link switching.

See distributed ledger technology.


  1. See dependent logical unit.
  2. See destination logical unit.


  1. See dependent LU requester.
  2. See dependent logical unit requester.

See dependent LU server.


  1. See data management.
  2. See NetView Distribution Manager.
  3. See disconnected mode.

See direct memory access.

See data management application program interface.

DMA slave
A device on the Micro Channel bus that uses the system-provided DMA facilities instead of having a built-in controller. See also bus master.


  1. See data management block.
  2. See direct memory buffer.

See DMB element.

DMB element (DMBE)
The portion of a DMB that is associated with a specific TCP connection. Each DMB is partitioned into one or more DMBEs.


  1. See distributed management environment.
  2. See Device Management Enablement.

See Desktop Management Interface.


  1. See Data Manipulation Language.
  2. See definitive media library.

DM Multipath
See Device-Mapper Multipathing.

See Data Management Object Model.

See dimensional modeled relational data.

See dynamic message sign.


  1. The custom ISDN protocol implemented on the DMS100 switch, providing 23 B-channels and a D-channel over a T1 trunk.
  2. A Northern Telecom switch.

DMS table space
See database-managed space table space.

See Distributed Management Task Force.

See demilitarized zone.

See distinguished name.

See Digital Network Architecture.

See data network identification code.

See dialed number identification service.


  1. See domain name server.
  2. See Domain Name System.

See DNS Blackhole list.

DNS Blackhole list (DNSBL)
A spam blocker that allows a website to publish IP addresses associated with spamming. The DNSBL has different levels of spam protection, such as Strong or Medium.

DNS domain database file
A configuration file that contains information about the domain, such as resource records, that a server administers.

DNS server
See Domain Name System server.

DNS server cache
Periodically updated information on a name server that contains data about the domain that the name server administers.

DNS zone transfer
A transaction that replicates a Domain Name System (DNS) database.

See derived object.

See document ID.

A receiving location in the warehouse. Typically an elevated location where a trailer or truck backs up to unload inventory.

dock appointment
A scheduled appointment to receive inbound shipments or ship outbound shipments from the warehouse dock.

dock door
An overhead door with access to the exterior of the building and equipment for loading/unloading trucks, trailers, and containers. A dock door can be designated receiving, shipping, or both.

An open platform that developers and system administrators can use to build, ship, and run distributed applications.

docket number
An item number for an agenda of the court.

dock to stock cycle time
The period of time between the receipt of a shipment at the dock door and the time at which the items in the shipment are placed in the storage location.


  1. A program written with the doclet API that specifies the content and format of the output to be generated by the Javadoc tool.
  2. An annotation tag that is inserted in the Java source as a Javadoc style comment and generates extensible application artifacts that are ready to be deployed. See also annotation tag.

See drawing order coordinate space.

See document store.


  1. An attachment of any medium such as a text file, a spreadsheet, graphics, videos, or a URL that can be appended to an element in the work breakdown structure (WBS), a resource record, scope element or requirement.
  2. A Notes database entry that users create by using a form on the Create menu. Documents consist of fields, text, numbers, graphics, and so on. Information may be entered by a user, automatically calculated by formulas, imported from other applications, or linked to another application and dynamically updated.
  3. Any collection of data stored in a document object. A document can contain any type of data. See also document library object.
  4. A machine-readable collection of one or more objects that represent a composition, a work, or a collection of data.
  5. A logical structure that a CICS transaction can use to manipulate text or other structured information. See also document template.
  6. An object saved in an object store or library. Documents have properties and security, and may additionally have content, versions, lifecycles, and subscriptions.
  7. An entity that carries information through a configured workflow process, such as an order, a quote, or a return.
  8. In ANSI, a business document, such as a purchase order or invoice, that can be represented in any supported format. For example, an XML purchase order and an EDI purchase order are both documents, but each uses a different format. See also message.
  9. An archived file and its accompanying metadata.
  10. An item that can be stored, retrieved, and exchanged among Content Manager systems and users as a separate unit. It can be any multimedia digital object. A single document can include varied types of content, including for example, text, images, and embedded artifacts. See also work basket, workflow.

document access definition (DAD)
An XML document format used by DB2 XML Extender to define the mapping between XML and relational data.

document access definition extension (DADX)
An XML document format that specifies how to create a web service using a set of operations that are defined by DAD documents and SQL statements.

document administrator

  1. In DCF, a person who is responsible for defining markup conventions and procedures for an organization.
  2. The person who defines, organizes, manages, controls, and protects documents. (T)(A)

document authority
The definition of what actions a user can perform on a document.

document class

  1. A user-defined character string, 1 through 16 characters long, that characterizes a document. It can be used to search for a filed document. For example, a document that is a memo could have a document class of MEMO; a document that is a report, REPORT.
  2. A category for documents in an object store or library. Every document belongs to a document class, such as Purchase Orders. The document class determines the properties, storage location, security, lifecycle, and versioning of the document. See also desktop form template document class, form data document class, form policy specification document class, form proxy custom object class, form template, form template document class, root class.

document classification action
A root class that allows developers to create classifiers to examine and automatically map the contents of documents of a specific MIME type to a target document class.

document collection
See data collection.

document component
In architecture, an architected part of a document data stream. Examples of document components are documents, pages, page groups, indexes, resource groups, objects, and process elements.

Document Composition Facility (DCF)
An IBM licensed program used to format input to a printer.

Document Content Architecture (DCA)
An architecture that guarantees information integrity for a document being interchanged in an office system network. DCA provides the rule for specifying form and meaning of a document. It defines revisable form text (changeable) and final form text (unchangeable).

Document Control Facility (DCF)
An IBM Notes-based content management application. It allows teams to create and manage a number of content types using a simple automated workflow mechanism.

document conversion processor
A computer program that processes a machine-readable document that includes formatting controls written in one formatter language, to produce a machine-readable document that includes formatting controls appropriate for another formatter language.

document description
The 1- through 44-character description of a document, assigned by the user when creating or filing the document.

document detail
Data that describes a characteristic of a document. For example, a detail can be document type, subject, author, or date created.

document details
A comprehensive display of the most complete sets of data that is available on a chosen object.

document element

  1. See structured field.
  2. The outermost element of an XML document or fragment.

document envelope
A structure that is applied to a document to prepare it for exchange between trading partners.

document environment group
In PSF, an internal object (a required part of every form definition) that identifies suppression usage, identifies overlays to be used, and defines the placement of one or more pages on the form.

document exchange record
A record that describes properties of the documents and messages passed between trading partners.

document fidelity

  1. The degree to which a document presentation preserves the creator's intent.
  2. The ability to faithfully replicate a document.

document format
The selected arrangement of text for a specific document.

document formatting
The arrangement or layout of information on a presentation space or a physical medium.

document ID (DOCID)
A value that uniquely identifies a row that contains an XML column. This value is stored with the row and never changes.

Document Interchange Architecture (DIA)
The rules and structure for the exchange of information between office applications. Document Interchange Architecture includes document library services and document distribution services.

document interchange session
The environment that allows office system users and System i Access users to request document library and distribution services from the host system.

document layout
A set of all the form layouts for the application in the sequence in which they are used. Document layout determines the set of global resources for the document, including fonts and page segments, and determines the fields that make up the application data records.

document library

  1. The entire collection of documents and folders on a system.
  2. A set of VSAM data sets, accessible in a batch environment, that contain documents and related files.

document library object (DLO)
Any system object that resides in the document library, such as RFT and FFT documents, folders, and PC files. See also document.

document library services
The services defined by the Document Interchange Architecture (DIA) to work with objects filed in the DIA document library. On the system, it is the support that lets users work with the contents of the document library.

document literal wrapped
A convention or style that is used to structure a web service definition to generate a SOAP message that is WS-I compliant and can be easily validated.

document map
In a workflow policy, a map that allows property mapping between form template cells and document class properties for workflow and document policies.

document mode
A default display mode for formal modules. Data is displayed in a table with rows and columns.

document model
The definition of the structure of a document in terms of the sections that it contains. DB2 Net Search Extender uses a document model when indexing.

document name
The 1- through 12-character name for documents in folders, assigned by the user when creating the document. See also document object name.

document number
The number assigned to a printed document when a user files that document. The first two digits of the document number are the year, and the last five are in sequence, with the most recent documents having the highest number. For example, the fifth printed document filed in 1989 would have the number 89-00005.

Document Object Model (DOM)
A system in which a structured document, for example, an XML file, is viewed as a tree of objects that can be programmatically accessed and updated. See also Simple API for XML.

document object name
The 10-character name of a document assigned by the system when a user files the document. See also document name.

document of understanding (DOU)
A formal document that defines the terms of a relationship between a consumer of a service and the provider of that service.

document order
In XQuery, an ordering among the nodes in a node hierarchy that corresponds to the order in which the nodes would appear if the node hierarchy were serialized in XML format.

document outline
A reference document or template used to create new documents. See also document type.

document policy
A specification that indicates which form template and form data entry template are used for the policy, how mapping is configured between form template fields and document class properties, and any special property settings or security features. See also form policy, form policy specification document class, form template, form template document class.

document presentation
The transformation of formatted information to a visible form on a presentation surface or a physical medium.

Document Printing Application (DPA)
An OSI standard (ISO/IEC 10175) that addresses those aspects of document processing that enable users in a distributed open systems environment to send electronic documents to shared, possibly geographically-dispersed, printers.

document processing
In word processing, performing operations on one or more documents, such as entering, rearranging, sorting, merging, storing, retrieving, displaying, and printing text.

document protection level
A setting that determines whether archived documents can be deleted before the end of their retention period and if retention periods can be reduced.

document retention
A company's program or practice of retaining documents and information to comply with various state, federal, and international statutes and laws. The practice is used to serve their business interests by retaining information important to the corporation.

document root directory
The primary directory in which a web server stores accessible documents. When the server receives requests that do not point to a specific directory, it tries to serve the requests from this directory.

document routing process
In Content Manager a sequence of work steps, and the rules governing those steps, through which a document or folder travels while it is being processed. See also work step.

document rule
For file archive collections, a policy object that is used to associate documents with service classes.

document search
A query form that is used to search for documents.

document sharing
A method of collaboration that allows all participants in an online meeting to view documents simultaneously.

document store (docstore)
The area of a file system or database where all system files are stored. Any file that is imported, exported, or generated by the system is stored in the docstore.

document summary
The resultant sortable list of records that match a document search.

document template
A unit of information that is used to construct a document. A document template can contain fixed text, and symbols that represent text whose value is supplied by an application program. See also document.

document type

  1. A template for a specific type of requirements document. The document type uses the document outline and specifies the filename extension. See also document outline.
  2. The type of data in a particular Printing Systems Manager (PSM) document. For example, a print file document contains only printable data, and a print resource document contains only data such as fonts or form definitions that are not printable.
  3. A classification that helps to organize and classify documents that belong to a specific case. Properties can be assigned to a document type to provide additional information about the documents. An example of a document type is a job application form.
  4. A document that is defined by a specific XML template that has been designed to support a specific transaction set or business process. The document type defines possible processes and system behaviors that occur as the document goes through its life cycle.

document type declaration
A markup declaration that contains the formal specification of the document type definition.

document type definition

  1. The definition of a non-Document Interchange Architecture (DIA) document user type that identifies the document type number, name, and text associated with the document.
  2. The rules that specify the structure for a particular class of SGML or XML documents. The DTD defines the structure with elements, attributes, and notations, and it establishes constraints for how each element, attribute, and notation can be used within the particular class of documents.

document type set
A value that allows a logical grouping of document type definitions. Document type sets include the name and the description. A set can contain one or more document types or it can be empty.

document unit object
An internal object that contains the document content and the document details.

Document Verification Testing (DVT)
A review for correct appearance, truncation, links, and consistency of a translation.

See direct outward calling.

See device output format.

See bookmark.

A social bookmarking service that allows users to centrally store, categorize, and share a set of personal bookmarks. Users can assign multiple tags to organize their bookmarks. See also folksonomy, social bookmarking, tag.

DO group

  1. A set of commands in a control language program defined by a DO command and an ENDDO command that is conditionally processed as a group.
  2. In RPG, a group of calculations done one or more times based on the results of comparing factor 1 and factor 2 of certain calculation operations (for example, DOUxx). A DO operation and an END operation are the delimiters for a do group.

See Domain of Interpretation.

Dojo Toolkit
A JavaScript library that is used to create applications across platforms.

DO loop
A range of statements run repetitively by a DO statement.


  1. See Disk on Module.
  2. See Document Object Model.


  1. A partition of the management space of an appliance.
  2. A functionally isolated area of the CICS system that owns resources to which it has sole access and that communicates with other parts of CICS through strictly defined interfaces called gates.
  3. A collection of entities related to a specific purpose or function.
  4. An individual division of a major operation, which generally matches the organization structure and the expertise of the people involved. For example, a city authority is divided into departments dealing with transportation, water, and public safety.
  5. A set of systems that allocate shared network resources within a single logical system.
  6. In a database, the set of valid values for an attribute.
  7. A logical grouping of resources in a network for the purpose of common management and administration. See also federation domain.
  8. A part of a network that is administered as a unit with a common protocol.
  9. The set of potential values that a variable can assume.
  10. An object, icon, or container that contains other objects representing the resources of a domain. The domain object can be used to manage those resources.
  11. In TCP/IP, a named set of hosts. Each domain has authority for the machines within that domain, but not for machines in other domains.
  12. A characteristic of an object that controls which programs can access the object. See also system domain object, user domain object.
  13. Part of a naming hierarchy that specifies the route. For example, example.com. In Bluemix, domains are associated with orgs. Domain objects are not directly bound to apps. See also custom domain, host, organization, route, subdomain, Uniform Resource Locator.
  14. In the Internet, a part of a naming hierarchy in which the domain name consists of a sequence of names (labels) separated by periods (dots).
  15. A named group of workstations in a distributed Tivoli Workload Scheduler network, consisting of one or more agents and a domain manager acting as the management hub. All domains have a parent domain except for the master domain. See also domain manager, full status, master domain manager.
  16. In communications, the network resources under control of a particular system services control point (SSCP).
  17. A set of data on which conflict analyses are carried out. It can be identified by a set of applications (or by a set of permissions that are related to applications). A single application can be included in several domains.
  18. A subnetwork of clients and servers under the control of one security database.
  19. In information analysis, the set of data in a column.
  20. A grouping of client nodes with one or more policy sets, which manage data or storage resources for the client nodes. See also policy domain.
  21. A list of defined values from which users choose an appropriate value.
  22. A URL to which standard contact replies can be sent, with response handlers. Multiple domains can be set up to provide different response handlers for different types of mailings.

domain administrator
The owner of an administrative domain.

domain analysis
A data analysis where the values of columns are identified and marked as invalid values.

Domain Configuration tool
A Notes application that configures on-premises Domino servers to connect to SmartCloud Notes servers.

domain controller
For a Windows NT Server or Windows 2000 Server domain, the server that authenticates domain logons and maintains the security policy and the security accounts master database for a domain. Domain controllers manage user access to a network, which includes logging on, authentication, and access to the directory and shared resources.

domain-defined attribute
In OSI X.400, an attribute of the X.400 originator/recipient name that permits a System i product to keep existing addressing conventions. The System i product uses the domain-defined attributes to carry the user ID and address (the two-part network name used in SNADS).

domain gate
An entry point or interface to a CICS domain. A domain gate can be called by any authorized caller who needs to use some function provided by the domain.

domain inspector
A specialized inspector that is designed to deconstruct and extract forensics data from specific domain websites such as Facebook or Gmail.

domain layer
See services tier.

domain manager
An installed component in a distributed Tivoli Workload Scheduler network that is the management hub in a domain. All communication to and from the agents in the domain is routed through the domain manager. See also backup domain manager, domain, workstation.

domain manager domain
Major component of CICS responsible for maintaining, through the use of catalog services, permanent information about individual domains.

domain model
A business object model that focuses on products, deliverables, or events that are important to the business domain. A domain model omits individual worker responsibilities.

domain name
In Internet communications, a name of a host system. A domain name consists of a sequence of subnames that are separated by a delimiter character, for example, www.ibm.com. See also Domain Name System.

domain name server (DNS)

  1. An Internet service that translates domain names into IP addresses.
  2. A server program that supplies name-to-address conversion by mapping domain names to IP addresses.

domain name space
All of the names in the Domain Name System (DNS).

domain name suffix
The extension on a web or email address which indicates the type of organization associated with the domain name.

Domain Name System (DNS)
The distributed database system that maps domain names to IP addresses. See also domain name, name resolution.

Domain Name System server (DNS server)
A computer or server that matches an IP address to a domain name.

Domain of Interpretation (DOI)
A group of related protocols that uses the Internet Security Association and Key Management Protocol (ISAKMP) to negotiate Security Associations (SAs). A DOI defines payload formats, exchange types, and conventions for naming security-relevant information such as security policies and cryptographic algorithms and modes.

domain operator
In a multiple-domain network, the person or program that controls operation of resources controlled by one system services control point (SSCP). See also network operator.

domain reduction
The removal from the domain of a variable of values that do not satisfy the constraints on the variable (and thus cannot be part of a solution).

domain search
A search that is initiated by a network node to all its authorized client APPN end nodes when it receives a search request for which it has no entry in its database.

domain term
A group of usually consecutive subject-specific terms that can be mechanically recognized and annotated by the text analyzer without the context of the sentence structure. Domain terms can be built into two types of dictionaries, one being a standard format lexical dictionary, another being multiword format dictionary.

DOM capture
A feature of IBM Tealeaf that enables the client to capture the Document Object Model of a web page. In IBM Tealeaf, replaying the DOM provides "truer" replay experience because it uses the exact DOM that the user saw at the moment of capture, rather than a simulation produced by a rendering engine.

DOM element
One member of a tree of elements that is created when an XML file is parsed with a DOM parser. DOM elements make it easy to quickly identify all elements in the source XML file.

Pertaining to a security label relationship in which the security level and set of security categories of one label is equal to or greater than the security level of the second. See also disjoint, equivalent.

dominant table
A table that has its data preserved over the course of an outer join.

Domino Application Services
Services that enable the Sametime server to function in a Domino environment as part of a Domino domain. The Domino Application Services support IBM Notes access to the Sametime server, the Directory, Replication features, and security for Notes clients. The Web Application Services and Domino Application Services are sometimes collectively referred to as Domino DNA.

Domino connector
A function of the HTTP Server for i5/OS licensed program that enables Lotus Notes users to access the Internet and to use all of the HTTP Server functions. Specifically, a Domino connector enables Lotus Notes users to combine Notes with e-business applications.

Domino Designer
An application development tool for modernizing existing or building new collaborative applications that run on IBM Notes and Domino. Domino Designer includes XPages, which allows developers to use HTML, CSS, and JavaScript skills along with a set of modern web controls, Dojo, and built-in Ajax services to build applications for Notes and Domino desktop, mobile, or web use.

Domino directory
A database that provides a domain-wide directory of Domino servers, users, certifiers, foreign domains, and groups. It also contains documents that manage server-to-server communication and server programs.

Domino Document Manager cabinet
A Domino Document Manager database that is used to organize documents. Cabinets hold Domino databases.

Domino Document Manager library
A Domino Document Manager database that is the entry point to Domino Document Manager.

Domino domain
A network of clients and servers whose users, servers, connections, and access control information are described in a Domino directory.

Domino for i5/OS
See Lotus Domino for i5/OS.

Domino Internet Inter-ORB Protocol (DIIOP)
A server task that runs on the server and works with the Domino Object Request Broker to allow communication between Java applets created with the Notes Java classes and the Domino server. Browser users and Domino servers use IIOP to communicate and to exchange object data.

Domino server
A computer that runs the Domino Server program and stores Notes databases.

Domino server program
The program that supports the connection between clients and the server and also manages a set of server tasks, which are programs that either perform schedule-driven database chores -- such as routing messages to mailboxes and updating user accounts -- or connect various types of clients -- Notes clients, web browsers, CORBA clients -- to the server.

Domino Server setup program
The cross-platform wizard that guides a user through the setup options for a Domino server after the program files are installed on the system.

Domino XML (DXL)
A version of XML that describes Domino-specific data and design elements such as embedded views, forms, and documents.

donut chart
A circle graph with a hollow centre that is used for comparing the parts of a whole to the whole. The segments of the hollow circle represent the parts, and the length of each segment represents a proportion of the whole. See also pie chart.

DOORS extension language (DXL)
A scripting language used in Rational DOORS.


  1. See data-owning region.
  2. See Digital Offering Rep.

dormant connection
A connection that is suspended and that is not used by SQL statements. See also SQL connection.

dormant schedule
A schedule associated with a deleted or unlabeled version of a job. A dormant schedule cannot be used until it is associated with a valid labeled job version.

dormant state
In DB2 for i5/OS, the state of a connection when the connection is suspended. While in the dormant state, no SQL statements use the connection except for commits and rollbacks. See also current state.

See denial-of-service attack.

See disk operating system.

DOS bit
On a volume without an indexed volume table of contents (VTOC), a bit that indicates that the free space map is invalid.

DOS partition
In the NetView/PC program, a separate area of memory in which NetView/PC programs and other DOS programs can be serially executed.

DOS session
A session that supports the independent running of a DOS program. The DOS program appears to run independently of any other programs in the system.

do statement
For the C and C++ compilers, a looping statement that contains the keyword do, followed by a statement (the action), the keyword while, and an expression in parentheses (the condition).

A symbol (.) that indicates the current directory in a relative path name. See also period.

dot dot
A symbol (..) in a relative path name that indicates the parent directory.

dot leader
A set of periods that fills in the space between two pieces of split text such as a chapter title and its page number in a table of contents.

dot matrix

  1. In word processing, a pattern of dots used to form characters.
  2. In computer graphics, a two-dimensional pattern of dots that are used for designing an image on the display.

dot matrix printer
A printer that prints characters or images represented by dots.

dot pitch
A measure of display resolution on a color display, expressed as the distance between phosphor dots of the same color.

dots per inch

dotted decimal format
Consisting of four numbers, each up to three digits long, separated by periods. The format of IPv4 addresses.

dotted decimal notation
The syntactical representation for a 32-bit integer that consists of four 8-bit numbers written in base 10 and separated by dots. IP addresses are represented in dotted decimal notation. See also octet.

See document of understanding.

double buffer mode
In GL, a mode in which two buffers are alternately displayed and updated. A new image can be drawn into the back buffer while the front buffer (containing the previous image) is displayed.

double-byte character
An entity that requires two character bytes.

double-byte character large object (DBCLOB)
A data type whose value is a sequence of double-byte characters that can range in size from 0 bytes to 2 gigabytes less 2 bytes. In general, the DBCLOB data type is used whenever a graphic string might exceed the limits of the VARGRAPHIC data type. See also large object.

double-byte character session
A display station operating session that uses double-byte character data for the system to communicate with the operator.

double-byte character set (DBCS)
A set of characters in which each character is represented by 2 bytes. These character sets are commonly used by national languages, such as Japanese and Chinese, that have more symbols than can be represented by a single byte. See also multibyte character set, single-byte character set.

double-byte coded font (double-byte font)
A font in which the characters are defined by 2 bytes. The first byte defines the coded font section; the second byte defines the code point in the code page specified for that section.

double-byte font
See double-byte coded font.

To press and release a mouse button twice in rapid succession in order to perform an operation.

double-dot image
In printing, an image that is enlarged by doubling the pel pattern horizontally and vertically. See also double-dot technique.

double-dot technique
A technique in which the amount of data sent to the printer is reduced one-fourth by decreasing the number of picture elements. See also double-dot image.

A condition where a disk is servicing queries on its primary disk partition as well as its mirror disk partition because it is taking the place of a disk that has failed.

Double Metaphone
A phonetic algorithm that is used for indexing similar or identical names or words with variant spellings based on their English pronunciation. Double Metaphone is the second generation of Metaphone and includes indexing rules that account for spelling peculiarities from other languages. See also Metaphone, Metaphone 3, Soundex.

double opt-in
The process of a user subscribing to a mailing list or other email marketing messages by explicit request and then confirming that the email address is their own.

Pertaining to the use of two computer words to represent a number in accordance with the required precision.

double precision
The specification that causes a floating-point value to be stored (internally) in the long format (two computer words). See also single precision.

double-precision floating-point number
A 64-bit approximate representation of a real number. See also floating-point number.

double recording
The recording of certain individual events under two resource levels.

double right-click

double-sided printing
See two-sided printing.

The process of printing a character twice to create the appearance of bold type, used frequently with impact printers. A more flexible form of double-strike is emphasized printing.

double-tag interlock
See high-speed transfer.

To quickly touch a touchscreen display twice. Typically, mobile operating systems use double tap gestures similar to double clicks. See also gesture.

See trombone.

double-wide character
A character, such as a Kanji ideogram, that requires twice the nominal width of other characters, such as the letter A, for the character to be legible on a display screen or a printer.

double-wide print
A print format in which characters are twice as wide as they normally are.

A contiguous sequence of bits or characters that comprises two computer words and is capable of being addressed as a unit. See also halfword, word.

doubleword boundary
A storage location whose address is evenly divisible by 8. See also word boundary.

DO variable
In FORTRAN, a variable, specified in a DO statement, that is incremented or decremented on each iteration of the relative DO loop and controls the number of iterations of the loop.

do-while loop
A loop that repeats the same sequence of activities as long as some condition is satisfied. Unlike a while loop, a do-while loop tests its condition at the end of the loop. This means that its sequence of activities always runs at least once.

The condition in which a device is unusable as a result of an internal fault or an external condition, such as loss of power.

An object of a class that is cast to a more specific class in the inheritance hierarchy. See also casting, upcasting.

down fold
A fold that points down from the horizontal surface when fanfold forms are unfolded and held horizontally. Fanfold forms are alternately folded with up and down folds. See also up fold.

For Department of Defense (DoD), to lower a record classification from a higher classification to a lower classification. For example, to lower a record classification from Top Secret to Classified. A change in record classification can only be performed using either the upgrade, downgrade or declassify method.

downgraded cookie
A persistent cookie whose status has been changed to a session cookie.

The repetition of data from a higher level so that it can be represented at a child level.

Pertaining to devices that are below a controller, and controllers that are below a communications line in a communications configuration. See also upline.

To transfer data from a computer to a connected device, such as a workstation or personal computer.

downloaded fully described font
The IPDS form of a host font downloaded to a printer. PSF converts pairs of host font character sets and code pages into IPDS form before downloading to the printer for printing.

downloaded resource
In IPDS architecture, a resource in a printer that is installed and removed under control of a host presentation services program. A downloaded resource is referenced by a host-assigned name that is valid for the duration of the session between the presentation services program and the printer.


  1. Pertaining to the direction of the flow, which is from the first node in the process (upstream) toward the last node in the process (downstream). See also node.
  2. Pertaining to a direction that goes with the flow of a development process that moves from requirements to designs to implementation to tests. For example, tests are downstream from requirements. See also upstream.
  3. Pertaining to the direction of data flow, which is toward the destination of a transmission. See also upstream.

downstream device
For the IBM 3710 Network Controller, a device that is located in a network so that the 3710 is positioned between the device and a host.

downstream line
For the IBM 3710 Network Controller, a telecommunication line that attaches a downstream device to a 3710.

Downstream Load Utility (DSLU)
A licensed program that uses the communication network management (CNM) interface to support the load requirements of certain type 2 physical units, such as the IBM 3644 Automatic Data Unit and the IBM 8775 Display Terminal.

downstream physical unit (DSPU)
Any remote physical unit (data link, storage, or input/output device) attached to a single network host system.

down time
See mean time to recovery.

The time during which a functional unit cannot be used because of a fault within the functional unit or within the environment.

downward-growing stack
With Extra Performance Linkage (XPLINK), a stack that grows from high addresses to low addresses in memory.

See Document Printing Application.

See device page.

See destination point code.

See Delivery Project Executive.

See Distributed Print Function.

DPF host receiver
A component of DPF that communicates with the host PSF to receive and spool print jobs.

See Distributed Protocol Interface.

See Distributed Protocol Interface API.

See distributed program link.

See distributed presentation management.

See Display PostScript.

See data-partitioned secondary index.

See Direct Printer Services Subsystem.


  1. See data quality management.
  2. See dynamic query mode.

DQM function
A system-defined function and its associated parameters and default values that repair, clean, or standardize incoming data. See also DQM rule.

DQM rule
A rule that defines how data is processed by the data quality management (DQM) processes and DQM functions. DQM rules apply to specific UMF segments. A DQM rule includes the DQM function, the specific parameters, and the order in which the rule is processed. See also data quality management, DQM function, UMF segment.


  1. See dynamic reconfiguration.
  2. See definite response.

See database resource adapter.

See disaster recovery as a service.

The status of a contract that has neither been presented, executed, or withdrawn.

draft contract task
The original task of the internal contact when the contract is first created. It allows a user to present the contract, execute it, or perform additional actions.

draft order
An order that is still being created, and is not yet confirmed.


  1. To use a pointing device to move an object. For example, a user can drag a window border to make it larger by holding a button pointing device while moving the pointing device.
  2. In mobile computing, to hold and move an item on a touchscreen display. Typically, apps use drag gestures to move items from one place to another, such as moving an app into a folder of similarly themed apps. See also gesture.

drag-and-drop conference
A feature that allows a user to drag a name from the contacts list and drop it into an existing two-way call, converting the call into a multi-person conference.

See declustered RAID.


  1. The act of acquiring a locked resource by quiescing access to that object. See also claim, logical drain.
  2. To honor pending allocation requests before deactivating sessions with a partner logical unit. This applies to LU 6.2 only.
  3. An operator action to halt the flow of jobs to a printer, usually to stop the printer or to change print options.

drain approach
A migration approach in which users migrate artifacts to the new system and let the existing process instances in the old system run to completion. See also milestone-transfer approach.

drained state
The condition in which job flow to the printer is stopped until the operator enters a command, such as START, to begin sending jobs to the printer.

drain lock
A lock on a claim class that prevents a claim from occurring.

See dynamic random access memory.

DRA startup parameter table
Provides the parameters needed to define a DBCTL subsystem.

In Enhanced X-Windows, a property of windows and pixmaps when used as destinations in graphics operations. An InputOnly window cannot be used as a source or destination drawable in a graphics operation.


  1. A section in a palette that contains items that can be selected.
  2. A unit that contains multiple disk drive modules (DDMs) and provides power, cooling, and related interconnection logic to make the DDMs accessible to attached host systems.

draw function
In architecture, a function that can be done during the drawing of a picture for example, displaying a picture, correlation, boundary computation, or erasing a graphics presentation space.

A shape that has been added to a map layer.

drawing character
In System i Access, a keyboard character that is placed in the cursor position after the cursor is moved with the cursor movement key.

drawing control
In architecture, a control that determines how a picture is drawn for example, arc parameters, transforms, and the viewing window.

drawing layer
A map layer that contains shapes that define areas.

drawing order
In GOCA, a graphics construct that the controlling environment builds to instruct a drawing processor about what to draw and how to draw it. The order can specify, for example, that a graphics primitive be drawn, a change to drawing attributes or drawing controls be effected, or a segment be called. One or more graphics primitives can be used to draw a picture. Drawing orders can be included in a structured field.

drawing order coordinate space (DOCS)
In architecture, a two-dimensional conceptual space in which graphics primitives are drawn, using drawing orders, to create pictures.

drawing processor
In architecture, a graphics processor component that executes segments to draw a picture in a presentation space.

drawing unit
In architecture, a unit of measurement used within a graphics presentation space to specify absolute or relative positions.

draw rule
In architecture, a method used to construct a line, called a rule, between two specified presentation positions. The line that is constructed is parallel to either the inline I-axis or the baseline B-axis.

dray leg
A shipment leg that is automatically created if an LTL shipment is sent into or out of a pool point location. See also pool point.

See Distributed Replicated Block Device.

DRBD network
A static route over direct cabling between two host that are bonded.

See dynamic resource definition.

See Distributed Relational Database Architecture.

The first stage of Distributed Relational Database Architecture (DRDA). In this stage, an application or user on one system can, within a single unit of work, read update data on a single DBMS.

The second stage of Distributed Relational Database Architecture (DRDA).

DRDA access
An open method of accessing distributed data that can be used to connect to another database server to execute packages that were previously bound at the server location.

See dynamic reconfiguration data set.

drill category
The immediate descendant (child) of a root category. A drill category is used only to define the properties of a drill-down path.

drill down
In a multidimensional representation of data, to access information by starting with a general category and moving downwards through the hierarchy of information, for example from Years to Quarters to Months. See also zoom.

drill path
The navigation path through the levels of a hierarchical dimension.

drill through

  1. To view the details linked to the data in a report, cube, or macro. For example, the user can drill through a value to view the detailed sales transactions for a particular customer. Any filtering of information in the original object is automatically applied.
  2. A path used to view details linked to the data in a report, cube, or macro.
  3. A method of examination used to reveal detail or context information about a cell's contents.

drill up
In a multidimensional representation of data, to access information by navigating toward the most summarized level of data.


  1. A data storage device. A drive can be either a magnetic disk drive or a solid-state drive (SSD).
  2. The mechanism used to seek, read, and write information on a storage medium.

drive bay
A receptacle in an appliance for a hard-disk-drive module. The drive bays are in storage units that can be located in a different rack from the appliance.

drive definition
A set of attributes used to define an optical disk drive as a member of a real optical library or pseudo optical library.

drive designation
A letter (from A to Z) that an operating system assigns to a disk, a partition, or a network directory to give the system a unique way to refer to the resource.


  1. A circuit that sends small electronic signals to a device.
  2. The queue pairs at the end of the stream closest to an external interface. The principal functions of the driver are handling any associated device and transforming data and information between the external interface and the stream.
  3. See device driver.

drive through pallet rack
A pallet rack typically one pallet wide by two pallets deep by four pallets high, designed to allow a forklift truck to drive into the rack to store and retrieve two pallets deep from the same side of the rack.

driving system
The system image (hardware and software) that is used to install the target system.

driving table
A table that describes all the printer-specific information for the nroff command.


  1. See disaster recovery manager.
  2. See digital rights management.


  1. The delayed connection of a program to a routine until load time or run time.
  2. In CDE, to release the mouse button after dragging an object. If the object is dropped in an appropriate area, an action is initiated.
  3. A partition configured at the time of program execution according to the storage requirements of the application program or program to which the partition is allocated. 

Pertaining to a list or menu that opens when clicked and stays open until the user selects a menu or list item or clicks elsewhere in the user interface.

drop-in grammar
A set of precompiled grammar rules that can be used by an application-specific grammar to improve the recognition performance.

An archive within Cloud Foundry that contains an application and its runtime and framework dependencies, prior to deployment to the cloud.

Droplet Execution Agent (DEA)
The Cloud Foundry component that is responsible for deploying applications.

In QoS, the simplest form of traffic conditioning where noncompliant packets are discarded.

drop server
A file transfer server that is used for transferring deployable packages from a programming environment to the IBM Commerce on Cloud environments. The IBM UrbanCode Deploy SelfServ tool automatically checks the drop server for new or changed deployable packages and if available imports the packages into the repository for the tool where it can be later deployed into IBM Commerce on Cloud environments.

drop shadow
In graphic design, a visual effect consisting of a drawing element which looks like the shadow of an object, giving the impression that the object is raised above the objects behind it.

drop ship method
A method of product shipment used to reduce inventory costs by having the manufacturer ship an order directly to the consumer on behalf of the retailer.

drop-ship order
A type of chained order where instead of replenishing the inventory at the shipping location, the product is procured and shipped directly to the customer.

drop status
The state into which a document is moved when the events and conditions of a transaction have been completed.

See distribution resource planning.

In a drum printer, a cylinder on which the types are mounted.

drum printer

  1. A line printer in which the type are mounted on a rotating drum that contains a full character set for each printing position.(A)
  2. An impact printer in which a full character set placed on a rotating drum is made available for each printing position. (T)

dry ink
See toner.

See directory service.


  1. See data source adapter.
  2. See dynamic storage area.
  3. See Distributed Server Architecture.
  4. See digital signature algorithm.
  5. See directory system agent.

See destination subarea field.

See destination service access point.

See data source component.

See default system control area.

See data set control block.


  1. See Dedicated Server for Domino.
  2. See direct store delivery.


  1. See data switching exchange.
  2. See dependent service element.

See dummy control section.

DS engine

  1. See server engine.
  2. See InfoSphere Information Server engine.

See Digital Services Group.

See distributed shell.


  1. See dynamic system interchange.
  2. See data storage interrupt.

See digital subscriber line.

See Distributed System License Option.

See Downstream Load Utility.

See Device Support Module.

See data storage-management application-programming interface.

See data security monitor.

See default subsystem name.

See data set name.

DSNAME block
See data set name block.

See data set name block.

See distributed systems node executive.


  1. See dynamic shared object.
  2. See days sales outstanding.

See data set organization.


  1. See digital signal processing.
  2. See dynamic support program.

A piece of ILE RPG code that defines program items, such as standalone fields, named constants, and data structures with or without a subfield.

See display station pass-through.

See downstream physical unit.

See destination queue.


  1. See demand signal repository.
  2. See data set ready.
  3. See Digital Sales Rep.

See direct search list.

See distributed sync point resource manager.

See data set sequence number.

DS Storage Manager
See graphical user interface.


  1. See Daylight Saving Time.
  2. See dedicated service tools.

DST-restricted state
The status of the system before an initial program load (IPL) of the operating system is performed. Only dedicated service tools functions are allowed when the system is in the DST-restricted state.


  1. See Data Description Specifications Design Utility.
  2. See data service unit.

See data service unit/channel service unit.

See distributed software.

See document type definition.

DTD document definition
A description or layout of an XML document based on an XML DTD.

See data terminal equipment.

DTE address
An address that identifies a specific line attached to a given node on an X.25 network. DTE addresses are assigned by the network supplier.

DTE attribute
In OSI, an attribute specified by the local node to regulate connection requests with an adjacent node on an X.25 subnetwork.

DTE/DCE interface
The physical interface and link access procedures between a data terminal equipment (DTE) and a data circuit-terminating equipment (DCE).


  1. See Data Transformation Framework.
  2. See Data Transmission Facility.

See dual-tone multifrequency.

See Data Transfer Object.


  1. See distributed transaction processing.
  2. See desktop publishing.
  3. See Data Tools Platform.

See Digital Trunk Quad Adapter.

See data terminal ready.


  1. See Discoverable Taxonomy Set.
  2. See Distributed Time Service.

See detected access transmission error in.

DTS entity
In the DCE Distributed Time Service, the server or clerk software on a system.

DTSE out
See detected access transmission error out.

See directory user agent.

Pertaining to the printing of double-byte fonts in both the modern and tate presentations.

dual active
See active-active.

dual-attachment station (DAS)
A station that offers two attachments to a network, to both an upstream and a downstream neighbor, and is therefore capable of accommodating a dual ring.

dual authorization
A setting requiring that an action carried out by one person be confirmed by a second person. This prevents a single person from being able to carry out actions requiring a high level of security, for example the distribution of funds or the granting of access rights. See also single authorization.

dual copy
A high availability function that maintains two functionally identical copies of designated direct access storage device (DASD) volumes and automatically updates both copies every time a write operation is issued to the dual-copy logical volume (LVOL).

Referring to a system that integrates two processors into one virtual processor. See also core, multi-core.

dual display
The simultaneous display of a monetary amount in the shopping currency, and one or more counter value amounts in a different currency.

dual filter
A filter that identifies two endpoints from which to deny or allow traffic.

dual-homed host
See multihomed host.

dual inline memory module (DIMM)
A small circuit board with memory-integrated circuits containing signal and power pins on both sides of the board. See also single inline memory module.

dual-line call transfer

  1. A call transfer method in which the primary and secondary lines remain bridged until a call is completed.
  2. See trombone.

dual logging

  1. An optional facility that produces a duplicate copy of log data.
  2. A method of recording IBM MQ for z/OS activity, where each change is recorded on two data sets, so that if a restart is necessary and one data set is unreadable, the other can be used. See also single logging.

DUAL mode
A checkpointing mode that provides the alternate use of two primary checkpoint data sets (CKPT1 and CKPT2). The datasets are referred to as the to-be-read-from and to-be-written-to data sets.

dual mode
See dual logging.

dual problem
A mathematical programming (MP) problem which is converted from the primal MP problem and in which each feasible solution yields and bound on the optimal solution of the primal.

dual-purpose definition
For transaction routing or function shipping, a means of sharing file, terminal, or transaction definitions between systems.

dual-tone multifrequency (DTMF)
The signals sent by pressing one of the telephone keys. Each signal is composed of two different tones.

To make an MVS address space known to z/OS UNIX. See also undub.

due date
In Passport Advantage, the date on which payment is due.

due to

dummy argument
In Fortran, a variable within a subprogram or statement function definition with which actual arguments from the calling program or function reference are positionally associated. See also actual argument.

dummy control section (DSECT)
A control section that an assembler can use to format an area of storage without producing any object code.

dummy device
In the GDDM function, an imaginary output device for which the program does all the normal processing but for which no actual output is received.

dummy storage group
A type of storage group that contains the serial numbers of volumes no longer connected to a system. Dummy storage groups allow existing job control language (JCL) code to function without having to be changed.


  1. A representation of the contents of selected areas of main storage used to find out whether a program is functioning as intended and to analyze problems. Dumps may be recorded by CICS either as a consequence of failure detected during CICS execution, or upon explicit request. See also partition dump.
  2. To copy the contents of all or part of visual storage for the purpose of collecting error information.
  3. To record or copy, at a particular instant, data from one storage device onto another storage device to protect the data and debug the program.
  4. A capture of storage information at the time of an error.
  5. Data that is copied in a readable format from main or auxiliary storage to an external medium such as tape, diskette, or printer.

dump analysis and elimination (DAE)
A z/OS service that enables an installation to suppress SVC dumps and ABEND SYSUDUMP dumps that are not needed because they duplicate previously written dumps.

dump class
A set of characteristics that describes how volume dumps are managed by DFSMShsm.

dump code
In CICS Transaction Server, a predefined name by which a dump is known. There are two types of dump code, transaction dump codes and system dump codes. See also system dump code, system dump table, transaction dump code, transaction dump table.

dump copy
In DFSMShsm, a copy of the volume image produced by the DFSMSdss full-volume-dump function.

dump cycle
In DFSMShsm, the frequency, in days, with which automatic full-volume dumps are performed.

dump data
The data collected by the kernel dump program. It is obtained from memory locations used by kernel components.

dump data set
A sequential data set (optional) used to record dumps of transactions (tasks) within the system. It can be formatted and printed by the CICS dump utility program (DFHDUP). If required, the user can define two dump data sets (DFHDMPA and DFHDMPB), switching between them during online execution of CICS.

dump domain
Major component of CICS responsible for producing storage dumps and for handling the associated data sets and dump tables.

dump file

  1. A file containing data copied from main or auxiliary storage.
  2. The contents of memory without any report formatting.

dump generation
A successful full-volume dump of a volume that may contain one to five identical dump copies.

dump job facility (DJ facility)
A dynamic support program (DSP) that copies jobs to tape, or restores jobs to the system.

dump media
The diskette or the tape to which the user writes the storage dumps.

dump table
A table of dump codes to enable a user to vary the system actions taken when a dump is produced for a particular dump code.

dump table entry
A record in the master dump table that identifies the location of a component dump table. All kernel components that need to have special data collected by the dump program need to generate a dump table entry.

dump utility program (DFHDUP)
An offline utility program that formats and prints the output from formatted dump, and prints transaction dumps. It operates in batch mode and, for formatted dumps, identifies each storage area, program, and table entry, and prints them separately, with actual and relative addresses.

dump VTOC copy data set
A copy of the volume table of contents (VTOC) of a volume dumped by DFSMShsm. The dump VTOC copy data set contains only part of the data-set VTOC entry for each data set from the original data set. This data set is written on a migration-level-1 volume.

See Data Universal Numbering System.

DUNS number
See Data Universal Numbering System number.

See distributed unit of work.


  1. Pertaining to printing on both sides of a sheet of paper. See also normal duplex, tumble duplex.
  2. Pertaining to the process of writing two sets of identical records in order to create a second copy of data.
  3. In ESS Copy Services, the state of a volume pair after Peer-to-Peer Remote Copy (PPRC) has completed the copy operation and the volume pair is synchronized.
  4. Pertaining to communication in which data can be sent and received at the same time. See also half-duplex.

duplex output
Output in which both the front and back of each sheet of paper are used for printing.

duplex pair
A volume comprised of two physical devices within the same or different storage subsystems that are defined as a pair by a dual copy, Peer-to-Peer Remote Copy (PPRC) or extended remote copy (XRC) operation. A duplex pair is in neither suspended nor pending state. The operation records the same data onto each volume.

duplicate flow
Multiple instances of the same data transmission received from different flow sources.

duplicate index
An index that allows duplicate values in the indexed column.

duplicate item
An item that has the same concept as another item in the same context under the same parent, as defined in the XBRL specification.

duplicate key value
The occurrence of the same value in a key field or in a composite key in more than one record in a file.

duplicate record

  1. A record that matches a master record. The duplicate record is likely to represent the same unique entity as the master record. See also clerical record, master record, nonmatched record.
  2. A record with categories having identical non-measure values. See also consolidation.

duplicate set
A set consisting of one primary change proposal and any number of duplicates. In a duplicate set, only the primary change proposal is reviewed and applied.

After a transaction completes successfully (commits), its changes to the state survive failures. See also ACID property, ACID transaction.

Pertaining to a transaction that ensures that data is persistent, both before and after the transaction, regardless of success or failure.

durable subscription
A subscription that is retained even while the connection from a subscribing application to a messaging resource, such as a queue, a topic, or a message, is closed. See also nondurable subscription, shared subscription.


  1. In SQL, a number that represents an interval of time.
  2. A period of time during which a project element continues. It is calculated as the finish time minus the start time.
  3. The elapsed time that a job is expected to take to complete (estimated duration) and actually takes (actual duration). See also CPU time, time restriction.
  4. In Backup, Recovery, and Media Services, the length of time that the designated media is to reside at a location before moving to the next location or returning to the home location. A duration is specified in the move policy.

duration monitor
A clock-based monitor that measures the duration of transactions. The monitor runs its action when the average duration exceeds a threshold.

duration schedule
A schedule that uses a minimum duration and a maximum duration to define a processing window. Duration schedules are also used to identify what percentage of a service level criteria has been processed. See also service level criteria.

See distributed unit of work.

See digital versatile disc.

See data visibility group.

DVG criteria
See data visibility group criteria.

See Digital Video Interactive.

See dynamic VIPA.

See Decision Validation Services.


  1. See Document Verification Testing.
  2. See Distributed Voice Technologies.

A component of DVT that allocates and manages system resources in response to requests from DVT_Client2.

DVT bridge
The interface between a voice technology component (such as a speech recognizer) and the DVT server. A bridge must exist for each technology you want to integrate with DVT.

DVT interface
A DirectTalk programming interface used by a DVT bridge that enables integration of voice applications with Distributed Voice Technologies to provide functions such as speech recognition.

DVT service
The combination of a voice application, a DVT bridge, and a voice technology that allow a caller to interact with your business.

See diacritical weight.

See dense wavelength division multiplexing.

See deferred work element.

dwell time
See on-premises time.

See Data Window Services.


  1. See Domino XML.
  2. See DOORS extension language.

DXL library
A library of DXL programs that can be used to manipulate and manage Rational DOORS data. The library includes example programs and templates. User-defined DXL programs can also be stored in the DXL library.

An instance of a DynaActionForm class or subclass that stores HTML form data from a submitted client request or that stores input data from a link that a user clicked.


  1. Pertaining to an operation that occurs at the time it is needed rather than at a predetermined or fixed time. See also static.
  2. Pertaining to events that occur at run time or during processing.
  3. In programming languages, pertaining to properties that can only be established during the execution of a program; for example, the length of a variable-length data object is dynamic.

dynamic access

  1. In COBOL, an access method in which specific logical records can be obtained from or placed into a mass storage file in a nonsequential manner and obtained from a file in a sequential manner during the scope of the same OPEN statement.
  2. A process where records can be accessed sequentially or randomly, depending on the form of the input/output request.

dynamic allocation
Assignment of system resources to a program when the program is executed rather than when it is loaded into main storage. See also step allocation.

dynamically discovered server
A server that is on-boarded automatically after it starts posting events to IBM Control Center. See also dynamic discovery.

dynamically targeted
Pertaining to using a computer group to target a deployment.

dynamic analysis
The process of extracting targeted types of information based on the results of process simulations. This differs from static analysis, which extracts information from model elements in their static form.

dynamic application program
See replicated application program.

dynamic assembly
A process that selects specific endpoints to meet the conditions of a service request at run time.

dynamic attribute
A node attribute with a value that can change over time, such as node power status.

dynamic automatic reconfiguration (DARE)
Changes in the cluster configuration that can be made dynamically without stopping the cluster services. The changes take effect upon the next cluster synchronization. See also cluster configuration, reconfiguration.

dynamic automation
An automation process that oversees systems to prevent automated processes from breaking down and to try to improve them.

dynamic backout
A process that automatically cancels all activities performed by an application program that terminates abnormally. See also backout.

dynamic bind
A process by which SQL statements or XQuery expressions are bound when they are executed. See also automatic bind, static bind.

dynamic binding

  1. The act of resolving references to external variables and functions at run time. In C++, dynamic binding is supported by using virtual functions.

dynamic buffering
A user-specified option that causes the system to be responsible for acquisition, assignment, and the release of buffers.

dynamic cache
A consolidation of several caching activities, including servlets, web services, and commands into one service where these activities share configuration parameters and work together to improve performance.

dynamic cache management (DCM)
A function that automatically determines which data sets will be cached based on the system load, the characteristics of the data set, and the performance requirements defined by the storage administrator. See also DASD fast write.

dynamic calculation
The calculation of a member’s values at retrieval time instead of precalculated during batch calculation.

dynamic call
A type of call that locates a specified routine during run time. The routine is loaded into virtual storage. See also static call.

dynamic CDT
See dynamic class descriptor table.

dynamic class descriptor table (dynamic CDT)
A portion of the class descriptor table that can be created with RACF commands. See also static class descriptor table.

dynamic cluster
A server cluster that uses weights to balance the workloads of its cluster members dynamically, based on performance information collected from cluster members.

dynamic cluster isolation
The ability to specify whether the dynamic cluster runs on the same nodes as other instances of dynamic clusters, or if the dynamic cluster is the only dynamic cluster that runs on a single node.

dynamic connection

  1. A virtual private network (VPN) connection that automatically refreshes the keys that keep data secure. A dynamic connection also contains proposals that allow the key server to negotiate which parameters to use with the remote key server. See also manual connection.
  2. A connection created at the time of sign-on or using the network connection control (NCC) record sent from another node.

dynamic content
HTML content on websites, forms, landing pages or email that changes frequently and engages the reader.

dynamic content area
An area in a mailing where content can vary depending on the rules set for dynamic content.

dynamic context
The information that is available at the time that an XQuery expression is evaluated. The dynamic context consists of all of the components of the static context, plus additional components such as the context item, context position, and context size. See also expression context, static context.

dynamic cube
An in-memory multidimensional representation of a subset of a data warehouse.

dynamic cursor
A named control structure that an application program uses to change the size of the result table and the order of its rows after the cursor is opened. See also cursor, static cursor.

dynamic data
In testing, data from a data pool, variables, or data correlation. See also data correlation.

dynamic data exchange (DDE)

  1. The exchange of data between programs or between a program and a data-file object. Any change the user makes to information in one program or session is applied to the identical data created by the other program. For example, with the DDE feature enabled, the user can select the copy of a spreadsheet that is embedded in a report. If the user makes changes to the copy of the spreadsheet in the report, the changes are made to the original spreadsheet file.
  2. The process of linking two Microsoft Windows compatible applications to share data. For example, a link can be created between a Microsoft Word document and a Query file. Query updates the data in the Word document when the data in the file changes.

Dynamic Data Format (DDF)
A format used to package LOB or XML values sent by a database server, capable of holding the actual value, a reference to the value following later in the stream of data, or a token representing the value for later retrieval. See also progressive streaming.

dynamic data object (DDO)
In an application program, a generic representation of a stored object that is used to move that object in to, and out of, storage.

dynamic data stream transformation
In WebFacing, the use of a separate process to convert 5250 display data into a format compatible with web browsers.

dynamic deallocation
Freeing of system resources during program execution rather than at the end of the job.

dynamic delivery
A recommendations delivery method that enables the client to post rotating recommendations that are based in configurable parameters.

dynamic device reconfiguration (DDR)
A facility that allows a demountable volume to be moved, and repositioned if necessary, without abnormally terminating the job or repeating the initial program load procedure.

dynamic directory
See MFS dynamic directory.

dynamic discovery
The process of automatically on-boarding a server after it starts posting events to IBM Control Center. See also dynamically discovered server.

dynamic disk
A disk that provides support for volumes spanning multiple disks. Dynamic disks use a hidden database to track information about dynamic volumes on the disk and other dynamic disks.

Dynamic DNS
See Dynamic Domain Name System.

dynamic domain

  1. A domain in which the set of possible values for a type is defined. With a dynamic domain, the set of values is stored and managed outside the business object model (BOM), and changes to the set of values are automatically reflected in the business object model. When rule authors write business rules using the type, they choose from a list of values that is created dynamically and is always up-to-date.
  2. A dimension in which the set of members is constructed from data sources as rows are processed.

Dynamic Domain Name System (DDNS, Dynamic DNS)
A system that automatically updates DNS information when a new IP address is assigned to a network. It allows a domain name to stay linked to changing IP address, so users do not have to know the changed IP address in order to connect with another computer.

dynamic dump
A dump that is issued during the execution of a program, usually under the control of that program.

Dynamic Event Framework (DEF)
A mechanism for emitting and delivering events about significant system or business occurrences, as defined in a monitor model.

dynamic group
A group that is defined using a search expression.

dynamic hold
A software component that provides the ability to specify conditions for entities to be placed on hold.

Dynamic Host Configuration Protocol (DHCP)
A communications protocol that is used to centrally manage configuration information. For example, DHCP automatically assigns IP addresses to computers in a network.

dynamic infrastructure
An IT infrastructure that transforms physical and digital assets into valued services. It addresses three imperatives: improve service, reduce costs, and manage risk. It focuses on seven initiatives: service management, asset management, virtualization, energy efficiency, business resiliency, security, and information infrastructure. IBM’s strategy for a dynamic infrastructure is aligned to the Smarter Planet agenda.

dynamic IP
A method of Internet Protocol (IP) address management in which Dynamic Host Configuration Protocol (DHCP) assigns IP addresses to hosts and updates the host IP records in the Domain Name System (DNS). This method keeps DNS records current as IP address assignments change.

dynamic IP address
A temporary IP address for a transient device or logical unit on a network: for example, a personal computer. See also IP address.

dynamic IP connection
A virtual private network (VPN) connection between a local endpoint and a host with a dynamically assigned Internet Protocol (IP) address.

dynamic keyrange CDS
A multi-cluster control data set (CDS) defined without key ranges for which DFSMShsm dynamically calculates the key boundaries.

dynamic kit

  1. A group of products that are ordered as a unit and must be fulfilled together. The information about the products contained in a dynamic kit is controlled by an external configurator and supplied at order entry time. See also bundle, composite catalog entry, configurator.
  2. With Sterling Configurator dynamic kit integration, a group of SKUs that are ordered as a unit. The information about the SKUs contained in a dynamic kit is controlled by a model. The component selection is supplied by the shopper supplied at order entry time.

dynamic link
An element of a data model that represents a dynamic relationship between data items in data types. See also link.

dynamic linking

  1. The delayed connection of a program to a routine until load time or run time.
  2. Linking on demand at run time. See also static linking.
  3. The process of linking a program in which library procedures are not incorporated into the load module but are dynamically loaded from their library each time the program is loaded.

dynamic link library (DLL)
A file containing executable code and data bound to a program at load time or run time, rather than during linking. The code and data in a DLL can be shared by several applications simultaneously. See also library, shared-object file.

dynamic link pack area (dynamic LPA)
A facility for adding additional modules to the to the link pack area (LPA) after the LPA has been created. See also link pack area.

dynamic load sharing (DLS)
A distribution of traffic over available paths that permits recomputing of routes when a port or link changes status.

dynamic LPA
See dynamic link pack area.

dynamic LPAR (DLPAR)
The ability to move processors, memory, and interactive performance between logical partitions without restarting a logical partition or the server. See also application provisioning, Capacity Upgrade on Demand, free pool, logical partition, managed system.

dynamic LPDA
A function that enables a NetView application to set or query the Link Problem Determination Aid (LPDA) status for a link or station.

dynamic management statement
An SQL statement that describes, executes, and prepares other statements.

Dynamic MBean
A managed bean that implements its management interface programmatically, instead of through static method names.

dynamic member
A member of a reference structure that is defined by reference database tables.

dynamic message sign (DMS)
See variable message sign.

dynamic metric
A fact that is measured when a page is loaded or refreshed or when a report is viewed.

dynamic naming
In System Manager, the attribute of an application option that specifies whether the option can be stored in libraries and folders named at the time the installation is performed. This attribute allows an application program to be stored even if a library or folder with the same name as one of the application program's primary libraries or folders is already on the customer's system, but is used by an application program with a different registration identifier.

dynamic node

  1. A hierarchical climber that is used to send documents for approval based on the reporting structure.
  2. A VTAM node created dynamically. See also dynamic terminal.

dynamic node group
A variable node group consisting of nodes with specific attribute values.

dynamic node priority policy
A user-defined method for the cluster manager to select takeover nodes that receive a resource group. Dynamic node priority policies are based on the value of an RSCT Resource Monitoring and Control resource attribute, such as most available disk space. See also resource group policies.

dynamic operations
Operations that monitor the server environment and make recommendations that are based on the observed data.

dynamic organizational role
An organizational role that is assigned to a person by using an LDAP filter. When a user is added to the system and the LDAP filter parameters are met, the user is automatically added to the dynamic organizational role.

dynamic parse
A method of parsing TSO commands according to syntax given in an external file.

dynamic partition
A partition configured at the time of program execution according to the storage requirements of the application program or program to which the partition is allocated.

dynamic path update
The process of changing the network path for sending information without regenerating complete configuration tables.

dynamic physical kit
A physical kit that is made to order. For example, customers can order a customized configuration for a computer.

dynamic policy
A template of permissions for a particular type of resource.

dynamic print management
The use of the PrintManager program to make changes to a print operation without interrupting system functions.

dynamic priority
The priority of a process that is varied by the operating system.

dynamic processing
A method of reading from or writing to a file in a nonsequential order (see random processing) and reading from a file in a sequential order (see sequential processing) with the same OPEN statement.

dynamic product group
A collection of products with similar or related costs to which new products are automatically added or removed based on a criteria filter.

dynamic program call
A transfer of control from one program or procedure to another program (*PGM) at run time. A dynamic program call is the only way that an original program model (OPM) program can connect to another OPM program. See also static program call.

dynamic property
A property that can be overridden at run time by inserting information into the service message object (SMO).

dynamic query mode (DQM)
A Java-based query execution mode that provides native access to data sources. It optimizes queries to address query complexity and large data volumes. It provides advanced query capabilities, such as in-memory caching, that benefits query planning, execution, and results. See also compatible query mode.

dynamic queue
A local queue created when a program opens a model queue object.

dynamic random access memory (DRAM)
Storage in which the cells require repetitive application of control signals to retain stored data.

dynamic ranking
A type of ranking in which the terms in the query are analyzed with respect to the documents that are being searched to determine the rank of results. See also ranking, static ranking, text-based scoring.

dynamic reconfiguration (DR)
The process of changing the network configuration (peripheral PUs and LUs) without regenerating complete configuration tables or deactivating the affected major node. See also dynamic reconfiguration data set.

dynamic reconfiguration data set (DRDS)
In VTAM, a data set used for storing definition data that can be applied to a generated communication controller configuration at the operator's request, or can be used to accomplish dynamic reconfiguration of NCP, local SNA, and packet major nodes. A dynamic reconfiguration data set can be used to dynamically add PUs and LUs, delete PUs and LUs, and move PUs. It is activated with the VARY DRDS operator command. See also dynamic reconfiguration.

dynamic reloading
The ability to change an existing component without restarting the server for the changes to become effective. See also hot deployment.

dynamic resource allocation
An allocation technique in which the resources assigned for execution of computer programs are determined by criteria applied at the moment of need.

dynamic resource definition (DRD)
An IMS function that enables users to create, update, query, and delete the following IMS resources and their descriptors dynamically, without using the batch system definition or online change processes: application programs; databases; Fast Path routing codes; transactions.

dynamic retrieval
A storage management operation where selected data is restored back to disk. The retrieval can be either from tape to disk or from disk to disk.

dynamic route
A path that can be automatically located from a peer (locally attached) gateway.

dynamic routine-name specification
The execution of a user-defined routine whose name is determined at run time through an SPL variable in the EXECUTE PROCEDURE, EXECUTE ROUTINE, or EXECUTE FUNCTION statement.

dynamic routing

  1. A method of setting paths between hosts, networks, or both by using daemons that update the routing table as needed.
  2. The automatic routing of a service request, a message, or an event that is based on conditions at the time of the routing.
  3. A way to route HTTP requests to members of a Liberty collective without having to regenerate the WebSphere plug-in configuration file when the environment changes.

dynamic routing channel
A routing channel that allows the consumer to be identified at route time based on the mailbox path or arrived file.

dynamic routing program
A user-replaceable CICS program that selects dynamically both the system to which a routing request is to be sent and the transaction's remote name. The alternative to using this program is to make these selections when a remote transaction is defined to CICS (static routing).

dynamic routing protocol
A protocol that adjusts automatically to network topology or traffic changes.

dynamic segment
In architecture, a segment whose graphics primitives can be redrawn in different positions by dragging them from one position to the next across a picture without destroying the traversed parts of the picture.

dynamic segmentation
The ability to analyze a linear asset multiple ways without affecting its underlying geometry.

dynamic selection
See selection.

dynamic select/omit
Selection and omission of logical file records performed during processing, instead of when the access path (if any) is maintained. Dynamic select/omit may also be used when no keyed access path exists.

dynamic serialization
Copy serialization in which a file or folder is backed up or archived on the first attempt regardless of whether it changes during a backup or archive. See also shared dynamic serialization, shared static serialization, static serialization.

dynamic shared object (DSO)
A mechanism that provides a way to build a piece of program code in a special format for loading into the address space of an executable program at run time. The DSO gets knowledge of the executable program symbol set as if it had been statically linked with it in the first place.

dynamic slotting
A method of dedicating locations to SKUs where the system automatically determines an available active area location and slots the location to a SKU.

dynamic sparing
The ability of a storage server to move data from a failing disk drive module (DDM) to a spare DDM while maintaining storage functions.

dynamic SQL
An SQL statement that is prepared and executed at run time. In dynamic SQL, the SQL statement is contained as a character string in a host variable and is not precompiled. See also deferred embedded SQL, incremental bind statement, static SQL.

dynamic storage
An area of storage that is explicitly allocated by a program or procedure while it is running. See also automatic storage, static storage.

dynamic storage area (DSA)
A type of storage allocation in which storage is assigned to a program or application at run time.

dynamic store group
A set of stores that are treated as one unit to which stores are added or removed automatically based on criteria filter.

dynamic string
See string.

dynamic summarization
A type of summarization in which the search terms are highlighted and the search results contain phrases that best represent the concepts of the document that the user is searching for. See also static summarization, summarization.

dynamic support program (DSP)
Multiprogrammed system components that are scheduled by the job segment scheduler (JSS) and implement a specified function. A DSP can be related to job execution, such as main service or output service, or it can be a background utility, such as the dump job facility.

dynamic switched definition
In VTAM, the representation of a switched device that is not previously defined to VTAM.

dynamic system interchange (DSI)
A recovery facility that allows the operator to switch the JES3 global functions to a local processor in case of global processor failure.

dynamic table
An installation-defined table that is used to extend, modify, or delete the default processing specifications. See also table pair.

dynamic terminal
A terminal created through the Extended Terminal Option (ETO). This is a terminal that has not been defined within the IMS system definition, and for which no control blocks exist at IMS initialization time. See also dynamic node, static terminal.

dynamic threshold alteration
The process that enables a network operator to dynamically change the traffic count and temporary error threshold values associated with SDLC and BSC devices in communication controllers and network controllers.

dynamic threshold query
The process that enables a network operator to query the current settings of a traffic count or temporary error threshold value associated with an SDLC or BSC device in a communication controller or network controller.

dynamic transaction routing program (DFHDYP)
A user-replaceable CICS program that selects dynamically both the system to which a transaction routing request is to be sent and the transaction's remote name. The alternative to using this program is to make these selections when a remote transaction is defined to CICS (static transaction routing).

dynamic user
A user signed on to a dynamic node and for whom a Subpool Queue Block (SPQB) was dynamically created.

dynamic variable
A variable allocated only when needed. Explicit allocations and deallocations are required. In Pascal, the predefined procedures NEW and DISPOSE are provided for this purpose.

dynamic view
A view that uses a network file system to access versions of elements.

dynamic VIPA (DVIPA)
A function that allows the system to move IP addresses in event of an application, TCP/IP stack, or LPAR failure.

dynamic vocabulary
A vocabulary that is defined while an application is running.

dynamic VPN
A virtual private network that requires a separate server to support the exchange of the keys that are used to encrypt data at each end point.

dynamic web content
Programming elements such as JavaServer Pages (JSP) files, servlets, and scripts that require client or server-side processing for accurate runtime rendering in a web browser.

dynamic web project
A project that contains resources for a web application with dynamic content such as servlets or JavaServer Pages (JSP) files. The structure of a dynamic web project reflects the Java EE standard for web content, classes, class paths, the deployment descriptor, and so on.

dynamic window
A variable that can change dynamically within a certain window or range of values.

Dynamic Workload Console
A web-based graphical user interface used to create, modify, and maintain job scheduling objects, to manage the production environment, and to produce reports.

dynamic workload manager
A feature of the on demand router that routes workload based on a weight system, which establishes a prioritized routing system. The dynamic workload manager dynamically modifies the weights to stay current with the business goals.

dynamic writer
An output service function that controls printing or punching of data sets with characteristics that are not assigned to a specific device but are assigned to appropriate devices as they become available.

dynamic XCF link
A link that uses the cross-system coupling facility that can be automatically generated any time TCP/IP becomes active within a sysplex.