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

Q


Q.921
The ITU-T (formerly CCITT) recommendation that defines the link layer of the DSS1 protocol. Q.921 defines an HDLC protocol that ensures a reliable connection between the network and the user. Often used synonymously with LAPD.

Q.931
An ITU recommendation that defines the network layer protocol for integrated services digital network (ISDN). This layer carries the ISDN messages that control the establishment and clearing of calls.

Q.932
The CCITT Recommendation that defines the generic procedures applicable for the control of supplementary services at the user-network interface. These procedures expand on the basic call-control functions defined in Q.931. See also supplementary service.

q_data
See qualifying data.

Q Apply latency
In Q replication, an approximate measurement of the difference between the time that the Q Apply program gets changed data from the receive queue and the time that the data is applied to a target table. This measurement is a subset of the end-to-end latency in a replication scenario. See also Apply latency, Capture latency, end-to-end latency, latency, Q Capture latency, queue latency.

Q Apply program
In Q replication, a program that reads transactions from a receive queue and applies those changes to one or more target tables or passes the changes to a procedure.

Q Apply schema
In Q replication, the identifier for a Q Apply program and its control tables.

Q Apply server
In Q replication, a database or subsystem on which the control tables for the Q Apply program are located and where the Q Apply program runs. It contains one or more sets of the control tables that store information about target tables and other replication definitions.

QBE
See query by example.

Q-bit
See qualifier bit.

Qbuffer
See queue buffer.

QC
See quality control.

Q Capture latency
In Q replication, an approximate measurement of how current a Q Capture program is in reading the DB2 database recovery log. This measurement is the approximate difference between the time that source data was changed and the time that the Capture program made the data available by committing it to WebSphere MQ. This measurement is a subset of the end-to-end latency in a replication scenario. See also Apply latency, Capture latency, end-to-end latency, latency, Q Apply latency, queue latency.

Q Capture program
In Q replication and event publishing, a program that reads the DB2 database recovery log to capture changes made to DB2 database source tables and transmits the changes by using one or more WebSphere MQ queues. See also Capture program, event publishing, Q replication.

Q Capture schema
In Q replication, the identifier for a Q Capture program and its control tables.

Q Capture server
In Q replication and event publishing, a database or subsystem on which the control tables for the Q Capture program are located and where the Q Capture program runs. The Q Capture server contains one or more sets of the control tables that store information about Q subscriptions, publications, and other replication or publishing objects. See also control server.

Q Capture transaction latency
In Q replication, the time between when a Q Capture program reads the commit statement for a transaction in the DB2 database recovery log and when the Q Capture program puts the message that contains the transaction on a send queue.

QCMD
The IBM-supplied control language processor that interprets and processes CL commands for the system.

QCP dialog
See query current plan dialog.

qdaemon
A process that maintains a list of outstanding jobs and sends them to the specified device at the appropriate time.

QDIO
See queued direct I/O.

QEMU
An open source emulator for complete PC systems. In addition to emulating a processor, QEMU permits emulation of all necessary subsystems, such as networking and video hardware, as well as advanced concepts.

QGPL
See general purpose library.

QHST
A message destination that is an alternative to the job log.

QID Map
A taxonomy that identifies each unique event and maps the events to low-level and high-level categories to determine how an event should be correlated and organized.

QLLC
See Qualified Logical Link Control.

QM
See quality management.

QMF
See Query Management Facility.

QMF administrative authority
Authorization for a user to insert or delete rows in a profiles table. Users with this authority can use commands on QMF queries, forms, and procedures that are owned by other users without forcing the owners to share these objects with all users.

QMF administrator
A user who possesses QMF administrator authority.

QMF object
An object used by QMF users to query, format, and present data or otherwise manage interaction between QMF and the database. QMF objects include queries and query result data, forms, procedures, reports, charts, and the QMF profile.

QMGR
See Queue Manager.

Qname
See queue name.

QName
See qualified name.

QNX
A closed source mobile operating system based on a microkernel architecture model. QNX was acquired by Research in Motion and became their primary tablet operating system until the introduction of BBX. See also BlackBerry OS, mobile operating system.

QoS
See quality of service.

QoS policy
A set of actions that a network takes to configure and signal for a particular quality of service (QoS) service to be provided to a particular traffic classification.

QP
See quadratic programming.

QPS
See qualified Parallel Sysplex.

QR code
See Quick Response code.

Q replication
A replication solution that uses WebSphere MQ message queues for high-volume, low-latency replication. See also high availability disaster recovery, Q Capture program, SQL replication.

QS
See quality status.

QSAM
See queued sequential access method.

Qshell Interpreter
A standard command interface that is used to run standard commands, such as UNIX-like commands and Java commands, and then view the output.

QSN
See queue sequence number.

QSRV
The IBM-supplied user profile for a service representative.

Q subscription
In Q replication, an object that identifies a mapping between a source table and target table or procedure and specifies what changes are replicated. See also publication, replication source, subscription.

QSYS

  1. The library shipped with the system that contains objects, such as authorization lists and device descriptions created by a user, and the system commands and other system objects required to run the system. The system identifier is QSYS.
  2. The IBM-supplied user profile that owns most IBM-supplied objects.

quadratic
Pertaining to a function that can be represented by an equation in N variables where the variables are only first or second degree (that is, one variable may be multiplied by another variable, and any of the variables may be squared) and where the coefficients of the variables are constant numeric values (that is, integers or floating-point numbers).

quadratic programming (QP)
A technique for solving an optimization problem for which the model contains a quadratic objective.

quadtree
A structure that is composed of four quadrants which recursively subdivide themselves by four, to achieve manageable data sets. This permits quick access to information, as the quadtree can confine its search to quadrants covering a particular area of interest.

quadword
A contiguous sequence of bits or characters that comprises of four computer words and can be addressed as a unit.

qualified call
A DL/I call that contains at least one segment search argument.

qualified class name
Any class name or class name qualified with one or more :: (scope) operators.

qualified data-name
In COBOL, an identifier that is composed of a data-name followed by one or more sets of either of the connectives OF or IN followed by a data-name qualifier.

qualified job name
A job name and its associated user name and a system-assigned job number. See also job name.

Qualified Logical Link Control (QLLC)
An X.25 protocol that allows the transfer of data link control information between two adjoining SNA nodes that are connected through an X.25 packet-switching data network. The QLLC provides the qualifier Q bit in X.25 data packets to identify packets that carry logical link protocol information. See also enhanced logical link control, physical services header.

qualified name (QName)

  1. A name that conforms to the Namespaces in XML specification. A QName consists of an optional prefix, or its associated URI, and a local name. See also expanded QName, in-scope namespace.
  2. The name of the library containing the object and the name of the object. See also object name.
  3. In C++, a name that is used to qualify a nonclass type name, such as a member, by its class name.
  4. A name made unique by the addition of one or more qualifiers.
  5. A data name explicitly accompanied by a specification of the class to which it belongs in a specified classification system.
  6. A data set name consisting of a string of names separated by periods; for example, TREE.FRUIT.APPLE is a qualified name.

qualified Parallel Sysplex (QPS)
A Parallel Sysplex that complies with licensing criteria to qualify for software pricing benefits through Parallel Sysplex aggregation.

qualified segment search argument
A segment search argument (SSA) that contains, in addition to the segment name, one or more qualification statements. A qualified SSA describes the segment type and occurrence that is to be accessed. See also segment search argument.

qualified type name
A name used to reduce complex class name syntax by using typedefs to represent qualified class names.

qualifier

  1. A value that provides additional information about a class, association, indication, method, method parameter, instance, property, or reference.
  2. A modifier that makes a name unique.
  3. A simple element that gives another generic compound or simple element a specific meaning. Qualifiers are used in mapping single or multiple occurrences. A qualifier can also be used to denote the namespace used to interpret the second part of the name, typically referred to as the ID.
  4. A term or phrase that is added to the end of a personal name to distinguish that name by specifying a generational standing (such as Junior or Senior, or "fils" in French for Junior), an achievement academic or religious rank that the person has attained (for example, Ph.D.), or a professional qualification of some kind (for example, D.D.S.). For name-matching purposes, a qualifier is considered a peripheral or minor part of a personal name. See also honorific, title, affix, and qualifier.
  5. When referring to a QMF object, the part of the name that identifies the owner or the location of an object. When referring to a TSO data set, any part of the name that is separated from the rest of the name by periods. For example, 'TCK', 'XYZ', and 'QUERY' are all qualifiers in the data set name 'TCK.XYZ.QUERY'.
  6. In data processing, all names in a qualified name other than the name to the far right, which is called the simple name.
  7. Each component name in a qualified name other than the right-most name. For example, TREE and FRUIT are qualifiers in TREE.FRUIT.APPLE.

qualifier bit (Q-bit)
In X.25 communications, the bit in a data packet that can be set by the sending DTE to qualify the user data in some way that is meaningful to the receiving DTE.

qualifier key
A key on a keyboard the operation of which has no immediate effect, but which, for as long as it is actuated, modifies the effect of other keys. A qualifier key may be, for example, a level select key or a control key (see ISO/IEC 9995-1).

qualifying data (q_data)
Unique information associated through a condition token with a given instance of a condition. A user-written condition handler uses q_data to identify and react to the condition.

quality control (QC)
The process of inspecting incoming materials to verify correct SKUs, quantities, packaging requirements, and so on, as well as the quality of the material. Quality control is generally accomplished on a sampling basis in which a specified percentage of a receipt is inspected.

quality management (QM)
A systematic approach to build quality into a solution and assess the quality of deliverables and processes throughout a project lifecycle.

quality of service (QoS)

  1. A measure of system performance and system availability.
  2. For an asynchronous transfer mode (ATM) virtual channel or a Networking BroadBand Services (NBBS) network connection, a set of communication characteristics such as end-to-end delay, jitter, and packet loss ratio.
  3. A set of communication characteristics that an application requires. Quality of service (QoS) defines a specific transmission priority, level of route reliability, and security level.
  4. Any operation that allows traffic priorities to be designated. Through quality of service, different traffic throughout a network can be classified and administered.
  5. In OSI, a value that specifies certain performance characteristics of a service, session, or link. In OSI Communications Subsystem, quality of service is provided at the network layer.

Quality of Service policy
A policy that collects performance data for HTTP transactions for one or more web servers, including the entire round-trip time of the transaction, the back-end service time, and the page display time.

quality status (QS)
A user-defined code that identifies the condition of a SKU or group of SKUs; for example, "new product", "factory defects", or "seconds."

quality tier
A range that defines the price of an item for a quality range. If the quality ordered for that item falls within this range, the price defined by the quality tier applies to the item in the order.

quantified predicate
A predicate that compares a value with a set of values.

quantile
A subgroup that is created when a group is divided into equal, ordered parts. See also decile, quartile, quintile, vingtile.

quantity tier
A range that defines the price of an item for a quantity range. If the quantity ordered for that item falls within this range, the price defined by the quantity tier applies to the item in the order.

quantization
The subdivision of the range of values of a variable into a finite number of nonoverlapping, but not necessarily equal intervals. Each interval is represented by an assigned value.

quantum
A subrange in quantization.

quarantine rule
A set of responses that block DDoS attacks, prevent worms from spreading, and deny access to systems that are infected with backdoors or Trojan horses.

quartile
A division of data into four ordered groups of equal size. See also decile, quantile, quintile, vingtile.

quartile analysis
A type of analysis that displays the value of the business measures boundaries at the 25th, 50th, or 75th percentiles of a frequency distribution divided into four parts, each containing a quarter of the population.

quarto-size paper
Paper that is 216 mm by 275 mm (8.5 in. by 10.83 in.).

quasi-reentrant
Pertaining to CICS application programs that run under the CICS quasi-reentrant task control block (QR TCB). See also reenterable.

query

  1. The simple report specifications created and edited by Query Studio.
  2. In a Tivoli environment, a combination of statements that are used to search the configuration repository for systems that meet certain criteria. The query object is created within a query library.
  3. A method for filtering and sorting requirements in views by limiting either the values of one or more attributes or traceability and specifying the order in which to display the filtered requirements. See also sorting.
  4. A specification for a set of data retrieved from a data source.
  5. In interactive systems, an operation at a workstation that elicits a response from the system.
  6. In data communications, the process by which a master station asks a slave station to identify itself and to give its status.
  7. A component of certain SQL or XQuery statements that specifies a result set.
  8. A statement, or combination of statements, that is used to search a rule project (or other scope) and to select rule project elements that meet certain criteria.
  9. A way of retrieving information from the lifecycle index of artifacts, such as products, work items, requirements, design models, and test cases. The resulting list of artifacts can be used to populate a view, run a report, perform an analysis, and more.
  10. A reusable request for information about one or more model elements
  11. A request for information from a database that is based on specific conditions: for example, a request for a list of all customers in a customer table whose balances are greater than USD1000.

query block
The part of a query that is represented by one of the FROM clauses. Each FROM clause can have multiple query blocks, depending on how DB2 for z/OS processes the query.

query body
The part of a query that contains the XQuery expression. See also query prolog.

query by example (QBE)
A query that is specified by entering sample data in the appropriate fields.

query capability
A base URI for forming query resource URIs.

query command
The name of an action, and any associated parameters, that can be performed by DB2 for i5/OS query management. The query commands include ERASE, EXIT, EXPORT, GET, IMPORT, PRINT, RUN, SAVE, SET, and START.

query command procedure
In DB2 for i5/OS query management, a type of query procedure that contains a subset of the query commands allowed in a query procedure. The query command procedure can be used for initializing global variables.

query CP parallelism
Parallel execution of a single query, which is accomplished by using multiple tasks. See also sysplex query parallelism.

query current plan dialog (QCP dialog)
A dialog that displays information taken directly from the current plan. The information includes information on operations, workstations, and application occurrences.

query definition
In Query for i5/OS, information about a query that is stored in the system. The system-recognized identifier for the object type is *QRYDFN.

query expansion
A supplement to the user's search string to improve search retrieval results. A search string such as "phone" may be expanded to "phone, phones, telephone, telephones, mobile phone, cellular phone".

Query for i5/OS
The IBM licensed program used to select, format, and analyze information from data files to produce reports and other files.

query instance
In DB2 for i5/OS query management, a collection of system resources and a set of query commands within an application program.

query I/O parallelism
Parallel access of data, which is accomplished by triggering multiple I/O requests within a single query.

query item
A representation of a column of data in a data source. Query items may appear in a model or in a report and contain a reference to a database column, a reference to another query item, or a calculation.

query management
A function of DB2 for i5/OS that provides query and report writing by using Structured Query Language (SQL).

Query Management Facility (QMF)
An IBM query and report writing facility that supports a variety of tasks such as data entry, query building, administration, and report analysis.

query management object
In DB2 for i5/OS query management, a collective term to describe any of the query management objects: query, form, or procedure.

Query Manager
See DB2 Query Manager.

query mode
In DB2 for i5/OS query management, the processing mode associated with a query instance.

query optimization class
A set of query rewrite rules and optimization techniques for compiling queries.

query optimization information statement
An SQL statement that is used to optimize the performance of queries. These statements include SET EXPLAIN, SET OPTIMIZATION, and UPDATE STATISTICS.

query optimizer

  1. Software that turns individual SQL statements into a set of structures that enable fast and efficient data retrieval from the iSeries (AS/400).
  2. A component of the SQL and XQuery compiler that chooses an access plan for a data manipulation language statement by modeling the execution cost of many alternative access plans and choosing the one with the minimal estimated cost. See also compensation, data distribution, optimizer hint.

query prolog
In DB2 XQuery, a series of declarations that defines the processing environment for a query. See also query body.

query reference data
Information, including result data, that is returned by a query to an Excel or 1-2-3 workbook. Examples include column headings, variables, and the SELECT statement used to execute the query.

query statement
See query.

query string

  1. A character string that specifies the properties and property values for a query. You can create the query string in an application and pass it to the query.
  2. An input parameter that specifies the statistical data to be retrieved.

query subject
A named collection of query items that are closely functionally related. Query subjects are defined using Framework Manager to represent relational data and form the set of available data for authoring reports in Query Studio and Report Studio. A query subject is similar to a relational view in that it can be treated as a table but does not necessarily reflect the data storage.

query timeout
A workload management control that specifies the time that a query that is executed by a user in the group can run before the system aborts the query.

query variable
A variable that is used to filter data source queries.

query window
A window that specifies a set of rows used in calculations with respect to the current row under examination. The calculation may be for computing a moving set function, a join, or expiring rows from a view.

QUEST
See Quick, Unbiased, Efficient Statistical Tree algorithm.

questionnaire definition
A description of a project in terms of the texts of the questions and their order, layout, and routing.

question pool

  1. A set of questions that a Virtual Classroom instructor develops when creating a course that he or she plans to ask at some point during a session. For example, during a session an instructor might want to ask questions to get a sense of whether the students are understanding the course materials.
  2. A feature that stores and manages all questions and chapters.

queue

  1. A mechanism for monitoring sample records as they move through the system. Each queue is a collection of respondents with a specific status code. For example, the Fresh queue might contain sample records that have not been used yet, and the Active queue might contain sample records whose interviews are in progress.
  2. An object that holds messages for message-queueing applications. A queue is owned and maintained by a queue manager.
  3. A line or list of items waiting to be processed, for example, work to be performed or messages to be displayed or transmitted.
  4. A workflow database table that holds work items. See also component queue, system queue, user queue, work queue.
  5. A data structure for processing work in which the first element added to the queue is the first element processed. This order is referred to as first-in first-out (FIFO).
  6. A destination for point-to-point messaging.
  7. To form or arrange as a list or line.

queue buffer (Qbuffer)
An IMS queue manager incore buffer that is used to keep the working copy of an IMS message segment.

queued BIND
In VTAM, a BIND request that is sent from the primary logical unit (PLU) to the secondary logical unit (SLU), to which the SLU has not yet responded.

queued call
A telephone call that has been placed on hold and is waiting in the queue of telephone calls to be serviced by a system resource (such as an ACD group).

queued CINIT
In VTAM, a CINIT request that is sent from a system services control point (SSCP) to a logical unit (LU), to which the LU has not yet responded.

queued direct I/O (QDIO)
A hardware channel architecture for direct data exchange with I/O devices, where both the I/O device and the program running on the server reference main storage directly through a set of data queues. The QDIO architecture is used by Open Systems Adapter-Express (OSA-Express), HiperSockets, and Fiber Channel Protocol (FCP) channels.

queue depth

  1. The number of input/output (I/O) operations that can be run in parallel on a device.
  2. In SNADS, the number of distribution items on the distribution queue waiting to be sent.

queue destination
A service integration bus destination that is used for point-to-point messaging.

queue device
A logical device defining characteristics of a physical device attached to a queue.

queued sequential access method (QSAM)
An access method for storing and retrieving logical records in a continuous sequence. Input data blocks awaiting processing or output data blocks awaiting transfer to auxiliary storage are queued on the system to minimize delays in I/O operations.

queued session
In VTAM, a requested LU-LU session that cannot be started because one of the logical units (LUs) is not available. If the session-initiation request specifies queuing, the system services control points (SSCPs) record the request and later continue with the session-establishment procedure when both LUs become available.

queue element

  1. A block of data or an item in a queue.
  2. A message and its related control information stored in a data record in the MERVA ESA Queue Data Set.

queue index
In WebSphere MQ for z/OS, a list of message identifiers or a list of correlation identifiers that can be used to increase the speed of MQGET operations on the queue.

queue latency
In Q replication and event publishing, an approximate measurement of the difference between the time that the Q Capture program commits data to WebSphere MQ and the time that WebSphere MQ makes the data available to the Q Apply program or a receiving application. Queue latency is a subset of the end-to-end latency in a replication scenario or an event publishing scenario. See also end-to-end latency, Q Apply latency, Q Capture latency.

queue management

  1. The process of setting up user alert queues for specific users or types of exceptions and for determining the type of user notification.
  2. A MERVA service function that handles the storing of messages in, and the retrieval of messages from, the queues of message-processing functions.

Queue Manager (QMGR)

  1. An IMS component that manages IMS messages and the space the messages occupy. The IMS Queue Manager is part of a DB/DC or DCCTL environment.
  2. A component of CICSPlex SM that creates and manages queues of data in a cache that is shared by a CMAS and its local MASs.

queue manager

  1. A Java virtual machine (JVM) service that sends and receives documents outside of the product.
  2. A component of a message queuing system that provides queuing services to applications. See also channel, multi-instance queue manager.

queue manager event
An event that indicates that an error condition has occurred in relation to the resources used by a queue manager (for example, a queue is unavailable), or a significant change has occurred in the queue manager (for example, a queue manager has stopped or started).

queue manager group
In a client channel definition table (CCDT), the group of queue managers a client tries to connect to when a connection is established to a server.

queue manager level security
In WebSphere MQ for z/OS, the authorization checks that are performed using RACF profiles specific to a queue manager.

queue manager set
A grouping of queue managers in WebSphere MQ Explorer that allows a user to perform actions on all of the queue managers in the group.

queue map
In Q replication and event publishing, an object that contains the settings for how Q replication and event publishing programs process transactions and identifies the WebSphere MQ queues that are used in a replication or event publishing scenario. See also publishing queue map, replication queue map.

queue name (Qname)
The name of a queue on Shared Queues upon which data objects reside. The queue name is 16 bytes long, left justified, padded with blanks. The first byte of the client queue name is the queue type. A client queue name of blanks or zeroes is supported.

queue sequence number (QSN)
A sequence number that is assigned to the messages stored in a logical queue by MERVA ESA queue management in ascending order. The QSN is always unique in a queue. It is reset to zero when the queue data set is formatted, or when a queue management restart is carried out and the queue is empty.

queue-sharing group
In WebSphere MQ for z/OS, a group of queue managers in the same sysplex that can access a single set of object definitions stored in the shared repository, and a single set of shared queues stored in the coupling facility. See also shared queue.

queue-sharing group level security
In WebSphere MQ for z/OS, the authorization checks that are performed using RACF profiles that are shared by all queue managers in a queue-sharing group.

queue stanza
A stanza that defines a queue for one or more devices to which jobs can be queued.

queue structure
A structure managed by CQS that contains data in queues.

queue type
A grouping of shared queues on the coupling facility list structure whose meaning is client defined or CQS defined.

queuing network
A group of interconnected components.

Quick, Unbiased, Efficient Statistical Tree algorithm (QUEST)
A decision tree algorithm that provides a binary classification method for building the tree. The algorithm is designed to reduce the processing time required for large C & R tree analyses while also reducing the tendency found in classification tree methods to favor inputs that allow more splits. See also classification and regression tree algorithm, decision tree algorithm.

quick access
The method to obtain information about an order, item, or customer using the shortest process.

quick closedown
In VTAM, a closedown in which any RPL-based communication macroinstruction is terminated (posted complete with an error code), no new sessions can be established, and no new access method control blocks (ACBs) can be opened. See also cancel closedown, orderly closedown.

quick-help
The information that is shown in the prompt line as a user holds down the mouse button and moves the cursor over a button. Quick-help can be user-defined.

quick link
An association between a Uniform Resource Identifier (URI) and keywords or phrases.

quick publish
To copy managed assets from a task group to the production server after the commit of the managed assets from the task group to the production-ready data on the authoring server is successful. See also authoring server, commit, managed asset, production server, production-ready data, task group, workspace.

quick query
A query that is run using only a file name and possibly some record selection specifications; an undefined query.

quick registration
An easy way to register a supplier without requiring participation on the supplier’s side. The purchaser registers a supplier.

Quick Response code (QR code)
A commonly used matrix code for tagging. For example, BlackBerry devices use QR codes as an option to transmit contact information between BlackBerry users. See also matrix code, tag, tagging.

quick start
A type of warm start that can be performed in a multi-access spool (MAS) configuration.

QuickStep pad
A window containing a variable number of buttons that can be clicked on with a mouse. Each button can be assigned a macroinstruction that issues a predefined sequence of keystrokes or commands.

quiesce

  1. To pause or alter the state of running processes on a computer, particularly those processes that might modify information stored on a disk during backing up, in order to guarantee a consistent and usable backup.
  2. To end a process or shut down a system after allowing normal completion of active operations.

quiesced
Pertaining to the state of an instance or database when it has no active transactions, the buffer pools are flushed, no new transactions are allowed, and no new connections are allowed.

quiesced journal backup
A method of journal backup during which all DFSMShsm activity is quiesced while DFSMShsm complete backup of the journal. See also non-intrusive journal backup.

quiesced shutdown

  1. In WebSphere MQ, a shutdown of a queue manager that allows all connected applications to disconnect. See also immediate shutdown, preemptive shutdown.
  2. A type of shutdown of the CICS adapter where the adapter disconnects from WebSphere MQ, but only after all the currently active tasks have been completed. See also forced shutdown.

quiesce point
A point at which data is consistent as a result of running the DB2 QUIESCE utility.

quiesce protocol
In VTAM, a method of communicating in one direction at a time. Either the primary logical unit (PLU) or the secondary logical unit (SLU) assumes the exclusive right to send normal-flow requests, and the other node does not send such requests. When the sender wants to receive, it releases the other node from its quiesced state.

quiesce time
A time of day after which an automatic function does not start processing any more volumes.

quiescing

  1. The process of bringing a device or a system to a halt by rejection of new requests for work.
  2. In WebSphere MQ, the state of a queue manager before it stops. In this state, programs are allowed to finish processing, but no new programs are allowed to start.

quiet system
A system on which no processes are running other than the process whose performance is being timed, and from which all communications devices have been disconnected.

quiet zone
See clear area.

quintile
A division of data into five ordered groups of equal size. See also decile, quantile, quartile, vingtile.

quorum

  1. An LVM facility that determines whether a volume group can be placed online or whether it can remain online after a failure of one or more of the physical volumes in the volume group. With a volume group, quorum is achieved when more than half of the volume group descriptor areas (VGDAs) and volume group status areas (VGSAs) are accessible and identical in content.
  2. The number of members in a cluster, domain, or group that is required to perform some operation, such as changing a configuration or performing a transaction. See also tie.

quorum disk

  1. The disk accessed exclusively by Microsoft Cluster Server to store the cluster recovery log, and to determine whether a server is up or down. Only one server can own the quorum disk at a time. Servers in the cluster can negotiate for the ownership.
  2. A disk that contains a reserved area that is used exclusively for system management. The quorum disk is accessed when it is necessary to determine which half of the clustered system continues to read and write data. Quorum disks can either be MDisks or drives.

quorum index
The pointer that indicates the order used to resolve a tie. Nodes attempt to lock the first quorum disk (index 0), followed by the next disk (index 1), and finally the last disk (index 2). The tie is broken by the node that locks them first.

quorum node
A node in the cluster that is counted to determine whether a quorum exists.

quota

  1. A requirement for the sample in terms of the numbers of respondents that have certain characteristics or combinations of characteristics such as age, gender, socioeconomic class, type of car owned, and so on.
  2. The amount of disk space and number of files and directories assigned as upper limits for a specified user, group of users, or file set.
  3. A monetary target for revenue, profit, and signings that is assigned to a sales or services employee, business unit, or geography.
  4. For HSM on Windows systems, a user-defined limit to the space that is occupied by recalled files.
  5. For HSM on AIX, UNIX, or Linux systems, the limit (in megabytes) on the amount of data that can be migrated and premigrated from a file system to server storage.
  6. A size limitation, such as the limit on the amount of disk space or size of a file set.

quota management
The allocation of disk blocks to the other nodes writing to the file system, and comparison of the allocated space to quota limits at regular intervals.

quotation mark
The characters " and '.

quote

  1. To mask the special meaning of certain characters, causing the characters to be taken literally.
  2. A legally binding agreement between a seller and a buyer for the purchase of a predetermined set of items and the quantities of these items at a predetermined price, with delivery on a specified date. A quote may either result in a single order, or it may expire on a specified date if an order is not placed.

quoted literal
A constant that is expressed as itself rather than as a result of an expression, such as an arithmetic formula.

quoted name
See delimited identifier.

quote event
A screen where users can change the status of an event.

quote line
All of the line items that are associated with a particular quote.

quote price
A price that is presented to the customer for all the products included in a quote.

QWERTY keyboard
A keyboard in which the keys in the second-from-top row (row D) are labeled (from left to right): Q, W, E, R, T and Y. Such keyboards are commonly used in English-speaking countries. See also AZERTY keyboard.