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.


In data communications, a specification of the CCITT that defines the list of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE).

In data communications, a specification of the CCITT that defines the automatic answering equipment or parallel automatic calling equipment or both on the General Switched Telephone Network, including procedures for disabling of echo controlled devices for both manually and automatically established calls.

V.25 bis
In data communications, an interim specification of the CCITT that defines the connection of data terminal equipment to a serial-dial interface of a public switched telephone network.

In data communications, a specification of the CCITT that defines the list of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) at data rates of 48 kilobits per second.

See variance at completion.

See value added distributor.


  1. In linking and traceability, pertaining to a manually set status when two artifacts satisfy the meaning of the link between them. See also invalid, suspect, validity summary.
  2. Pertaining to that which is allowed, is true, or conforms to some standard.

To check a policy set for conditions that can cause problems if that policy set becomes the active policy set. For example, the validation process checks whether the policy set contains a default management class.

validating node
A network node that is responsible for running consensus, validating transactions and maintaining the ledger.

validating peer
See validating node.


  1. In Sterling Order Management, a business scenario. A business user defines and manages business detection and override rules against a validation.
  2. The process of verifying that a certain test succeeded or failed to achieve its goal.
  3. An optional final stage of model building in which the refined model from the testing stage is validated against a further subset of the source data. See also model building, testing, training.
  4. The checking of data or code for correctness or for compliance with applicable standards, rules, and conventions.
  5. The process of comparing an entity against the specified requirements to determine if it meets each and every requirement.

validation action
A mechanism for verifying whether the actual value of a variable at run time corresponds to the expected value of that variable. See also timing constraint.

validation data
In Cryptographic Support, information about a customer used to create and verify the customer's personal identification number (PIN).

validation domain
The logical grouping of validations based on the functionality of the use case that the validation represents; for example, order and pricing.

validation list
An i5/OS object that can store an identifier, encrypted data, and free-form data. This type of object is often used to store user ID and password information about remote users. The system-defined object type is *VLDL.

validation reference
In Sterling Order Management, a reference value that uniquely identifies an instance of a rule violation during a transaction.

validation rule

  1. A rule defined on an attribute definition that specifies the criteria that must be met by the data stored in an instance of this attribute for that attribute to be valid. See also attribute definition, attribute instance.
  2. In Sterling Order Management, a business detection rule or limiting condition that is established to address a common business scenario. For example, one could place a limit of 10 on a sale item, or limit the age of a purchaser to 18 years or older. As long as a transaction is within the limits of the validation rule, it proceeds without intervention.

A program that checks data or code for correctness or for compliance with applicable standards, rules, and conventions.

valid end type
An entity type that conforms to the end constraints of a particular link. See also end constraint.

valid entry
An entry by an operator that falls on or within the range of valid values that are configured during survey authoring. A valid entry enables the system to proceed to the next available variable or question for entry.


  1. A data analysis process that evaluates columns for valid and invalid values.
  2. In linking and traceability, an assessment of whether two artifacts satisfy the meaning of the link between them. See also validity summary.

validity check
A check to determine if a code group is actually a character of the particular code in use.

validity checking

  1. Verification that object names used in DB2 for i5/OS SQL statements exist on a system.
  2. Verification of the contents of a field.

validity period
The time interval defined by an origin date and an end date within which a run cycle or an application description is valid.

validity summary
In linking and traceability, an aggregate assessment of whether links for an artifact are valid. See also invalid, suspect, valid, validity.

valid printable area (VPA)
The intersection of the current logical page or current overlay with the physical page in which printing is allowed. See also physical printable area, user printable area.

Valuation for Customs Purposes
The actual price paid or payable for goods plus specific additions. This value should be the price shown on an invoice, plus any additional value that is not part of the price paid.


  1. In GL, an input/output device that returns a value in a range. For example, a mouse is logically two valuators: the x position and the y position.
  2. An input device that provides a scale value; for example, a thumb wheel or a potentiometer.


  1. The content of a data item. The value can be an integer, a string, or the handle of another data bag.
  2. In programming, the alphabetic or numeric contents of a variable or a storage location.
  3. A set of characters or a quantity associated with a parameter or name.
  4. When standardizing data, a phrase, a word, or a set of one or more characters that is used for analyzing and processing text. See also class, pattern, token.
  5. A specific data item at the intersection of a column and row.
  6. The content of a variable, parameter, special register, or field.
  7. In DCE X/Open Object Management (XOM), an arbitrary and complex information item that can be viewed as a characteristic or property of an object.
  8. The smallest unit of data manipulated in SQL.

value added distributor (VAD)
A distributor who enhances a product, for example, through pre-loading software, configuring and testing equipment or by providing training, support and marketing programs to the resellers.

value-added network (VAN)
A network that provides services and capabilities to its subscribers that are not readily available on public networks. For example, a value-added network might offer protocol conversion or access to a specialized database.

value-added reseller (VAR)
A seller who adds functionality or specific additional components to an existing product and resells it to a particular customer base.

value-added service (VAS)
An activity that is performed in response to a customer demand. Value added services can be activities performed on a product before the product is delivered to the customer, or a provided service that is performed at the customer site. See also ticketing.

value-added tax (VAT)
A transactional consumption tax charged on most public and private consumption.

value-based metric
A metric that displays one or many calculated metric values, which are grouped by one or more dimension values.

value chain

  1. A set of interdependent companies that work closely together to manage the flow of products and services along the entire value-added channel. The "chain" is made up of the variety of links, including manufacturers, consultants, distributors, resellers, and service providers, required to provide the intended value to the final customer.
  2. The sequence of all the activities needed to envision, create, engineer, produce, distribute, market, and sell a set of related products or services. The value perceived by the end-consumer of the product or service is derived in part from each step in the chain, although not all steps create the same amount of value or deliver the same profit potential. Each step in the chain requires distinct assets and capabilities.

value chain business model
A business model that supports transactions involving multiple enterprises or parties. Products, goods, services, or information are delivered through the parties of the value chain from producers to end users. See also supply chain.

value chain design
Components of the value chain design are: scope, stakeholders, key linkages, level 1-3 processes, sources of value, attributes and a graphical representation of the processes.

value chain implementation framework
Framework that provides a common approach for consistent implementation of value chains across IBM organization, but also allows for the unique requirements of each value chain.

value chain management system
System built on existing Business Transformation Management System (BTMS) structures (IRB, IPMT, PDT) and addresses new organization linkages, enabling cross-organization decision-making and funding of value chain investments. It includes all value chain stakeholders. The management system drives, integration of value chain strategy and plans with stakeholder business unit(s) strategy and plans, establishment of value chain specific business policies, prioritization of value chain specific investments, and resolution of value chain specific issues.

value chain sources of value
Qualities or characteristics of the value chain that add value to the customer and/or enterprise, and are direct or indirect drivers of the value chain's profitability. Sources of value may be internal to the enterprise (e.g.: easy-to-use sales tools), or external (e.g.: competitive speed to market). One source of value may span multiple processes within the value chain. Source of value provide the basis for prioritizing and directing business transformation investments in order to yield the greatest value to the enterprise and to its customers.

value map
A map that is used to transform source values to a new value during the extraction process in order to standardize common definitions for data from multiple sources.

value object
A self-contained binary object that provides standard interfaces to its callers. Value objects can be used in client applications.

value selector
A selector that can be used to specify values for expressions from data sources or components appropriate for the data type.

value set
A named set of values that can be used to override the default values for the job parameters that are grouped in a parameter set. See also job parameter, parameter set.

value type
In query management, one of the arguments passed to the extended interface. The value type specifies the data type of the value associated with the keyword.

value unit (VU)
The contents of a storage location which specify a set of characters associated with the policy.

value unit exhibit (VUE)
A conversion table for an IPLA product that converts millions of service units (MSU) to value units (VU).

See value-added network.

See value-added reseller.


  1. Data that passes from one step to another in a process. For example, a process that automates escalation of customer issues needs variables to hold information, such as the customer's name and the issue ID.
  2. A representation of a changeable value. See also global variable, job stream, term placeholder, variable scope.
  3. A specific attribute in the case data set that can pertain to a question or combination of questions, responses, and so on based on the question type. For example, a variable can represent a question on a printed questionnaire and store the responses to the question.
  4. In Rational Team Concert, a user-defined parameter that can be included in the command and option strings of the translator.
  5. A user-defined default value specified in an access definition.
  6. An entity that represents an unknown quantity that is determined as a result of solving the mathematical program containing the variable. In this context, a variable may be governed by one or more formal constraints. See also data element, decision variable, script variable.

variable buffer
A storage area used to pass dialog variables between the application program and the user interface manager (UIM).

variable builder
A builder that produces a component analogous to a programming variable for the web application. Within the variable builder, the type of variable can be declared, based on the variable content.

variable component name
A component of a group type that includes the literal at the end of the name because it represents more than one type. The literal ANY acts like a wild card, which represents any type whose name could appear in that place.

variable cost
An operating cost that varies directly with production volume; for example materials consumed, direct labor, sales commissions.

variable data

  1. In printers, data that can vary, for example, the names and addresses in form letters. See also constant data.
  2. In AFP Utilities, an element in the record layout whose value is represented in the database file. See also fixed data.

Property of a record or field that can have a varying length.

variable length
The length of a record or field that can be changed. See also fixed length.

variable-length-delimited data format
A data format that enables delimited files, such as comma-separated variable (CSV) files, to be mapped.

variable-length-delimited root element
A root element that represents the variable-length-delimited document that Sterling B2B Integrator is mapping. The variable-length-delimited root element is a group and can contain groups and records.

variable-length field
An area of altering range that contains data, and is prefaced by an internal, opaque area that provides the length of the field.

variable-length record

  1. In distributed data management (DDM) and Distributed FileManager (DFM), a record whose length can be changed after it has been written to a file. Variable-length records are normally used in reference to count-key-data (CKD) and extended count key data (ECKD) formats. See also fixed-length record.
  2. In COBOL, a record associated with a file whose file description entry or sort-merge description entry permits records to contain a varying number of character positions.
  3. A record having a length independent of the length of other records with which it is logically or physically associated. See also fixed-length record.

variable-length string
See varying-length string.

variable-length variable blocked (VLVB)
Data format of messages transmitted between CICS and IMS.

variable message sign (VMS)
A traffic control device whose message can be changed manually, electrically, mechanically, or electromechanically to provide motorists with information about traffic congestion, traffic crashes, maintenance operations, adverse weather conditions, roadway conditions, organized events, or other highway features (for example, drawbridges, toll booths, and weigh stations).

variable-occurrence data item
In COBOL, a table element that is repeated a variable number of times. Such an item must contain an OCCURS DEPENDING ON clause in its data description entry, or be subordinate to such an item.

variable pattern
In REXX, a parsing pattern that uses variables to specify where a string of characters is parsed. The value of the variable can be set by the user and can change while running.

variable pool
In the user interface manager (UIM), the collection of dialog variables defined for an opened application program.

variable pool interface
In REXX, an application program interface that allows programs written in other languages to access variables being used by or contained in an active REXX program.

variable record
The named element of a panel group that identifies the content and layout for the storage area of the dialog variables.

variable scope
The collection of objects for which a variable is visible. See also JobStream variable, substitution variable, variable.

variable space
In architecture, a method used to assign a character increment dimension of varying size to space characters. The space characters are used to distribute white space within a text line. The white space is distributed by expanding or contracting the dimension of the variable space character's increment dependent upon the amount of white space to be distributed.

variable space character
In architecture, the code point assigned by the data stream for which the character increment varies according to the semantics and pragmatics of the variable space function. This code point is not presented, but its character increment parameter is used to provide spacing.

variable space character increment
In architecture, the variable value associated with a variable space character. The variable space character increment is used to calculate the dimension from the current presentation position to a new presentation position when a variable space character is found.

variable space font
See proportionally spaced font.

variable substitution
The ability to replace the name of a variable with the value that it represents, and to display those values in a string.

variable symbol
In a REXX exec, a symbol that is assigned a value by the user or in some cases by the REXX interpreter. The value of a variable symbol can be tested and changed using control statements.

variable trade fund
The sum of performance allowances and forward buy allowances.

variable workload license charge (VWLC)

variance at completion (VAC)
The difference between the budget at completion less the estimate at completion. A negative result indicates the task or project is over budget.

variance task
A second step count task that is created for a location item that had a mismatch in the first count.


  1. A version of an artifact or a product that is identified by a specific set of characteristics that distinguish it from other artifacts or products in the product line, where each variant can exist at the same time as other versions of the artifact or product. See also product, product line, variation point.
  2. A version of a storage bucket. Each variant can have a different configuration (for example, encryption settings, lifespan settings).

variant action
An action that is derived from another action so that the content of the action can vary. A field in the variant action object can derive its value in a different way from the way that the same field derives its value in the base action object.

variant configuration
A high-level specification that is used by the manufacturer to describe the design and functional capabilities of an aircraft and that can be divided into subvariants to describe additional differences in tracked positions, allowable part numbers, and maintenance policy.

variant function

  1. See non-deterministic function.
  2. A user-defined function that might return different values when passed the same arguments. A variant function can contain SQL statements. See also nonvariant function.

variant routine
A routine that can return different values when it is invoked with the same arguments.


  1. See configuration.
  2. The fourth, optional level in the software hierarchy, located after product, version, and release. A release of a product can have multiple variations. See also modification level, parent software, release, software hierarchy, version.

variation point
An aspect of a design with multiple potential values that, when chosen, define one of the characteristics that distinguish one product from another within a product line. See also product line, variant.

variation product
A product that is available in different variations. For example, a shirt maybe be available in different size variations, such as small, large, and extra large, and color variations, such as black, white, and red.

varied off
Pertaining to a device, controller, line, network interface, or independent disk pool unavailable for its normal, intended use.

varied on
See available.

varying-length string

  1. A character, graphic, or binary string with a length that is not fixed but that can range within set limits.
  2. A character or graphic string whose length is not fixed, but variable within limits. See also fixed-length string.

vary off
To make a device, control unit, or line unavailable for its normal intended use.

vary offline
To change the status of a device or library from online to offline. When a device or tape library is offline, no data can be accessed on the device or tape library. Varying an optical library offline does not affect the online or offline status of the drives it contains.

vary on
To make an independent disk pool available for its normal, intended use. All of the primary and secondary disk pools in a disk pool group will vary on together.

vary online
To change the status of a device or library from offline to online. Varying online makes available for access the device or library being varied online.

See value-added service.

See vSphere Storage APIs for Storage Awareness.

See value-added tax.

Vault Trust Certificate
A Domino certificate issued by a certifier indicating trust of an ID vault to store the IDs of users under the certifier.

See Visual Basic.

See virtual circuit.

See virtual card.

See vdisk configuration data.

In ODM, a terminal descriptor type used to define a variable as a variable-length, null-terminated string.

See virtual channel identifier.

See virtual channel identifier.

See V-type constant.

See Verband der Automobilindustrie.

See virtual device driver.

A numerical expression that enables a consistent way to evaluate the vulnerability of your applications. V-Density is calculated by relating the number and criticality of vulnerabilities and exceptions to the size of the application or project being analyzed.

See virtual disk.

vdisk configuration data (VCD)
Configuration data associated with a disk.

VDisk-to-host mapping
See host mapping.

See vital product data.

See visual data stream.


  1. In the GDDM function, a directed line segment, which is a straight line between two points.
  2. A linearly ordered collection of scalars of the same type. Each scalar is said to be an element of the vector. See also array, scalar.
  3. An array of one dimension.
  4. In SNA, a data structure containing three fields: a length field that specifies the length of the vector in which it is contained, an identifier or type field, and a value field. The value field may contain subvectors.

vectored I/O
See scattered read.

vector instruction
An instruction, such as a load, store, arithmetic, or logical instruction, that operates on vectors residing in storage or in a vector register in the vector facility. See also scalar instruction.

vector processor
A processor that can perform operations on multiple data elements, such as the elements of an array, simultaneously.

vector symbol set (VSS)
In the GDDM function, a set of characters each of which is treated as a small picture and is described by a sequence of lines and arcs. Characters in a vector symbol set can be drawn to scale, rotated, and positioned precisely. See also image symbol set.

vehicle ID
A unique identifier for a transit vehicle that is being displayed on the map.

A Java-based template engine that provides a simple and powerful template language to reference objects defined in Java code. Velocity is an open source package directed by the Apache Project.


  1. The measure of how fast work should run when ready, without being delayed by contention for managed resources.
  2. The turnover rate of an individual SKU. SKUs that sell quickly with quick turnover are high velocity items.
  3. The speed at which data is acquired and used.

velocity code
A code that identifies the velocity of a SKU. This code is used in location selection in a warehouse to ensure that higher velocity items are stored closer to the shipping area than low velocity items.

velocity goal
A service class performance goal that defines the acceptable amount of delay for work when work is ready to run.


  1. A service provider that provides the telecom services to customers.
  2. A person or company that supplies materials or services to another person or company.

vendor acquisition
The acquisition of a service provider. The impact of such an acquisition is seen on the billing accounts.

vendor compliance
An optional module that allows buyers to set up and enforce compliance rules with suppliers.

vendor cost change
See manufacturer cost change.

vendor days credit
The number of days extended to the customer before payment is due.

vendor ID
In License Use Management, the identifier for a vendor of licensed products that enables license servers to distinguish among any number of vendors established in a network. See also Universally Unique Identifier.

Vendor Independent Messaging (VIM)
An application program interface (API) defined by Apple Computer, Inc.; Borland International, Inc.; Lotus Development Corporation; and Novell, Inc.

vendor-managed use control
A level of password use control in which the vendor manages compliance with the terms of the software product acquisition. See also customer-managed use control, password use control level.

vendor neutrality
A functionality that is provided to keep the identities of buyers and suppliers protected until order activation.

vendor requirement
A maintenance task that is recommended by the vendor or by the original equipment manufacturer (OEM) of the aircraft or piece of equipment. See also national requirement.

Venn diagram
A graphic image consisting of overlapping circles that represent the logical relationship of two or more sets of information.

See Virtual Ethernet Port Aggregator.


  1. See people assignment criterion.
  2. In SNA, the general name for a transaction program's request for communication services.
  3. A reserved word that expresses an action to be taken by an application programming interface (API), a compiler, or an object program. See also LU 6.2 verb.

The process of associating terms and phrases to elements of the business object model (BOM). See also constant.

Verband der Automobilindustrie (VDA)
A standard developed by the German Association of the Automotive Industry to ensure the integrity of products and processes are up to German manufacturing standards.

verbatim response
See text.

The assessment of the performance of a system under test.


  1. The act of confirming that a user is eligible to use a RACF-defined user ID.
  2. The process of checking to ensure that the contents of a message are correct.
  3. The act of confirming a task was successful.
  4. The process the system uses to authenticate certificate signatures.

verification point
A baseline of the data being tested.

verification status
A true or false condition that indicates whether an authorized resource manager or project manager has verified the personal information of a resource.


  1. In an AIX PowerSC environment, the remote partition that determines whether a collector performed a Trusted Boot operation.
  2. A device that checks the correctness of transcribed data, usually by comparing it with a second transcription of the same data or by comparing a retranscription with the original data. (I) (A)
  3. In bar code systems, a device that measures the bars, spaces, quiet zones, and optical characteristics of a bar code symbol to determine if the symbol meets the requirements of a bar code symbology, specification, or standard.

To determine whether a transcription of data or other operation has been accomplished accurately.

Versatile Storage Specialist
The web-based management interface to the Versatile Storage Server.


  1. The second level in the software hierarchy, located between product and release. A product can have multiple versions, and a version have multiple releases. See also parent software, release, software hierarchy, variation.
  2. A backup copy of a file stored in server storage. The most recent backup copy of a file is the active version. Earlier copies of the same file are inactive versions. The number of versions retained by the server is determined by the copy group attributes in the management class.
  3. An object that implements a particular revision of an element. The versions of an element are organized into a version tree structure. See also checked-out version.
  4. A change to the content of a project. Each time a project changes, for example, with the addition of new questions or categories, a new version can be generated.
  5. The referenceable state of an artifact. In a linked data system, each version can be referenced with a unique URI. See also artifact, configuration, configuration specification, revision.
  6. A group of resources that represent a particular version of a component. See also full version, incremental version.
  7. A separately licensed program that typically has significant new code or new function.
  8. A member of a set of similar programs or packages and, in DB2 for z/OS, similar database request modules (DBRMs) or large objects (LOBs).
  9. In CARMA, a previous copy of a member held by an SCM system. Versions in CARMA can be created only for CARMA members. The actions available on versions depend on the SCM system that it originates from and the RAM that is used to connect to the SCM system. Some RAMs can alter versions; other RAMs make the versions read-only.
  10. Applications with the same ID but different validity dates.
  11. The set of properties and content associated with an instance of a document in an object store. A version is created each time a document is checked out, edited, and checked in. A document version can be designated as a major version or a minor version.

version chain
A representation of the relationship among the different versions of a virtual image depending on the criteria used when the image is checked in or imported into the reference repository.

version control
The coordination and integration of the history of work submitted by a team. See also team support.

versioned object base (VOB)
A repository that stores versions of file elements, directory elements, derived objects, and metadata associated with these objects.

versioned resource
A resource, such as a business process model, for which multiple copies, or versions, are saved in the system. Each time a versioned resource is modified, the system saves the data as a new version so that old versions can be reverted to as needed.

version file system
See root file system.

version history
A record of modifications made to a web template. Each time a web template is edited, a new version is created, but the original web template remains intact for future use.

version identifier
A string that identifies a version of a product, thereby allowing the license server to distinguish among different versions of a product.

version information
Unique, identifying information associated with a project, document, or requirement each time it is modified. The internally generated revision number, combined with information about the author, date, time, and reason for modification, constitute version information. See also revision.

The maintenance of different versions of an uploaded file by the Files application. When a file is uploaded initially, a first version is created. When someone with editor access uploads the file again, a new version is created. All previous versions are maintained. Versions can be deleted.

versioning security template
An ACL associated with a particular document version state. Versioning security templates can define ACLs for the four possible version states: Reservation, Released, In Process, or Superseded. A versioning security template is applied through a security policy. See also application security template, template.

version number
The version level of a program, which indicates the hardware and the basic operating system used.

version policy
A set of characteristics that determines how versions of RuleApps and rulesets are numbered and whether to augment or replace what is deployed on a Rule Execution Server instance.

version recovery
The restoration of a previous version of a database, using an image that was created during a backup operation. See also crash recovery, rollforward recovery.

version series
A series containing all versions of a document.

version status
The state of a version. Minor versions have the status In Process, Reservation, or Superseded. Major versions have the status Released, Reservation, or Superseded.

version tree

  1. A graphic representation of a versioned object that shows all branches and the versions on each branch.
  2. The hierarchical structure in which all the versions of an element are (logically) organized. The version tree display also shows merge operations.

See left page.

In graphs, a point that is the end of an arc or the intersection of multiple arcs.

Pertaining to data that is tracked within the same application and domain. See also horizontal.

vertical bar code
A bar code pattern that presents the axis of the symbol in its length dimension parallel to the Ybc-axis of the bar code presentation space.

vertical clustering
A topology in which a single machine employs multiple CPUs. See also cluster environment, horizontal clustering.

vertical context
The method used to distinguish one transaction flow from another within an application or group of applications. The vertical context enables Transaction Tracking to group individual transactions as part of a flow, label a node in a topology map, and link to a Tivoli Monitoring application.

vertical dimension
A dimension that runs down the display and defines the contents of the row dimension(s).

vertical font size
The distance measured perpendicular to the baseline when character rotation is zero degrees. It represents the baseline-to-baseline increment that includes the vertical size of the character and the designer's recommendation for the internal leading (space above and below the character).

vertical format
See portrait.

vertical format information
In TCP/IP, information, such as tab markers, that automatically positions lines of text with respect to other lines of text, according to defined rules. Vertical format information is usually associated with word processing.

vertical justification
Redistribution of the extra vertical white space at the end of a column between lines of text, so as to make the columns appear to be the same length.

Vertical Licensed Internal Code (VLIC)
Programming that defines logical operations on data. The Vertical Licensed Internal Code translates the machine interface (MI) instructions.

vertically displayed records
Subfile records that are grouped so that each record is displayed on one or more lines. Each record begins a new line.

vertical retrace
The action of moving the electron beam from the bottom to the top of the screen.

vertical scale factor
In outline-font referencing, the specified vertical adjustment of the em square. The vertical scale factor is specified in 1440ths of an inch. When the horizontal and vertical scale factors are different, anamorphic scaling occurs. See also horizontal scale factor.

vertical scaling
Setting up multiple application servers on one machine, typically by creating cluster members.

vertical service provider
An industry-focused application service provider.

vertical sharding
The process of merging shards either before or during indexing. The data that is being merged with vertical sharding is preprocessed data, but not yet indexed.

vertical stacking
The process of starting more than one instance of the dynamic cluster on a node to manage bottlenecks.

vetoable change listener
A change listener that is notified whenever a constrained property is updated.

See virtual file system.

See virtual function table.

See volume group.

See VTAM Generic Resources.

VGR affinity
For VTAM Generic Resources, an association, managed by VTAM or IMS, that a VTAM logical unit has with a specific IMS in a generic resource group.

See Voluntary Inter-industry Communication Standards.

victim buffer
The portion of the buffer pool that was used to store a victim page, which subsequently is replaced by a new page. See also victim page.

victim page
A page in a buffer pool that is selected to be written out to disk to make room for another page to be read into the buffer pool. See also victim buffer.

The broadcast of live video to all participants in a conference.

video logistics
The process of managing and reporting video assets through integration into a platform's asset management (micro) and content management (macro) functions.

video management system (VMS)
A third-party software application for managing video surveillance systems that provide the video stream source for Intelligent Video Analytics.

video mixing
The process of dynamically inserting or combining multiple video objects into a single object for distribution. An example would be the mixing of commercials and broadcast programs for satellite distribution.

video object
The data file containing a program recorded for playback on a computer or television set.

video-on-demand (VOD)
A service for providing consumers with movies and other programming almost immediately, per request.

video stream
The path data follows when read from the IBM Content Manager VideoCharger Server system to the display unit.

video tripwire
A reference line that is drawn in the field of view of a camera channel. An object that crosses this line triggers an alert.


  1. A pane or window within the IDE frame. A view can be an editor or navigator or can provide an alternate way to visualize and work with a project. A view has its own menu and may have its own toolbar.
  2. See channel.
  3. In Eclipse-based user interfaces, any pane in the workbench that is outside the editor area and can be stacked (dragged and dropped) on top of other views. Views provide different ways to look at or work with the resources in the workbench.
  4. A set of attribute collections with specifications about whether those attributes are viewable, editable, or both. A view belongs to a container and can be applied when viewing entries in that container, to change the fields that can be viewed or edited. See also attribute collection, core attribute collection.
  5. A virtual table that is created by joining two or more tables together. Views can also include the results of calculations.
  6. To click a posted URL link on a social network to see a posted message.
  7. A pane that is outside of the editor area that can be used to look at or work with the resources in the workbench.
  8. The metadata that describes how the runtime system samples the tuples in a stream for visualization.
  9. A logical table that is based on data stored in an underlying set of tables. The data returned by a view is determined by a SELECT statement that is run on the underlying tables. See also base table, table.
  10. In the CICSPlex SM API, a temporary, customized form of a resource table. A view can consist of some or all of the resource table attributes in any order.
  11. A window that displays requirements, the attributes assigned to requirements, and the relationships between requirements. See also Attribute Matrix, traceability matrix, traceability tree.
  12. In the CICSPlex SM web user interface, a formatted display of selected data about CICS resources or CICSPlex SM definitions. The data in a view is obtained from a query and can be presented in one or more forms. The data can be limited to a subset of CICSplex resources or definitions by establishing a context and scope.
  13. A defined set of tasks that are displayed in the console navigation. Views provide a way to filter the content of the navigation.
  14. A window pane, or frame, in a workspace. It may contain data from an agent in a chart or table, or it may contain a terminal session or notepad, for example. A view can be split into two separate, autonomous views. See also attribute group.
  15. A representation of table data that can contain columns from one or more tables.
  16. A dynamically controlled subset of the columns of one or more database tables. A view can give the programmer control over what information the user sees and manipulates and represents a virtual table that holds the results of a specified SELECT statement.
  17. A pre-built module that combines multiple fields and provides additional logic.
  18. A subset of information that can be displayed by applying filters or sorting.
  19. A reusable user interface that is used for a business object or human service. A view consists of one or more other views, data bindings, layout instructions, and behavior.
  20. In an AQL extractor, logical statements that define how to extract terms or concepts.
  21. The form in which an object is presented. A choice in the action bar that a user selects to look at an object from various perspectives is an example of a view.
  22. A ClearCase object that provides a work area for one or more users. For each element in a VOB, a view's configuration specification selects one version from the element's version tree.
  23. A representation of a document, image, or annotation.
  24. The action of a social network contact clicking a posted URL link to see a posted message.
  25. In Eclipse-based user interfaces, a pane that is outside the editor area, which can be used to look at or work with the resources in the workbench.

Pertaining to a mapped window whose ancestors are all mapped; not necessarily visible. Graphics requests can be performed on a window when it is not viewable, but output will not be retained unless the server is maintaining backing store.

view command
A command that is used to compose a view as a response to a client request.


  1. A vehicle that is used to display data returned from a data source. A viewer can be a spreadsheet, a word processor, or a built-in display function.
  2. A piece of client software that is used to produce a graphical display of document or image content that is stored in a file.
  3. One or more individuals who can view but not modify information.

view filter
A filter that controls the data shown in a window in real time, using multiple criteria and wildcard characters.

view folding
A query plan strategy for joined queries in which one or more of the data sources is a view, by which the query optimizer incorporates the view definitions into the main query. For queries in which this technique is possible, view folding can significantly improve performance, as compared to materializing the view as a temporary table.

view group
See channel group.

viewing coordinate
See eye coordinate.

viewing matrix
In GL, a matrix used to describe the location of the viewer (the virtual eye looking upon a scene) in relation to the world.

viewing transform
In architecture, a transform that is applied to model-space coordinates. See also model transform.

viewing transformation
In GL, a type of transformation that maps from world coordinates to viewer coordinates. The origin of the viewer coordinate system can be thought of as the location of the viewer's "eye". Viewing transformations can be used to move the "eye" around in world coordinates.

viewing window
In architecture, that part of a model space that is transformed, clipped, and moved into a graphics presentation space. See also trimming.

view layout
A publish schema that consists of a layout of views over text values.

A web user interface widget that is added and displayed in a dashboard page.


  1. The viewing area on a mobile device, such as a smartphone, to view all or part of a user interface. The viewport is dependant on the zoom level and display dimensions of the mobile device.
  2. That portion of a partition or usable area defined for display of data to the operator. The viewport has a predefined size and position on the screen and is related to a presentation space through a specified window. See also presentation space.
  3. In the GDDM function, a rectangular area within the picture space that defines where the output of the current page appears on the work station.
  4. In BMS, that part of a screen that is allocated to a partition. See also partition.
  5. In GL, the last transformation in the graphics pipeline, which is used to map from normalized device coordinates to device coordinates. The viewport maps the unit cube x/w = +/-1, y/w = +/-1, z/w = +/-1 to the screen space, as measured in pixels.

view-private object
A file or directory that exists only in a particular view and is not under version control.

view synchronous high-availability manager group
A special class of high availability (HA) group that can be created and used by components that require a certain virtual synchrony (VS) quality of service (QoS) for group communication.

vignette tax
A fixed-fee tax on a product that does not represent a proportional amount of the product price.

See Vendor Independent Messaging.

A division of data into 20 ordered groups of equal size. See also decile, quantile, quartile, quintile.

See virtual input/output.


  1. The state of a service level agreement (SLA) when one or more service level objectives are not met. SLA violations can be used to trigger a remediation policy for affected customers.
  2. In Sterling Order Management, an instance of an override rule that has been violated in a transaction.
  3. An act that bypasses or contravenes corporate policy.

violation condition
A condition that indicates the actual measured value has not met the specified breach condition. This condition applies to a total or average type breach value. For example, if the total breach value was specified as 100, and its associated breach condition was specified as 'actual greater than supplied,' and the actual measured value was 110, then a violation is produced.

violation event
an event that is generated or triggered when a transaction performs outside of acceptable bounds (performance threshold) or fails completely (transaction status threshold). See also recovery event.

violations table
A table that holds rows that fail to satisfy the constraints and unique index requirements during data manipulation operations on base tables. See also diagnostics table.

violation status
In performance monitoring, the status of an active policy that indicates that a threshold is violated. In the hourly average view, this means the average performance time of all transactions that occurred during the hour is outside the threshold. In the instance view, the performance time of the instance is outside the threshold. See also interpreted status.

See Virtual I/O Server.

VIOS logical partition
A partition running the Virtual I/O Server (VIOS) software that facilitates the sharing of physical I/O resources between client logical partitions within a server.

VIO storage group
See virtual input/output storage group.

See virtual IP address.

viral suppression
A method of email suppression that prohibits certain types of mailings, such as "forward to a friend" mailings, to be sent to a contact who has opted out of the original database.

Pertaining to not physically existing as such but made by software to appear to do so.

virtual address
The address of a location in virtual storage.

virtual address space
In virtual storage systems, the virtual storage assigned to a job, terminal user, or system task. See also address space.

virtual address translation
The conversion of virtual storage addresses to real storage addresses.

virtual appliance

  1. A virtual machine image with a specific application purpose that is deployed to virtualization platforms.
  2. A prepackaged software application that provides some well-defined business workflow, making it easier to deploy a solution with minimal configuration. Many tiers of operating systems and applications can be packaged as a single virtual appliance. See also Open Virtualization Format, virtual server collection, virtual server image.

virtual application
A deployment of a standardized set of middleware and resources that is used to run specified types of workloads. Virtual applications are created with optimized patterns and offer more convenience than virtual systems by abstracting the middleware infrastructure and allowing users focus on developing applications. See also virtual application pattern, virtual system.

virtual application instance
A single deployment of a virtual application pattern.

virtual application layer
A group of components in a virtual application pattern that facilitate complex virtual application design. A virtual application layer enables virtual application patterns to be reused in different contexts; one virtual application pattern is used as a reference layer in another virtual application pattern.

virtual application pattern
An application-centric pattern that defines the resources that are required to support virtual applications, including web applications, databases, user registries, and more. These patterns are the deployment unit for a virtual application. See also pattern, virtual application, virtual system pattern.

virtual application pattern plug-in
The resources and automation that provide the specific capabilities for a virtual application component. See also virtual application pattern type.

virtual application pattern type
A set of virtual application pattern plug-ins for a specific type of application or application capability. For example, the IBM Web Application Pattern pattern type provides the components, links, policies, and automation that are required to deploy web applications. See also virtual application pattern plug-in.

virtual call
An X.25 user facility in which a call setup procedure and a call clearing procedure determine a period of communications between two DTEs in which the users' data will be transferred in the network in the packet mode of operation. All the users' data is delivered from the network in the same order in which it is received by the network. Synonym for switched virtual call.

virtual call facility
In data communication, a user facility in which a call setup procedure and a call clearing procedure determine a period of communication between two data terminal equipments (DTEs) in which user data is transferred in the network in the packet mode of operation. All user data is delivered from the network in the order it is received by the network.

virtual capacity
The amount of storage that is available. In a thin-provisioned volume, the virtual capacity can be different from the real capacity. In a standard volume, the virtual capacity and real capacity are the same.

virtual card (vCard)
A file that stores basic contact information, following the Internet Mail Consortium specification.

virtual channel connector
A connector that is used in a terminal services environment. The virtual channel connector establishes a virtual communication channel to manage the remote sessions between the Client AccessAgent component and the Server AccessAgent.

virtual channel ID
See virtual channel identifier.

virtual channel identifier (VCI)

  1. In asynchronous transfer mode (ATM), the locally unique numeric tag in the ATM cell header that is used to identify a virtual channel connection (VCC) within a virtual path connection (VPC). The VCI is unique only in combination with the virtual path identifier (VPI) and is defined by a 16-bit field in the ATM cell header.
  2. A 2-byte hexadecimal value that is used to uniquely define an ISM device.

virtual circuit (VC)
In a packet-switching data network, a logical end-to-end transmission channel, as opposed to a physical connection. Virtual circuits allow physical transmission facilities to be shared by many users simultaneously. See also data circuit, physical circuit.

virtual column

  1. A column of information derived from an SQL statement that is not stored in the database.
  2. In information analysis, a single column or a concatenation of two or more columns that can be analyzed as if it is an existing physical data column.

virtual-column index
A type of generalized-key index that contains keys that are the result of an expression.

virtual concurrent copy
An operation that uses SnapShot to provide a concurrent copy-like function when the source volume supports SnapShot, but not concurrent copy. Virtual concurrent copy is also referred to as CC-compatible SnapShot.

virtual controller

  1. A controller description that emulates the function of a physical controller for communication with a remote device. As an example, when a PC is attached to a system, a virtual controller must be created to allow the PC to communicate with the system.
  2. A controller description that is used by Advanced Peer-to-Peer Networking (APPN) and high-performance routing (HPR) support to attach and manage APPN device descriptions. This type of controller does not represent a connection to a remote station.

virtual desktop
A user interface in a virtualized environment, stored on a remote server.

virtual desktop infrastructure
An infrastructure that consists of desktop operating systems hosted within virtual machines on a centralized server.

virtual device

  1. A device that appears to the user as a separate entity, but is actually a shared portion of a real device.
  2. A device description that does not have hardware associated with it. It is used to form a connection between a user and a physical work station attached to a remote system. A virtual device can be a virtual display station or a virtual printer.

virtual device driver (VDD)
See device handler.

virtual device number
In z/VM, a device number used by a guest virtual machine. Real devices can be referred to by different virtual device numbers by different guest virtual machines.

virtual disk

  1. See volume.
  2. See volume.

virtual Ethernet
An alternative to using physical network cards to connect multiple partitions and integrated servers within a system.

Virtual Ethernet Port Aggregator (VEPA)
The capability of a physical server to collaborate with an adjacent bridge to provide frame relay services between multiple virtual machines, which are located on a server and also on the external network.

virtual export
A volume marked as exported using the DFSMSrmm subcommands.

virtual Fibre Channel adapter
A virtual adapter that provides client logical partitions with a Fibre Channel connection to a storage area network through the Virtual I/O Server logical partition. The framework uses N_Port ID Virtualization (NPIV) and each virtual Fibre Channel adapter has a pair of unique Worldwide Port Names (WWPNs) associated with it.

virtual file space
A representation of a directory on a network-attached storage (NAS) file system as a path to that directory.

virtual file system (VFS)
A remote file system that has been mounted so that it is accessible to the local user.

virtual function table (VFT)
In C++, an initialized table that facilitates polymorphism by indexing the addresses for the virtual functions available to a class hierarchy. The compiler creates at least one virtual function table for each class, unless the class has no virtual members.

virtual host
A configuration that enables one host to resemble multiple logical hosts. Each virtual host has a logical name and a list of one or more DNS aliases by which it is known.

virtual image

  1. A CD or DVD image that is stored on system disks. Virtual images are stored in the integrated file system and can be in either Universal Disk Format (UDF) or ISO 9660 format.
  2. A stand-alone virtual environment, including operating system and binary files, that is used to define a virtual system. See also image.

Virtual Infrastructure Access Services
See Smart Business Desktop Cloud.

virtual inode (v-node)
An object in a file system that represents a file. V-nodes are used to communicate between the upper half of the file system (the logical file system) and the file system implementations (such as the journaled file system, the network file system, and the CD-ROM file system).

virtual input/output (VIO)
A set of storage, server, and network virtualization features that improve performance by binding input/output to a single connection.

virtual input/output storage group (VIO storage group)
A type of storage group that allocates data sets to paging storage, which simulates a direct access storage device (DASD) volume. VIO storage groups do not contain any actual DASD volumes. See also storage group.

virtual interview
A set of questions that is presented to custodians in a web form. Virtual interviews are part of the legal discovery process. They are typically used to help refine the list of custodians who should be added to the scope of a legal request or to set the parameters of documents that must be preserved or collected. Virtual interviews can be created as part of a virtual interview plan and can be used as the confirmation method for a hold notice.

virtual interview plan
A legal discovery process that contains a virtual interview notice. The virtual interview plan provides processing attributes, such as whether the content of the notice must be approved, how often the interview notice is resent to custodians, the date by which responses are due, or how to handle nonresponsive custodians.

Virtual I/O Server (VIOS)
Software that facilitates the sharing of physical I/O resources between client logical partitions within the server.

virtual IP address (VIPA)
An IP address that is shared among multiple domain names or multiple servers. Virtual IP addressing enables one IP address to be used either when insufficient IP addresses are available or as a means to balance traffic to multiple servers.


  1. A software technology that allows multiple operating systems to run on the same processor at the same time. See also subcapacity.
  2. A technique that encapsulates the characteristics of resources from the way in which other systems interact with those resources.
  3. The substitution of virtual resources for actual resources, where the virtual resources have the same functions and external interfaces as their counterparts, but differ in attributes, such as size, performance, and cost. Virtualization is commonly applied to physical hardware resources by combining multiple physical resources into shared pools from which users receive virtual resources. See also bare metal, grid computing.
  4. The creation of a virtual computing resource such as an operating system, server, storage device, or network resources in a one-to-many or many-to-one association. For example, a single operating system might be divided into multiple partitions that operate as independent systems, or multiple disk devices might appear as a single logical drive. See also logical partition, partition, subcapacity.
  5. In the storage industry, a concept in which a pool of storage is created that contains several storage systems. Storage systems from various vendors can be used. The pool can be split into volumes that are visible to the host systems that use them. See also capacity licensing.

A property of the on-demand operating environment that makes the best use of technology resources and minimizes complexity for users. Virtualized networks deliver computing as needed. See also grid computing.

virtualized storage
Physical storage that has virtualization techniques applied to it by a virtualization engine.

virtual key ring
A set of certificates owned by a user ID and used by a user or server application to determine the trustworthiness of a client or peer entity.

virtual link
In Open Shortest Path First (OSPF), a point-to-point interface that connects border routers that are separated by a non-backbone transit area.

virtual local area network (VLAN)
A logical association of switch ports based upon a set of rules or criteria, such as Medium Access Control (MAC) addresses, protocols, network address, or multicast address. This concept permits the LAN to be segmented again without requiring physical rearrangement.

virtual logical unit number (VLUN)
A subset of a logical drive.

virtual lookaside facility (VLF)
A z/OS facility that enables named data to be kept in virtual storage instead of DASD.

virtual LU
An LU defined in MERVA Extended Connectivity for communication between MERVA and MERVA Extended Connectivity.

virtual machine (VM)

  1. An instance of a data-processing system that appears to be at the exclusive disposal of a single user, but whose functions are accomplished by sharing the resources of a physical data-processing system.
  2. In z/VM, the operating system that represents the virtual processors, virtual storage, virtual devices, and virtual channel subsystem allocated to a single user. A virtual machine also includes any expanded storage dedicated to it.
  3. A software implementation of a machine that executes programs like a real machine. See also virtual server.
  4. An emulation of a particular computer system. Virtual machines operate based on the computer architecture and functions of a real or hypothetical computer. Their implementations might involve specialized hardware, software, or a combination of both.
  5. An abstract specification for a computing device that can be implemented in different ways in software and hardware.

virtual machine disk (VMDK)
An open file format that describes the contents of virtual hard disk drives in virtual machines such as VMware.

Virtual Machine/Extended Architecture (VM/XA)

Virtual Machine/System Product (VM/SP)
An IBM operating system that supplies a virtual machine to each logged-on user.

Virtual Machine/System Product High Performance Option (VM/SP HPO)
An IBM-licensed program that can be installed and executed in conjunction with VM/System Product to extend the capabilities of the VM/System Product with programming enhancements, support for microcode assists, and additional functions. The VM/SP High Performance Option program package is not executable by itself. It requires installation of the VM System Product or an equivalent IBM-licensed program.

virtual member manager
A WebSphere Application Server component that provides applications with a secure facility to access basic organizational entity data such as people, logon accounts, and security roles.

virtual method
In object-oriented programming, a method that exhibits polymorphism.

virtual mount point

  1. The directory or file in the file tree where another file system is mounted. For example, if /dev/hd9 is mounted on /fred, then /fred is the virtual mount point.
  2. A directory branch of a file system that is defined as a virtual file system. The virtual file system is backed up to its own file space on the server. The server processes the virtual mount point as a separate file system, but the client operating system does not.

Virtual Network Computing (VNC)
A graphical desktop sharing system that uses the remote frame buffer (RFB) protocol to remotely control another computer. It transmits the keyboard and mouse events from one computer to another, relaying the graphical screen updates back in the other direction, over a network.

virtual node

  1. The node associated with a connection network when a route is calculated that goes through that connection network.
  2. The structure that contains information about a file system object in a virtual file system (VFS).

virtual optical device
An optical device of type 632B that supports virtual optical images. This device can be created with the Create Device Description (Optical) (CRTDEVOPT) command by using a resource name (RSRCNAME) of *VRT.

virtual optical storage
Storage on system disks that appears to the user to be storage on an actual CD or DVD.

virtual origin (VO)
The address of an element in an array with subscripts that are all zero.

virtual party
In telephony, a party that does not actually take part in a telephone call. A virtual party is represented by a special directory number or numbers.

virtual path connection (VPC)
In asynchronous transfer mode (ATM), a group of virtual channel connections that are switched together as one unit.

virtual path identifier (VPI)
In asynchronous transfer mode (ATM), an 8-bit field in the ATM cell header at the user-to-network interface (UNI) that indicates the virtual path connection over which a cell is to be routed.

virtual port
A software emulation of a port which is generally present in a hardware. This is most commonly used with modems and printers.

virtual printer

  1. In System i Access, a printer attached to a host system that can receive output from a personal computer for printing. A virtual printer allows a user to use a printer attached to the host system as though the printer were directly attached to a personal computer.
  2. A view of a printer that refers only to the high-level data stream (such as ASCII or PostScript) that the printer understands. It does not include any information about how the printer hardware is attached to the host computer or the protocol used for transferring bytes of data to and from the printer.

virtual printer definition
A set of attribute values that describe a particular data stream for a particular printer.

virtual private cloud
A private cloud that exists within a public cloud and is accessed through a virtual private network (VPN).

virtual private network (VPN)
An extension of a company intranet over the existing framework of either a public or private network. A VPN ensures that the data that is sent between the two endpoints of its connection remains secure. See also Internet Protocol Security.

virtual processor

  1. The defined processing capacity assigned to an uncapped partition as represented to the operating system.
  2. A multithreaded process that makes up the database server and is similar to the hardware processors in the computer. It can serve multiple clients and, where necessary, run multiple threads to work in parallel for a single query. See also asynchronous disk I/O virtual processor.
  3. A setting that defines the assigned processing capacity represented to the operating system. Virtual processors represent a processing capacity less than that of a physical processor. A logical partition in the shared processor pool must have at least as many virtual processors as its assigned processing capacity.

virtual root
A function that enables an administrator to associate a user ID with a mailbox so that the user can not see the hierarchy that embeds that mailbox.

virtual route (VR)
In SNA, either (a) a logical connection between two subarea nodes that is physically realized as a particular explicit route or (b) a logical connection that is contained wholly within a subarea node for intranode sessions. A virtual route between distinct subarea nodes imposes a transmission priority on the underlying explicit route, provides flow control through virtual route pacing, and provides data integrity through sequence numbering of path information units (PIUs). See also explicit route, path, route extension.

virtual-route-based transmission group
A transmission group that represents the virtual routes connecting the domains of the following nodes across a subarea network: (a) two interchange nodes, (b) an interchange node and a migration data host, or (c) two migration data hosts.

virtual route identifier (VRID)
In SNA, a virtual route number and a transmission priority number that, when combined with the subarea addresses for the subareas at each end of a route, identify the virtual route.

virtual route pacing (VR pacing)
In SNA, a flow control technique used by the virtual route control component of path control at each end of a virtual route to control the rate at which path information units (PIUs) flow over the virtual route. VR pacing can be adjusted according to traffic congestion in any of the nodes along the route. See also session-level pacing.

virtual route pacing response (VRPRS)
A nonsequenced, supervisory path information unit (PIU) that flows at network priority. It can overtake VR-sequenced PIUs and consists of a transmission header with no basic information unit (BIU) data.

virtual routing node (VRN)
A representation of a node's connectivity to a connection network defined on a shared-access transport facility, such as a token ring.

virtual SCSI (VSCSI)
A SCSI that is based on a client and server relationship. The Virtual I/O Server owns the physical resources and acts as server, or target device. Physical adapters with attached disks on the Virtual I/O Server partition might be shared by one or more partitions. These partitions contain a virtual SCSI client adapter that recognizes these virtual devices as standard SCSI-compliant devices and LUNs. See also Virtual I/O Server.

virtual SCSI client adapter
A virtual adapter in one logical partition that communicates with a virtual SCSI server adapter in another partition. A virtual SCSI client adapter allows a logical partition to access a storage device being made available by another logical partition. See also virtual SCSI server adapter.

virtual SCSI server adapter
An adapter in one logical partition that is available to a virtual SCSI client adapter in another logical partition. A logical partition to which a storage device is assigned can map that device to a virtual SCSI server adapter. See also virtual SCSI client adapter.

virtual sensor
A sensor that relays information on the site attributes, such as the physical dimensions of a zone. Dimensions of the coordinates, width, length, or height can be noted. These dimensions are assigned to a particular zone.

virtual server

  1. The logical service point that Content Platform Engine clients interact with. A virtual server can map to a single independent server instance or to a set of server instances. A client issues a request to a virtual server and one server instance responds. See also server instance.
  2. A system composed of partitioned, shared, or virtualized resources presented from a host system. An operating system and other software can be installed on a virtual server. See also logical partition.
  3. A logical construct that appears to comprise processor, memory, and I/O resources conforming to a particular architecture. A virtual server can support an operating system, associated middleware, and applications.
  4. A server that shares its resources with other servers to support applications. See also virtual machine.

virtual server collection
A set of virtual servers that are involved in supporting a workload. The set is not necessarily static. The constituents of the collection at any given point are determined by the virtual servers involved in supporting the workload at that time. See also Open Virtualization Format, virtual appliance, virtual server image.

virtual server image
A package containing metadata that describes the system requirements, virtual disks, and any goals and constraints for the virtual machine, such as isolation and availability. See also virtual appliance, virtual server collection.

virtual server image capture
Metadata and disk images stored as a virtual server image that can be referenced and used to create and deploy other similar images.

virtual server image clone
An identical copy (clone) of a virtual server image that can be used to create a new similar virtual server.

virtual server network (VSN)
The capability that provides enhanced access, security control, and integrated management for interconnected storage and virtual servers, and for interconnected fabrics, such as virtual switches and routers.

virtual server template

  1. A set of definitions that provides configuration defaults for z/VM virtual servers. z/VM Center uses virtual server templates to create z/VM virtual servers.
  2. The template on which a virtual server is based. The virtual server is allocated using the hardware requirements of the template.

virtual service processor (VSP)
The firmware that controls the powering on and powering off of a logical partition, including loading the firmware that controls the I/O slots and initializing the memory space of the logical partition.

Virtual Shared Disk
See IBM Virtual Shared Disk.

virtual storage (VS)
The storage space that can be regarded as addressable main storage by the user of a computer system in which virtual addresses are mapped to real addresses. The size of virtual storage is limited by the addressing scheme of the computer system and by the amount of available auxiliary storage, not by the actual number of main storage locations.

Virtual Storage Access Method (VSAM)
An access method for direct or sequential processing of fixed-length and variable-length records on disk devices. The records in a VSAM data set or file can be organized in logical sequence by a key field (key sequence), in the physical sequence in which they are written on the data set or file (entry sequence), or by relative-record number.

virtual storage area network (VSAN)
A fabric within the storage area network (SAN).

Virtual Storage Extended (VSE)
A system that consists of a basic operating system (VSE/Advanced Functions), and any IBM supplied and user-written programs required to meet the data processing needs of a user. VSE and the hardware that it controls form a complete computing system. Its current version is called VSE/ESA.

Virtual Storage Extended/Advanced Functions (VSE/Advanced Functions, VSE/AF)
The basic operating system support needed for a VSE-controlled installation.

Virtual Storage Extended/Enterprise Systems Architecture (VSE/ESA)
The VSE operating system operating in an ESA environment. ESA is an extension to the System/370 architecture and includes an advanced addressability feature that provides access registers.

Virtual Storage Extended/System Product (VSE/SP)
A licensed program providing VSE operating system support.

Virtual Storage Option (VSO)
An option for data entry database (DEDB) areas that maps an area into a data space or a coupling facility structure when the area is opened. The share level of the database determines which is used. Any VSO area control interval (CI) or coupling facility structure that has been loaded into a data space is subsequently read from the data space or coupling facility structure rather than from DASD.

virtual synchrony (VS)
A property of group communication that guarantees how messages are delivered when the view changes, for example, when existing members fail or new members join.

virtual system

  1. A deployment of a flexible set of middleware and resources that is used to define editable application environments. Virtual systems are created with customized topologies and offer more control than virtual applications by allowing users to configure middleware and tune OS settings. See also virtual application, virtual system pattern.
  2. A collection of virtual machines.

virtual system instance
The virtual environment that runs on a hypervisor in the cloud.

virtual system pattern
One or more middleware-centric virtual images, which can include script packages, that implement a deployment topology. A virtual system pattern is a shared topology definition used for repeatable deployment. See also pattern, virtual application pattern, virtual system.

virtual table

  1. A table or view where the rows are derived as they are required in memory.
  2. A table created to access data in an external file, external DBMS, smart large object, or in the result set of an iterator function in a query. The database server does not manage external data or directly manipulate data within a smart large object. The Virtual-Table Interface allows users to access the external data in a virtual table using SQL DML statements and join the external data with Informix table data.

Virtual Tape Server (VTS)
An enterprise virtual tape system that combines high-speed disk access with low-cost tape storage by virtualizing data in a disk cache buffer. Storage management routines efficiently utilize tape cartridge capacity which reduces the number of required tape cartridges.

Virtual Telecommunications Access Method (VTAM)
An IBM licensed program that controls communication and the flow of data in an SNA network.

virtual terminal
A system object, created and controlled by an application program, that provides a functional representation or simulation of a physical display station.

virtual terminal manager (VTM)
A Vertical Licensed Internal Code component that provides an interface to handle input/output to virtual devices on the system.

virtual terminal manager/function manager (VTM/FM)
The function that provides an application program interface to terminal handling components residing below the machine interface on the system.

Virtual Trusted Platform Module (VTPM)

  1. A software implementation of the Trusted Platform Module specification that is described by the Trusted Computing Group. The Trusted Platform Module is implemented as a physical chip on systems.
  2. A software implementation of the Trusted Platform Module specification that is described by the Trusted Computing Group. The PowerSC Trusted Boot feature provides virtual TPM functions for virtual machines running the AIX operating system with the PowerVM hypervisor on Power Systems servers.

virtual volume

  1. An archive file on a target server that represents a sequential media volume to a source server.
  2. A tape volume that resides in a tape volume cache of a virtual tape server (VTS). Whether the volume resides in the tape volume cache as a virtual volume or on a stacked volume as a logical volume (LVOL) is transparent to the host.

virtual workstation controller
A work station controller description that has the characteristics of a locally attached work station controller but does not exist as hardware.

A program that can change other programs to include a copy of itself. The other programs are then said to be infected by the virus. Additionally, the virus can perform other operations that can take up system resources or destroy data.


  1. In architecture, the property of a segment that declares whether the part of a picture defined by the segment is to be displayed or not displayed during the drawing process.
  2. In a user interface, the property of a control that declares whether the control is to be displayed or not displayed during run time.

visibility service
A type of business service that monitors and displays the performance, behavior, or metrics of a business process.

visible data partition
A data partition whose data is available to SQL statements. See also attached data partition, detached data partition.

visible identifier
An identifier that is within the scope of the current program or function.

visible scan
A scan whose scan sharing state can be read by other sharing scans. The other scans can use the state information to perform scan throttling and to form scan groups.

vision system
An intelligent pattern-recognition system that consists of a camera and lamps mounted on the gripper assemblies, the vision system controller, and the vision monitor. The vision system scans the external labels on cartridges to provide positive cartridge identification.

The pickup or delivery of a shipment at a site by a vehicle. See also route ID, stop.

Any individual, bot, or other program that is connecting to a web application via HTTP.

Visitor Internet
See Internet Connect.

The process of tracking unique visitors across single or multiple visits to a web application. Using Tealeaf technologies, each visitor to a web application can be uniquely and permanently identified, which assists in longer-term study of customer experience and issues.

Visual Basic (VB)
An event-driven programming language and integrated development environment (IDE) from Microsoft.

visual bean
A component that is visible to a user of the graphical user interface of a Java application.

visual data stream (VDS)
In bidirectional text representation, a stream of data that is organized in the sequence in which the data is presented on the screen. See also logical data stream.

visual designer
An individual who is skilled in UI design, application development, visual aesthetics, architectural structure of information, and has the ability to develop and formulate visual language metaphors for users to better understand a concept, task, procedure, or product.

Visual Explain
A tool that lets database administrators and application programmers use a graphical interface to display and analyze detailed information on the access plan of a given SQL or XQuery statement. The tasks provided by this tool can be accessed from the Control Center.


  1. An association between a Scalable Vector Graphics (SVG) diagram and the set of actions that describe how the diagram should be updated based on the values of metrics or key performance indicators (KPIs).
  2. A graph, chart, plot, table, map, or any other visual representation of data. A single visualization might also contain multiple graphs, charts, plots, and so on.

visualization bundle
A compressed file that contains information required for report authors to add an extensible visualization to reports.

visualization library
A collection of extensible visualizations that are imported into IBM Cognos Administration for use in Cognos Analytics - Reporting and other analytics components.

Visualization Markup Language (ViZml)
An extensible markup language (XML) for defining a visualization specification. Like GPL, it is grammar based, but it is more verbose and comprehensive than GPL.

visualization pane
A pane that provides a graphical visualization of an object in the tree pane.

visualization stylesheet
A specification that defines individual styles that can be applied to a visualization.

visualization template
A specification that defines the structure of a visualization and the variables/fields required to construct the visualization. It is effectively a visualization type.

The graphical user interface that analysts use to research alerts, view relationships, search for entities, load data, and run reports.

The graphical user interface that analysts use to research alerts, view relationships, search for entities, load data, and run reports.

visual monitoring
An icon-based method for monitoring a cluster.

visual ordering scheme
A mechanism for storing text in exactly the same order as it is displayed.

visual snippet
A diagrammatic representation of a fragment of Java programming language that can be manipulated with the visual snippet editor.

See VTAM internal trace.

vital product data (VDP, VPD)
Information that uniquely defines system, hardware, software, and microcode elements of a processing system.

vital record
An essential business record needed to meet operational responsibilities.

vital record group
In DFSMSrmm, a set of data sets with the same name that matches one vital-record specification.

vital record processing
The process of inventory management that determines which data sets and volumes DFSMSrmm should retain and whether a volume should be moved. These volumes and data sets have been assigned a vital record specification. See also inventory management, storage-location management processing.

vital records
A data set or volume maintained to meet an externally-imposed retention requirement, such as a legal requirement. Compare with disaster recovery. See also disaster recovery.

vital record specification (VRS)
In DFSMSrmm, policies defined to manage the retention and movement of data sets and volumes for disaster recovery and vital records purposes. See also primary vital-record specification, secondary vital-record specification.

vital-record specification-management value
In DFSMSrmm, a name with 1 - 8 characters that is defined by the installation and is used to assign management and retention values to tape data sets.

See Visualization Markup Language.

See virtual local area network.

VLAN tagging
The process of adding a VLAN number to the Ethernet packet to logically segment a physical network, thereby restricting the network layer 2 connectivity to the members who belong to the same VLAN.

See virtual lookaside facility.

See Vertical Licensed Internal Code.

VLIC log
A list of problem analysis information created by Vertical Licensed Internal Code.

See virtual logical unit number.

See variable-length variable blocked.

See virtual machine.

A type of operating system used on a System/370 computer.

See virtual machine disk.

VM/MVS bridge
A function of the Communications Utilities for i5/OS licensed program that provides distribution services between an i5/OS SNADS network and both a VM Remote Spooling Communications Subsystem (RSCS) network and a Multiple Virtual Storage/Job Entry Subsystem (MVS/JES) network.


  1. See Voice Message Service.
  2. See video management system.
  3. See variable message sign.

See Virtual Machine/System Product.

See Virtual Machine/System Product High Performance Option.

A commercially available, proprietary virtualization environment for System x and similar platforms.

See Virtual Machine/Extended Architecture.

See Virtual Network Computing.

See virtual node.

See virtual inode.

See virtual origin.

See versioned object base.

VOB database
The part of a versioned object base (VOB) storage directory in which metadata and VOB objects are stored.

VOB family
The set of replicas of a particular versioned object base (VOB).

See voice of the customer.


  1. A list of words with which DirectTalk matches input spoken by a caller.
  2. A repository for storing reusable business elements, such as terms, business item definitions, roles, messages, and errors, that are used in a business process.
  3. The set of terms and phrases that are used for rule editing.

See video-on-demand.

voice application
A DirectTalk application that answers or makes calls, plays recorded voice segments to callers, and responds to the caller's input.

voice directory
A list of voice segments identified by a group ID. Voice directories can be referenced by prompts and state tables. See also voice table.

voice-grade telephone line
A telephone line that is normally used for voice communications. The line requires a modem for data communications.

voice input
The response to the voice prompts given by a warehouse user.

voice instance
A server that hosts a third-party voice application. Multiple instances can be defined for a voice application.

A phone feature that allows callers to leave messages on an answering machine that is not local to the actual phone, but is instead a service provided by the service provider.

voice mailbox
The notional hard disk space where the incoming messages for a voice mail subscriber are stored.

voice message
In voice mail, a recording made by a caller for later retrieval by a subscriber. See also greeting.

Voice Message Service (VMS)
An Ericsson service that transmits information between DirectTalk and certain switches.

voice messaging
The capability to record, play back, distribute, route, and manage voice recordings of telephone calls through the use of a processor, without the intervention of agents other than the callers and the message recipients.

voice model
A file containing parametric information about the sounds of the language that are to be recognized on behalf of an application. In WebSphere Voice Server this is a bnf file.

voice of the customer (VOC)
The process and technologies involved in capturing a customer's expectations, feedback, and experiences.

Voice over Internet Protocol (VoIP)
A set of rules for routing two-way voice conversations over an IP-based network such as the Internet.

voice picking
Picking activity in a warehouse, where a warehouse user receives voice instructions through a head set, and confirms the action back vocally.

voice port library
A library that manages a socket connection from the client to the voice technology. The library uses entry points provided by DVT.

Voice Protocol for Internet Messaging (VPIM)
Standard for digital exchange of voice messages between different voice mail systems, as defined in Internet Request For Comments (RFC) 1911.

voice response unit (VRU)

  1. A telephony device that uses prerecorded voice responses to provide information in response to dual-tone multifrequency (DTMF) or voice input from a telephone caller.
  2. Hardware and software used to answer incoming calls by playing one or more prerecorded messages.

voice segment
The spoken words or sounds that comprise recorded voice prompts. Each segment in an application is identified by a group ID and a segment ID and usually includes accompanying text.

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

voice table
A grouping of voice segments used for organizational purposes. Voice tables can be referenced by prompts, but not by state tables. See also voice directory.

voice workflow
The flow of activities and voice-based dialogs that represent a desired warehouse operation.

VoiceXtensible Markup Language. An XML-based markup language for creating distributed voice applications. Refer to the VoiceXML forum web site at www.voicexml.org

void function
A function that does not return a value.

See Voice over Internet Protocol.

volatile attribute
An attribute of a data object that indicates the object is changeable. Any expression referring to a volatile object is evaluated immediately (for example, assignments).

volatile register
In a C language program, a storage area whose entry value does not need to be preserved when the called routine returns.

volatile table
A table whose cardinality can vary significantly over relatively short periods of time. Compared to statistics that are collected for non-volatile tables, statistics that are collected for volatile tables are less likely to represent the actual data in the tables. The optimizer takes this situation into account when determining access plans involving a volatile table.

See volume serial number.

voltage regulator module (VRM)
A replaceable module on a system board that regulates voltage to the microprocessor.


  1. A discrete unit of storage on disk, tape or other data recording medium that supports some form of identifier and parameter list, such as a volume label or input/output control. See also scratch volume, server storage, storage pool, storage pool volume, unassociated volume.
  2. The number of units sold for a particular SKU.
  3. A logical subdivision of a record folder into smaller and more easily managed units. A volume has no existence independent of the folder.
  4. The representation of an Small Computer System Interface (SCSI) disk that is presented to a host system. See also thin provisioning.
  5. A fixed amount of physical or virtual storage on a data storage medium.

volume access set
The set of I/O groups that allows host access to a volume. This set can optionally include the caching I/O group.

volume attribute
An attributes of a volume in a tape library, such as volume category, type of volume, or assigned-policy construct name.

volume catalog
An integrated catalog facility (ICF) user catalog containing the volume and library entries associated with tape libraries.

volume cloning
The process of creating a snapshot from a volume.

volume contract
See blanket contract.

volume copy
A physical copy of the data that is stored on a volume. Mirrored volumes have two such copies. Nonmirrored volumes have one copy.

volume difference
The difference between the initial and the optimal volume or predicted number of units sold.

volume discount bid
A bid that is provided by suppliers and contains a discount in price if the buyer procures a large quantity of items.

volume expiration date
The date the volume should expire based on the highest expiration date of the data sets that reside on the volume.

volume full threshold
A value that indicates when a volume should be marked as full. This threshold specifies a number of free KB for the volume; when the number falls below this threshold, the volume is marked full.

volume group (VG)
A collection of 1 to 32 physical volumes (read-write, hard disk drives) of varying size and type that can be used to allocate space to one or more logical volumes.

volume header record
The record in the DFSMSdss dump tape that identifies and contains data pertinent to the entire volume, and identifies the type of operation that created a dump.

volume history file
A file that contains information about volumes that have been used by the server for database backups and for export of administrator, node, policy, or server data. The file also has information about sequential-access storage pool volumes that have been added, reused, or deleted. The information is a copy of volume information that is recorded in the server database.

volume label
An area on tape or disk that is used to identify the tape volume and its owner.

volume mount analyzer
A program that assists in the analysis of the current tape environment, allowing identification of the most desirable data sets for redirection to the direct access storage device (DASD) buffer for management using storage management subsystem (SMS) facilities.

Volume of Files over Time widget
A widget that provides a snapshot view of the volume of file transfers for each monitored server a user has permission to view over time.

volume of measure
The size of the SKU in absolute terms.

volume percent change
The difference between the initial and the optimal volume or predicted number of units sold in terms of percentage.

volume pool
In DFSMShsm, a set of related primary volumes.

volume positioning
Rotating the tape reel or cartridge so that the read/write head is at a particular point on the tape.

volume record
A record containing information related to a volume, such as volume serial number (VOLSER), library name, and storage group. The volume record resides within the tape configuration database (TCDB).

volume rule
A constraint imposed on products within a given volume range.

volume serial number (VOLSER)
An identification number in a volume label that is assigned when a volume is prepared for use on the system.

volume set
See consistency group.

Volume Shadow Copy Service (VSS)
A set of Microsoft application-programming interfaces (APIs) that are used to create shadow copy backups of volumes, exact copies of files, including all open files, and so on.

volume statistics
Statistical information about the activity on a tape, diskette, or cartridge volume including statistics about the session (such as the number of read, write, and retry operations), and lifetime (accumulated) statistics (such as the number of read and write errors and the number of bytes read and written).

volume status
In the storage management subsystem (SMS), an indicator of the availability of a volume for system management: the volume is not ready for system management because it contains data sets that are ineligible for system management; the volume is ready for system management because all of the data sets on a volume have an associated storage class and are cataloged in an integrated catalog facility (ICF) catalog; the volume will not be managed by the system because it contains no system-managed data sets and has not been initialized as system-managed. See also physical volume status.

volume table of contents (VTOC)

  1. A table on a direct access volume that describes the location, size and other characteristics of each data set on the volume. Each entry is a data set control block (DSCB).
  2. An area on a disk or diskette that describes the location, size, and other characteristics of each file, library, and folder on the disk or diskette.

volume tendering
A tendering process that allows a shipper to establish volume commitments with carriers and then rank the carriers according to need.

volume trailer record
The record in the DFSMSdss dump tape that identifies the end of the data for a direct access storage device (DASD) volume.

volume type
A unique identifier of the type of volume. For example, tape volume types include physical, logical, stacked logical, imported logical, and exported logical volumes (LVOLs).

Voluntary Inter-industry Communication Standards (VICS)
A standards-setting body for the retail industry. VICS is a subset of ANSI X12.

volunteer computing
An arrangement whereby people contribute computing resources to a larger project.

Voronoi cell
A region on the surface of the Earth that has boundaries with neighboring regions. The boundaries are defined by the geodesic distances between the center point of the Voronoi cell and the center points of its neighbors. A Voronoi cell consists of all points that are closer to the center of the Voronoi cell than to the center of any other Voronoi cell.

Voronoi cell structure
A subdivision of the surface of the Earth into cells where every point within a particular cell is closer to the center point of that cell than to the center point of any other cell.

In the two-phase commit protocol, the response of an agent to the request of the initiator. The application transaction program uses the responses to determine if it should commit or roll back its protected resources.

voted read-only (VRO)
The voted read-only logical unit of work (LUW) state indicates that the current LUW had no pending changes, was allowed to vote read-only, and did so.

vote read-only
The response, to a Prepare presentation services header with a Forget presentation services header, by the agent when no changes have been made to the resources, for the optimization of the two-phase commit flows.


  1. A summary of charges for a shipment, such as linehaul rate, and any planned or unplanned accessorials.
  2. A printed piece of paper or an equivalent digital version of that paper used to pay for goods or services.

See valid printable area.

A component consisting of a base card, which connects to the digital trunk adapter in the RS/6000, and a trunk interface card (TIC), which manages the trunk connection to the switch. The single digital trunk processor contains one VPACK, and the multiple digital trunk processor contains slots for up to five VPACKs. See also SPACK, XPACK.

VPATH device
See data path device.

See virtual path connection.

See vital product data.

See virtual path identifier.

See Voice Protocol for Internet Messaging.

See virtual private network.

V process model
A visual representation of the systems development lifecycle as a modified waterfall methodology, with the phases arrayed across a V shape to correlate development with testing.

See virtual route.

See virtual route identifier.

See voltage regulator module.

See virtual routing node.

See voted read-only.

VR pacing
See virtual route pacing.

See virtual route pacing response.

See vital record specification.

See voice response unit.


  1. See virtual synchrony.
  2. See virtual storage.

See Virtual Storage Access Method.

VSAM catalog
A special key-sequenced data set (KSDS) with an index containing extensive data set and volume information that the Virtual Storage Access Method (VSAM) requires to locate data sets or files, allocate and deallocate storage space, verify the authorization of a program or operator to gain access to a file, and accumulate usage statistics for data sets or files. VSAM catalogs have been functionally replaced by integrated catalog facility (ICF) catalogs. VSAM catalogs are not supported by z/OS.

VSAM record-level sharing (VSAM RLS)
An extension to the Virtual Storage Access Method (VSAM) that provides direct record-level sharing of VSAM data sets from multiple address spaces across multiple systems. Record-level sharing uses the z/OS Coupling Facility (CF) to provide cross-system locking, local buffer invalidation, and cross-system data caching. Contrast with global shared resources and local shared resources. See also global shared resource, local shared resource, SMSVSAM.

See VSAM record-level sharing.

VSAM shared information (VSI)
Blocks that are used for cross-system sharing.

VSAM sphere
The base cluster of a Virtual Storage Access Method (VSAM) data set and its associated alternate indexes.

VSAM volume control record (VVCR)
The first logical record in the VSAM volume data set (VVDS) that contains information to manage direct access storage device (DASD) space and the basic catalog structure (BCS) back pointers.

VSAM volume data set (VVDS)
A data set that describes the characteristics of the Virtual Storage Access Method (VSAM) and system-managed data sets residing on a given direct access storage device (DASD) volume. A VVDS is part of an integrated catalog facility (ICF) catalog. See also basic catalog structure, integrated catalog facility catalog.

VSAM volume record (VVR)
A Virtual Storage Access Method (VSAM) logical record within a VSAM volume data set (VVDS).

VSAM work area (VSWA)
An area that is acquired dynamically by the file control program when accessing a VSAM data set.

See virtual storage area network.

See virtual SCSI.

See Virtual Storage Extended.

VSE/Advanced Functions
See Virtual Storage Extended/Advanced Functions.

See Virtual Storage Extended/Advanced Functions.

See Virtual Storage Extended/Enterprise Systems Architecture.

An IBM licensed program primarily used to spool input and output. The networking functions of the program enable a VSE system to exchange files with or run jobs on another remote processor.

V-Series Recommendations
A document, CCITT Recommendation V-Series, that outlines standards for the interface between data terminal equipment (DTE) and a synchronous modem.

See Virtual Storage Extended/System Product.

See VSAM shared information.

See virtual server network.

See Virtual Storage Option.

See virtual service processor.

vSphere Storage APIs for Storage Awareness (VASA)
A set of APIs that permits storage arrays to integrate with vCenter for management functionality.


  1. See Volume Shadow Copy Service.
  2. See vector symbol set.

VSS Backup
A backup operation that uses Microsoft Volume Shadow Copy Service (VSS) technology. The backup operation produces an online snapshot (point-in-time consistent copy). This copy can be stored on local shadow volumes or on server storage.

VSS Fast Restore
An operation that restores data from a local snapshot. The snapshot is the VSS backup that resides on a local shadow volume. The restore operation retrieves the data by using a file-level copy method.

VSS Instant Restore
An operation that restores data from a local snapshot. The snapshot is the VSS backup that resides on a local shadow volume. The restore operation retrieves the data by using a hardware assisted restore method (for example, a FlashCopy operation).

VSS offloaded backup
A backup operation that uses a Microsoft Volume Shadow Copy Service (VSS) hardware provider (installed on an alternate system) to move data to the server. This type of backup operation shifts the backup load from the production system to another system.

VSS Restore
A function that uses a Microsoft Volume Shadow Copy Service (VSS) software provider to restore snapshots that reside on server storage. The snapshots were created by a VSS Backup and are restored to their original location.

See VSAM work area.

A character-mode work station. Characters are sent immediately to the host system when a key is pressed.

VT100 workstation protocol
i5/OS support for the VT100 work station protocol that allows a user to access, using TELNET VT100 client support, VT100 application programs on other systems in a TCP/IP network. Users on other systems with a TELNET VT100 client emulation package are able to access i5/OS application programs through the i5/OS TELNET VT100 server.

A character-mode work station. Characters are sent immediately to the host system when a key is pressed.

VT220 workstation
An ASCII full-screen workstation manufactured by Digital Equipment Corporation (DEC).

VT220 workstation protocol
i5/OS support for the VT220 work station protocol that allows a user to access, using TELNET VT220 client support, VT220 application programs on other systems in a TCP/IP network. Users on other systems with a TELNET VT220 client emulation package are able to access i5/OS application programs through the i5/OS TELNET VT220 server.

See Virtual Telecommunications Access Method.

VTAM application name
The name an installation gives to a subsystem to identify it to VTAM.

VTAM application program
A program that has opened an access method control block (ACB) to identify itself to VTAM and that can therefore issue VTAM macroinstructions.

VTAM Common Network Services
A VTAM application program that supports shared connectivity between SNA networks and specific non-SNA networks.

VTAM definition
The process of defining the user application network to VTAM and modifying IBM-defined characteristics to suit the needs of the user.

VTAM definition library
The operating system files or data sets that contain the definition statements and start options filed during VTAM definition.

VTAM Generic Resources (VGR)
IMS VGR, together with VTAM V4R2, enable VTAM to automatically distribute terminal sessions among a cooperative set of IMS systems known as a generic resource group.

VTAM internal trace (VIT)
A trace that is used in VTAM to collect data on channel I/O, use of locks, and storage management services.

VTAM Terminal Block (VTCB)
An IMS control block that represents a VTAM terminal, both static and dynamic. The VTCB contains the following IMS control blocks and data areas: CLB, CTB, CRB, CIB, DDM work area, and CTT.

See VTAM Terminal Block.

See virtual terminal manager.

See virtual terminal manager/function manager.

See volume table of contents.

VTOC copy data set
A data set that contains a copy of the volume table of contents (VTOC) entry for each data set that DFSMShsm backs up or dumps.

VTOC index
The data set on which the location of the data-set volume table of contents (VTOC) entries is kept in an index for quick access by direct access device space management (DADSM).

See Virtual Trusted Platform Module.

See Virtual Tape Server.

V-type constant (V-con)
A constant that contains an address.

See value unit.

See value unit exhibit.

A security exposure in an operating system, system software, or application software component.

vulnerability analysis cache
A cache of vulnerabilities found during a scan of source code that can be used for subsequent scans to reduce scan time.

VU table
See value unit exhibit.

See VSAM volume control record.

See VSAM volume data set.

See virtual volume.

See VSAM volume record.

See variable workload license charge.