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

◄ BACK NEXT ►

AA D
See designated approving authority.

DAD
See document access definition.

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

DADX
See document access definition extension.

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

DADX run-time
In a DADX Web service, the period of time during which SOAP requests are sent to the new Web service. The DADX run-time environment provides information to the DADX Web service, including the HTTP GET and POST bindings, the test page, WSDL generation, and the translation of DTD data into XML schema data.

DAE
See dump analysis and elimination.
daemon
(1) A system process that provides a specific service to applications or users.
(2) A program that runs unattended to perform continuous or periodic functions, such as network control.

DAF
See destination address field.

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

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

DAP
See directory access protocol.

DARPA
See Defense Advanced Research Projects Agency.

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

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

data aggregate
A group of data elements that describe a particular entity.

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

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

data availability
An IMS enhancement available with DBCTL. It allows PSB scheduling to complete successfully even if some of the full-function databases it requires are not available.

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

database (DB)
(1) In Notes/Domino, a collection of documents and their forms, views, and folders, stored under one name. Notes databases can be part of a Web site or part of a Notes application.
(2) A collection of interrelated or independent data items that are stored together to serve one or more applications.

database access thread
In DB2 Universal Database for z/OS and OS/390, a thread that accesses data at the local subsystem on behalf of a remote subsystem. See also allied thread.

database administrator (DBA)
(1) A person who is responsible for the design, development, operation, security, maintenance, and use of a database.
(2) A DB2 UDB user with DBADM authority.

database agent
A representation for the physical process or thread that will do the actual work inside the database engine.

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

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

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

database catalog
(1) In the Data Warehouse Center, a collection of tables that contains descriptions of database objects such as tables, views, and indexes. See also system catalog.
(2) A database containing information about databases stored on a single Domino server, a group of servers, or all the servers in a domain. Database Catalogs are commonly used to let users add the databases in them to the user's desktop.

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

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

database connection services directory (DCS directory)
A directory that contains entries for remote host databases and the corresponding application requester used to access them.

Database Control (DBCTL)
An interface between CICS Transaction Server and IMS/ESA that allows access to IMS DL/I full-function databases and to data entry databases (DEDBs) from one or more CICS systems without the need for data sharing. It also provides release independence, virtual storage constraint relief, operational flexibility, and failure isolation.

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

database descriptor (DBD)
An internal representation of a DB2 Universal Database for z/OS and OS/390 database definition, which reflects the data definition that is in the DB2 Universal Database for z/OS and OS/390 catalog. The objects that are defined in a database descriptor are table spaces, tables, indexes, index spaces, and relationships.

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

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

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

database function
The relationship between a set of input data and a set of result values. See also built-in function, user-defined function.

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

database ID
See database identifier.

database identifier (database ID)
The time stamp that is located in the Notes database header and that indicates when a Notes database was first created or when the Fixup task last ran on it.

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

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

database-level sharing
A kind of data sharing that enables application programs in one IMS subsystem to read data while another program in another IMS subsystem reads from the same database or updates it. In IMS data sharing, a CCS system can be an IMS subsystem. See also block-level sharing.

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

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

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

database management system (DBMS)
See database manager.

database manager
A person with Manager access to a Notes database, whose responsibilities include setting up and maintaining access to the database and monitoring database replication, usage, and size.

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

database manager instance
(1) A logical database manager environment similar to an image of the actual database manager environment. It is possible to have several instances of the database manager product on the same workstation. Use these instances to separate the development environment from the production environment, tune the database manager to a particular environment, and protect sensitive information.
(2) The DB2 code that manages data. An instance has its own databases (which other instances cannot access), and all its database partitions share the same system directories. It also has separate security from other instances on the same computer.

database name
The identifying name that a user provides as part of the CREATE DATABASE command or application programming interface. A database name must be unique within the location in which it is cataloged.

database node
See database partition. See also partitioned database, database partition group.

database object
(1) One of many objects that comprise an installation of DB2 Universal Database, including the instance and the databases, database partition groups, buffer pools, tables, and indexes within the instances.
(2) An object that a user creates in the database, such as a procedure, trigger, or any other object that can be created by issuing a CREATE statement.

database object hierarchy
An arrangement of database objects into parent/child relationships. For example, a database is the child of its database instance parent.

database organization
The physical arrangement of related data on a storage device. DL/I database organizations are hierarchical direct (HD) and hierarchical sequential (HS).

database partition
In a partitioned database environment, a part of the database that consists of its own user data, indexes, configuration file, and transaction logs. See also partitioned database, database partition group.

database partition group
In a partitioned database environment, a named set of one or more database partitions. This term replaces the term nodegroup. See also database partition.

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

database record
In a DL/I, IMS or SQL/DS database, a collection of segments that contains one occurrence of the root segment type and all of its dependents arranged in a hierarchical sequence. It may be smaller than, equal to, or larger than the access method logical record.

database recovery
The function of restoring the user data sets, starting with a backup copy and applying all changes made to each data set after the backup was taken.

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

database recovery log
A set of primary and secondary log files that are used in replication to record all changes to a
database in log records.

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

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

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

database request module (DBRM)
A data set member that is created by the DB2 Universal Database for z/OS and OS/390 precompiler and that contains information about SQL statements. DBRMs are used in the bind process.

database resource adapter (DRA)
Component of the CICS-DBCTL interface in the CICS address space. Its functions include requesting connection and disconnection from DBCTL, telling CICS when a shutdown of DBCTL has been requested or if DBCTL has failed, managing threads, establishing contact with the DBCTL address space, and loading the DRA startup parameter table.

database server
In a client-server environment, a stand-alone workstation in a local area network on which the database manager is installed, allowing client workstations that run applications to access the database remotely. In the DB2 Universal Database environment, the database server function is provided by the distributed data facility to access DB2 Universal Database data from local applications or a remote database server that is acting as an intermediate database server.

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

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

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

data bean
A type of Java bean that is placed into a JSP file. The data bean represents data that is accessible by the Store Developer. Data beans can have associated commands that are invoked when the JSP instantiates the data bean at run time.

data bean command
A command associated with a data bean, and called by a JSP file. This command retrieves data for the data bean from a persistent object, such as an entity bean.

data bean manager
A module that invokes a data bean command to fetch data from corresponding entity beans.

data blocking
In SQL replication, the process of replicating a specific number of minutes' worth of change data during an Apply cycle.

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

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

data chaining (DC)
The process of using information from one data source or location to access another data source or location.

data character set
See character set.

data circuit-terminating equipment (DCE)
The equipment that provides signal conversion and coding between the data terminal equipment (DTE) and the line. The DCE provides all the functions required to establish, maintain, and end a connection. A DCE may be either separate equipment or an integral part of the DTE or of the intermediate equipment. A DCE may perform other functions that are usually performed at the network end of the line.

data class
An access bean that provides data storage and access methods for caching enterprise bean properties. Unlike copy helpers, data class access beans work with enterprise beans that have local client views as well as remote client views.

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

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

data collection
The process of obtaining performance and availability monitoring data and providing that data to a metric evaluator. Examples of data collectors include DNS probes, Web page analyzers, or database analyzers. See also metric evaluation.

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

data communication equipment (DCE)
A device that establishes, maintains and terminates a session on a network. It may also convert signals for transmission. It is typically the modem.

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

data connection resource (DCR)
A design element you can use to define a connection between a Notes form and an enterprise database for exchanging data.

data consolidation
A replication configuration that contains one read-only target database. The target table contains rows of data from one or more source databases.

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

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

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

data conversion interface (DCI)
TheWebSphere MQ interface to which customer- or vendor-written programs that convert application data between different machine encodings and CCSIDs must conform. A part of the WebSphere MQ Framework.

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

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

data currency
In DB2 Universal Database for z/OS and OS/390, the state in which data that is retrieved into a host variable in a program is a copy of data in the base table.

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

data definition (DD)
(1) In IDDU, information that describes the contents and characteristics of a field, record, or file.
(2) A data object that defines a database or table.
(3) In the C and C++ languages, a definition that describes a data object, reserves storage for a data object, and can provide an initial value for a data object. A data definition appears outside a function or at the beginning of a block statement. IBM.

data definition language (DDL)
A language for describing data and its relationships in a database. See also data manipulation language.

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

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

data description language
See data definition language. See also data manipulation language.

data description specifications (DDS)
A description of the user's database or device files that is entered into the system in a fixed form. The description is then used to create files.

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

data dictionary
(1) In IDDU, an object for storing field, record format, and file definitions. The system-recognized identifier for the object type is *DTADCT.
(2) A repository of information about an organization's application programs, databases, logical data models, users, and authorizations. A data dictionary can be manual or automated.

data directory
A directory that contains local Notes databases, local database templates, country language services (CLS) files, DESKTOP.DSK files, and if a user is using UNIX, the NOTES.INI file.

data distribution replication
In replication, a configuration that contains a single source table, from which changes are replicated to one or more read-only target tables. Before replication to the target tables can occur, the tables must contain a complete set of data from the source table.

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

data dump
In COBOL, the contents of the data areas used by a program that has failed.
data element
(1) The smallest unit of data that can be referred to.
(2) See monitor element. See also logical data group.
(3) A unit of data that, in certain context, is considered indivisible. For example, the data element "age of a person" with values consisting of all three-decimal digit combinations.

data element separation
A delimiter sequence that defines how a TDS message is to be parsed. The following separation types are supported: data pattern separation, delimited separation, fixed length separation, and tagged separation.

data-encrypting key
In Cryptographic Support, a key used to encrypt data that is not a cryptographic key. Used with the CPHDTA and GENMAC commands.

Data Encryption Algorithm (DEA)
In Cryptographic Support, equivalent to the Data Encryption Standard. Adopted by the American National Standards Institute in 1981.

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

data entry database (DEDB)
A direct-access database that consists of one or more areas, with each area containing both root segments and dependent segments. The database is accessed using VSAM media manager.

Data Facility Hierarchical Storage Management System (DFHSM)
A DASD management tool for automatically managing low-activity and inactive data in DFSMS and non-DFSMS environments.

data file
(1) A group of related data records organized in a specific order. A data file can be created by the specification of FILETYPE(*DATA) on the create commands. See also command file, source file.
(2) In RJE, a remote job input stream that can contain host system commands and job control language as well as data.

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

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

data format
See MIME type.

datagram
A form of asynchronous messaging in which an application sends a message, but does not require a response.

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

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

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

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

data independence
In CICS, the ability to request data by a high-level data-management method without concern as to how the data is stored or retrieved.

data integrity
(1) The condition that exists as long as accidental or intentional destruction, alteration, or loss of data does not occur.
(2) Within the scope of a unit of work, either all changes to the database management systems are completed or none of them are. The set of change operations are considered an integral set.
(3) The security service that detects whether there has been unauthorized modification of data, or tampering. The service detects only whether data has been modified; it does not restore data to its original state if it has been modified.

data interchange
(1) The use of data by systems of different manufacture.
(2) The sharing of data between applications. XML supports data interchange without needing to go through the process of first transforming data from a proprietary format.

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

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

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

Data Interfile Transfer, Testing and Operations utility (DITTO utility)
An IBM licensed program that provides file-to-file services for card I/O, tape, and disk devices.

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

data item part
In EGL, a data part that defines an area of memory that is not divisible.

DataJoiner
See DB2 Information Integrator. A separately available product that provides client applications integrated access to distributed data and provides a single database image of a heterogeneous environment. With DataJoiner, a client application can join data (using a single SQL statement) that is distributed across multiple database management systems or update a single remote data source as if the data were local.

DataJoiner Replication Administration tool (DJRA tool)
See DB2 Information Integrator.

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

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

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

DATALINK
An SQL data type that enables logical references from the database to a file stored outside the
database.

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

datalink
A field in a database file that contains a link to an object. The link is in the form of a uniform resource locator (URL).
data link connection identifier (DLCI)
The field in a Q.922 frame that is used for frame relay routing. Each DLCI identifies a frame relay virtual circuit.

data link control (DLC)
(1) In SNA, the protocol layer that consists of the link stations that schedule data transfer over a link between two nodes and perform error control for the link.
(2) A set of rules used by nodes on a data link (such as an SDLC link or a token ring) to accomplish an orderly exchange of information.

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

data link control protocol (DLC)
The protocol layer used by nodes on a data link to accomplish an orderly exchange of information.
data link escape character (DLE, DLE character)
In binary synchronous communication (BSC), a transmission control character used to indicate that the next character is a control character, not a data character.

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

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

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

Data Link Reconcile Not Possible (DRNP)
The state of a DB2 table in which one or more DATALINK type columns contain file references whose integrity is violated (for example, as the result of restoring a database without the ability to restore the files that the database refers to).

Data Link Reconcile Pending (DRP)
The state of a DB2 table in which one or more DATALINK type columns contain file references whose integrity might be in doubt (for example, as the result of restoring a database without rolling forward through the database logs).

Data Links File Manager (DLFM)
A component of the DB2 Data Links Manager that enables a DB2 database to manage files that are outside of the database.

Data Links File System (DLFS)
A file system that is under the control of the Data Links Filesystem Filter (DLFF).

Data Links File System Filter (DLFF)
A DB2 Data Links Manager component. A file system filter program that enforces data integrity by ensuring valid and controlled access to linked files. See also linked file.

Data Links Manager Administrator
The person and the user ID that is responsible for administering the DB2 Data Links Manager and its associated environment. Sometimes also referred to as DLFM User, because when DB2 Data Links Manager is installed, an account with the default user ID of dlfm is set up for use by the
Data Links Manager Administrator. See also superuser.

Data Links server
A computer that contains these DB2 Data Links Manager components: a Data Links File Manager (DLFM), a Data Links Filesystem Filter (DLFF) controlling a Data Links File System (DLFS), and a DB2 database (used as the Logging Manager).

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

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

data manipulation language (DML)
A subset of SQL statements that is used to manipulate data. Most applications primarily use DML SQL statements, which are supported by the DB2 Connect program. SELECT, INSERT, UPDATE, and DELETE statements are similar across the IBM relational database products. See also data definition language, Structured Query Language.

data mapping
The process of changing characters from one form of representation to another, such as from zoned decimal to packed decimal.

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

data mart server
A machine that hosts one or more data marts. Multiple data mart servers can draw data from the same central data warehouse.

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

data migration
The movement of data when the software is upgraded or the data is transferred to a different hardware server or model.

data mining
The process of collecting critical business information from a data warehouse, correlating the information and uncovering associations, patterns, and trends.

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

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

data mover
A device that moves data on behalf of the server. A network-attached storage (NAS) file server is a data mover.

data multiplexer
See multiplexed device.

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

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

data note
A document in a Notes database.

data object
(1) An object that conveys information, such as text, graphics, audio, or video. See also machine object.
(2) Any object (such as tables, views, indexes, functions, triggers, and packages) that can be created or manipulated using SQL statements.
(3) A program variable that provides operational and possibly representational characteristics to byte strings in spaces.

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

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

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

data partition
In a z/OS or OS/390 environment, a VSAM data set that is contained within a partitioned table space.

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

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

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

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

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

data queue
An object that is used to communicate and store data used by several programs in a job or between jobs. The system-recognized identifier is *DTAQ.
Dataradio Multiplex Protocol (DMP)
The protocol that is used in a Dataradio network.

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

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

data repository
(1) A component of CICSPlex SM that provides methods for creating, accessing, updating, and deleting data in the CICSPlex SM data repository.
(2) For the purposes of Discovery Server, containers of data content, such as file systems, Web servers, document libraries, mail files, and Notes databases, that are processed by spiders appropriate to the type of container.

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

data server
A device on a local area network (LAN) that provides services, data, or facilities for other devices on the network.

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

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

data set
The major unit of data storage and retrieval, consisting of a collection of data in one of several prescribed arrangements and described by control information to which the system has access.

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

data set name block ( DSNB DSNAME block)
An area, addressed by a FCT entry, that represents a physical VSAM or BDAM (DAM in CICS/VSE) data set that is being accessed through one or more CICS files. A DSNAME block (DSNB) is created, if it does not already exist, when a file is opened or, in CICS Transaction Server only, when a SET FILE DSNAME command is executed.

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

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

data sharing
The ability of two or more DB2 Universal Database for z/OS and OS/390 subsystems to directly access and change a single set of data.

data-sharing component
In Sametime, the shared whiteboard or screen sharing.

data sharing group
A collection of one or more DB2 Universal Database for z/OS and OS/390 subsystems that directly access and change the same data while maintaining data integrity.

data sharing member
(1) In a federated system, typically a relational DBMS instance and one or more databases that are supported by that instance. A federated system can include other types of data sources, such as flat-file databases and table-structured files.
(2) A local or remote relational or nonrelational data manager that is capable of supporting data access using an ODBC driver that supports the ODBC APIs.

data source
(1) A repository of data to which a federated server can connect and then retrieve data by using wrappers. A data source can contain relational databases, XML files, search algorithms, table-structured files, or other objects. In a federated system, data sources appear as a single collective database. See also foreign server.
(2) The means by which an application accesses data from a database.
(3) In JDBC, an interface that provides a logical representation of a pool of connections to a physical data source. Data source objects provide application portability by making it unnecessary to supply information specific to a particular database driver.

data source object
In a federated system, an object at the data source on which you can perform operations. Examples include a database table, a database view, or a spreadsheet list. See also nickname.

data space
(1) In releases prior to DB2 Universal Database for z/OS and OS/390 Version 8, space ranging in size from 0 bytes to 2 gigabytes of contiguous virtual storage addresses that a program can
directly manipulate. Unlike an address space, a data space can hold only data; it does not contain common areas, system data, or programs.
(2) A range of up to two gigabytes of contiguous virtual storage addresses that a program can directly manipulate. Unlike an address space, a data space can hold only data; it does not contain common areas or system data or programs. See also address space.

data store
(1) The back end to the K-map, the data store is an index of information Discovery Server collects by spidering a specified set of data repositories, and then stores in DB2 tables.
(2) A place (such as a database system, file, or directory) where data is stored.

data stream
All information (data and control commands) sent over a data link usually in a single read or write operation. For example, a data stream is used to send displays and to receive displays from a workstation device.

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

data structure
(1) In OSI, the syntactic structure of symbolic expressions and their storage allocation characteristics. In OSI Communications Subsystem, data structures are created by the Abstract Syntax Checker.
(2) An area of storage that defines the layout of the fields, called subfields, within the area. A data structure is program described.

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

DataTAC
A technology for radio packet-data networks that was developed by Motorola.

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

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

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

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

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

data type
(1) The type of information that one field in a Notes database can store, for example, text, rich text, numbers, keywords, and time.
(2) An attribute used for defining data as either numeric or character.
(3) In programming languages, a set of values together with a set of permitted operations. A data type determines the kind of value that a variable can assume or that a function can return.
(4) In SQL, an attribute of columns, literals, host variables, special registers, and the results of functions and expressions.
(5) In OSI, a category of data clearly defined using a data declaration method, such as ASN.1 or Pascal.

data type mapping
In a federated system, the mapping of a data type used at a data source to a DB2 data type. For example, the Oracle type FLOAT maps by default to the DB2 type DOUBLE. DB2 supplies default mappings for most kinds of data types; the default mappings are in the wrappers.

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

data value
In Business Graphics Utility, a single, numeric data item entered as a value for a horizontal line or vertical line. See also data group.

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

Data Warehouse Center
The component of DB2 Universal Database that provides the graphical interface and the software behind it that enables you to work with the components of the warehouse. You can use the Data Warehouse Center to define and manage the warehouse data and the processes that create the data in the warehouse.

Data Warehouse Center administrative interface
The user interface to the administration functions of the Data Warehouse Center. The interface can be on the Data Warehouse Center server or on different machines for multiple administrators.

Data Warehouse Center program
A program, supplied with the Data Warehouse Center, that can be started from the Data Warehouse Center and that is automatically defined, for example, DB2 Load programs and transformers.

Data Warehouse Center property
An attribute that applies across sessions of the Data Warehouse Center, such as the warehouse control database that contains the technical metadata.

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

date
A three-part value that designates a day, month, and year. For example, YYYY-MM-DD.

date and time picker control (DTP)
A control that displays information about dates and times, and allows the user to modify this information.

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

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

dB
See decibel.

DB
See database.

DB2
A family of IBM licensed programs for relational database management.

DB2 AD Client
See DB2 Application Development Client.

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

DB2 Application Development Client (DB2 AD Client)
A collection of tools that help developers create database applications.

DB2 Call Level Interface
See call level interface. See also embedded SQL.

DB2 client
A client that determines the location of a remote database, manages the transmission of requests to the database server, and returns the results.

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

DB2 Connect
A product that enables client applications to read and update data that is stored on DB2 family servers.

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

DB2 Data Links Manager (DLM)
A separately orderable feature that enables applications to manipulate data that is stored in unstructured files and in the relational database management system (RDBMS). DB2 Data Links Manager enables DB2 Universal Database to manage unstructured files as if they are stored in the database and provides the integration between the RDBMS and the external file systems through extensions to DB2 Universal Database.

DB2 DataPropagator
A product that provides DB2 replication for OS/390, z/OS, OS/400, z/VM, VM, and VSE operating-system environments. For UNIX and Windows operating-system environments, replication is integrated with DB2 and does not require a separate license.

DB2DC
See Development Center.

DB2 Download Tool (DB2DT)
A tool that performs high-speed data transfers between an MVS and an SP system.

DB2DT
See DB2 Download Tool.

DB2 extender
A program that stores and retrieves data types other than the traditional numeric and character data, such as image, audio, and video data, and complex documents.

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

DB2 host
In a DB2 Data Links Manager configuration, a DB2 database, on a DB2 server, that contains a DATALINK column.

DB2I
In DB2 Universal Database for z/OS and OS/390, DB2 Interactive.

DB2I Kanji Feature
The tape that contains the panels and jobs that allow a site to display DB2I panels in Kanji.

DB2 Information Integrator
An IBM product that integrates diverse, distributed, and real-time data and that provides wrappers for accessing and integrating structured and unstructured data under a single API. DB2 Information Integrator replaces the DB2 Relational Connect, DB2 Life Sciences Data Connect, and DB2 DataJoiner products and tools.

DB2 Kanji Feature
In DB2 Universal Database for z/OS and OS/390, the tape that contains the panels and jobs that allow a site to display DB2I panels in Kanji.

DB2 .NET Data Provider
An extension of the ADO.NET interface that allows .NET applications to access a DB2 UDB database through a secure connection, run commands, and retrieve results.

DB2 Net Search Extender
A program that provides full-text retrieval through a DB2 stored procedure. The DB2 Net Search Extender is primarily optimized for performance. Using DB2 Net Search Extender can be particularly advantageous in applications where search performance on large indexes and scalability according to concurrent queries are important factors. DB2 Net Search Extender also provides powerful search features that are enhanced by additional rich linguistic functionality for applications with highly structured documents where the information need is complex, and the quality and precision of the search result are key issues over and above system response times.

DB2 notify log
See administration notification log. See also contact.
DB2 Performance Monitor for z/OS and OS/390 (DB2 PM)

DB2 PM
See DB2 Performance Monitor for z/OS and OS/390.

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

DB2 Spatial Extender
A DB2 UDB component that stores and manipulates spatial data. You use the DB2 Spatial Extender to generate and analyze spatial information about geographic features. See also geographic information system.

DB2 Text Extender
See DB2 Net Search Extender. Renamed to DB2 Net Search Extender and enhanced in DB2 Universal Database Version 8.

DB2 tools catalog
A set of tables or files that is maintained by the database tools (Data Warehouse Center, Control Center, Task Center, Information Catalog Center) and contains information about the processes and tasks that DB2 runs, such as loads, reorgs, database maintenance processes, data movement processes, and the associated schedules, logs, and dependencies.

DB2 tools metadata
The information about the processes and tasks that DB2 runs, such as loads, reorgs, database maintenance processes, data movement processes, and the associated schedules, logs, and dependencies. The DB2 tools metadata is contained in the DB2 tools catalog.

DB2 UDB for iSeries
See DB2 Universal Database for iSeries.

DB2 UDB Query Manager and SQL Development Kit
The IBM licensed program that is one of the DB2 UDB family of products. Query Manager allows users to develop SQL queries and reports. The SQL Development Kit allows programmers to develop SQL applications.

DB2 Universal Database for iSeries (DB2 UDB for iSeries)
The integrated relational database manager on the server. It provides access to and protection for data. It also provides advanced functions such as referential integrity and parallel database processing.

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

DBA
See database administrator.

DBA Utility
A tool that lets DB2 users configure databases and database manager instances, manage the directories necessary for accessing local and remote databases, back up and recover databases or table spaces, and manage media on a system using a graphical interface.

DBCLOB
See double-byte character large object.

DBCS
See double-byte character set.

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

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

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

DBCS data
In DB2 UDB for iSeries, data that is associated with a double-byte character set.

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

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

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

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

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

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

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

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

DBCTL
See Database Control.

DBD
(1) See database descriptor.
(2) See database description.

DBIID
See database instance ID.

DBMS
See database management system.

DBMS instance connection
A logical connection between an application and an agent process or thread owned by a DB2 instance.

DBO
See DL/I backout table.

DBPCB
See database program communication block.

DBRC
See Database Recovery Control.

DBRM
See database request module.

DC
(1) See data cache unit.
(2) See data chaining.

DCA
See Document Content Architecture.

DCB
See data control block.

DCBU
See D-channel backup.

DCC
See data country code.

DCDB
See domain control database.

DCE
(1) See data circuit-terminating equipment.
(2) See Distributed Computing Environment.
(3) See data communication equipment.

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

D-channel
See delta channel.

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

DCI
See data conversion interface.

DCLGEN
See declarations generator.

DCM
See Digital Certificate Manager.

DCR
See data connection resource.

DCS directory
See database connection services directory.

DCT
(1) See Digital Cordless Telephone.
(2) See destination control table.

DCU
See data cache unit.

DD
(1) See device driver.
(2) See data definition.

DDE
See dynamic data exchange.

DDE client
In VisualAge RPG, a part that provides the function of receiving DDE data from another DDE-enabled application.

DDEP
Direct dependent segment in a DEDB.

DDE server
In VisualAge RPG, a program entity that provides dynamic data exchange (DDE) data to another DDE-enabled application. In VisualAge RPG, all components have DDE server functionality.

DDF
See distributed data facility.

DDI
(1) See distributed data interface.
(2) See direct dial in.

DDIR
See DL/I database directory.

DDL
See data definition language.

DDM
See distributed data management.

DDM Architecture
See Distributed Data Management Architecture.

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

DDMMYYYY
Day-day-month-month-year-year format of a date (for example, 14022001 for 14 February 2001). This is the default format for the DATFORM system initialization parameter.

DDN
See Defense Data Network.

ddname
See data definition name.

DDO
See dynamic data object.

DDP
See Datagram Delivery Protocol.

DDS
(1) See data description specifications.
(2) See Dataphone digital service.

DDS1
See Digital Subscriber signaling System Number 1.

DDSA
See digital data service adapter.

DEA
See Data Encryption Algorithm.

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

dead-letter queue handler
A WebSphere MQ-supplied utility that monitors a dead-letter queue (DLQ) and processes messages on the queue in accordance with a user-written rules table.

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

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

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

debit cap
A limit for debit payments. MERVA Liquidity Manager holds all debit payments until there is sufficient liquidity available to cover them.

debit payment
A payment that debits the bank's account. It can be sent as an outgoing message to another bank, received as an in-house message, or received as a debit confirmation.

deblocking
The process of removing each logical record from a block. See also blocking.

debug
To detect, diagnose, and eliminate errors in programs.

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

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

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

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

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

debug mode
(1) An environment in which programs can be tested.
(2) A mode in which a program provides detailed output about its activities to aid a user in detecting and correcting errors in the program itself or in the configuration of the program or system.

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

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

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

decision
(1) A specific location on an activity diagram or state chart diagram where the workflow may branch based upon guard conditions.
(2) A process element that routes an input to one of several alternative outgoing paths, depending on its condition. A decision is like a question that determines the exact set of activities during the execution of a process. Questions might include: What type of order? Or How will the order be shipped?

decision point
A diamond-shaped graphical element in a Lotus Workflow process diagram, containing information about routing relationships. The routing conditions can be programmed into the decision point and the results evaluated in the routing relations. This can save routing time and allow for code reuse.

decision support system
In the Information Catalog Center, a system of applications that helps users make decisions by analyzing business data that is presented in meaningful ways; for example, spreadsheets, charts, and reports.

deck
An XML document that contains a collection of WML cards. See also card.

declaration
(1) In the C and C++ languages, a description that makes an external object or function available to a function or a block statement.
(2) In Java programming, a statement that establishes an identifier and associates attributes with it, without necessarily reserving its storage or providing the implementation. (Sun)

declarations generator (DCLGEN)
A subcomponent of DB2 Universal Database for z/OS and OS/390 that generates SQL table declarations and COBOL, C, or PL/I data structure declarations that conform to the table. The declarations are generated from DB2 Universal Database for z/OS and OS/390 system catalog information. DCLGEN is also a DSN subcommand.

declaratives
In COBOL, a set of one or more special-purpose sections, at the beginning of the Procedure Division that can be used for error checking or debugging.

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

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

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

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

decompose
In XML Extender, to separate XML documents into a collection of relational tables in an XML collection.

decompression
(1) Process of restoring compressed data to its original state, so that it can be used again.
(2) A function that exchanges control characters for actual data.

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

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

DECT
See Digital European Cordless Telecommunications.
DEDB
See data entry database.

dedicated line
A connection not requiring dialing to establish communication.

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

Dedicated Server for Domino (DSD)
An iSeries server that is specially designed to run Lotus Domino servers and applications.

dedicated service tools (DST)
(1) Service functions that are available only from the console and can run when the operating system is not available, as well as when the operating system is available.
(2) The part of the service function used to service the system when the operating system is not running.

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

de-edit
In COBOL, the logical removal of all editing characters from a numeric edited data item to determine the unedited numeric value of the item.

deep computing
Ultrafast computing that is combined with sophisticated analytical software to enable organizations to analyze, find patterns in, and take action on the data that they have gathered.

default
Pertaining to an attribute, value, or option that is assumed when none is explicitly specified.

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

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

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

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

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

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

default focal point
In SNA, a network node that receives alerts from nodes that do not have defined focal points. See also primary focal point.

default form
A temporary object that contains the description of the format of a printed or displayed report, which was built without explicitly specifying a form to be applied against it.

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

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

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

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

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

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

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

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

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

default process
The process is followed for completing a job unless another process is selected.

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

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

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

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

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

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

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

default subsystem name (DSN)
(1) In the z/OS or OS/390 environment, the name of the TSO command processor of DB2.
(2) In the z/OS or OS/390 environment, the first three characters of DB2 module and macro names.
(3) The name of the DB2 subsystem that can connect to the control server (the default subsystem name is DSN).

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

default user ID
The user identifier (user ID) of the default user. The default user ID is specified with the DFLTUSER system initialization parameter.

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

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

default view
(1) The view displayed the first time a user opens a Notes database.
(2) In XML Extender, a representation of data in which an XML table and all of its related side
tables are joined.

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

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

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

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

deferred flow
A flow whose recovery was deferred

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

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

deferred write
In DB2 Universal Database for z/OS and OS/390, the process of asynchronously writing changed data pages to disk.

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

defined userid
A user identifier (userid) named on a DEFINE PROCESS or DEFINE ACTIVITY command. It specifies the userid under whose authority the process or activity will be run, if it is activated by a RUN command. If the process or activity is activated by a LINK command, it runs under the authority of the userid of the transaction that issues the LINK.

define the file (DTF)
The DTF is a DAM control block that identifies to DAM the file associated with this DAM request. It is passed to DAM by DFHFCD to initiate a DAM request, and lasts for the lifetime of the CICS run. The DTF is included in the associated FCT entry, and is generated at FCT assembly time by the DTFDA macro. There is one DTF per DAM FCT entry.

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

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

definite response 1 indicator (DR1I)
A single bit in an SNA frame that signals whether a definite response 1 is requested.

definite response 2 indicator (DR2I)
A single bit in an SNA frame that signals whether a definite response 2 is requested.

definition metadata
In the Data Warehouse Center, information about the format of the data warehouse (the schema), the sources of the data, and the transformations applied in loading the data.

definitions file
In EGL, a file that is in EGL source format and that contains any number of function and data parts. The file may import other definitions files. The file name extension is .egldef.

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

defragmentation
The process of running a software utility to rewrite fragmented data to contiguous sectors of a computer storage medium to improve access and retrieval time. See also fragmentation.
degree of parallelism
The number of concurrently executed operations that are initiated to process a query.

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

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

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

delegate
A user who is authorized to work for another user. The authorization can be made by a user or by the office administrator.

delegation
(1) The process of propagating a security identity from a caller to a called object. According to the J2EE specification, a servlet and an enterprise bean can propagate either the client identity when invoking enterprise beans, or can use another specified identity as indicated in the corresponding deployment descriptor.
(2) In RACF, the act of giving other users or groups authorities to perform RACF operations.
(3) The ability of an object to issue a message to another object in response to a message. Delegation can be used as an alternative to inheritance. See also inheritance.

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

delete cascade
A DB2 process that causes an action to be taken on rows in a database when another row is deleted.

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

deleted users group
A security group of users who have been removed from other groups, have no permissions, and cannot log on to RequisitePro. This group is maintained by the project administrator for project history.

delete history
In the Information Catalog Center, a log of delete activity, the capture of which is turned on and off by the Information Catalog Center administrator. The log can be transferred to a tag language file.

delete hole
A row for a SELECT statement of a cursor that no longer has a corresponding row in the base table because the row was deleted. A delete hole is created when a row in the base table is deleted while a cursor is open whose SELECT statement result contains the row that is deleted. Such a row is no longer accessible though the cursor. See also update hole.

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

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

delete trigger
(1) A trigger that is activated when a record is deleted.
(2) A trigger that is associated with a delete operation.
deletion stub
A truncated document that is left in a Notes database in place of the original document to indicate to the Replication task that the document should, in fact, be deleted from all other replicas.

delimited identifier
(1) A sequence of characters enclosed by quotation marks ("). The sequence must consist of one or more characters of SQL. Leading blanks in the sequence are significant. Trailing blanks in the sequence are not significant. The length of a delimited identifier does not include the two quotation marks. See also ordinary identifier.
(2) In SQL, a sequence of one or more characters of the standard character set enclosed within SQL escape characters that are used to form a name.
delimited scope statement
In COBOL, any statement that includes its explicit scope terminator.

delimiter
A flag that is formed by a character or a sequence of characters in order to group or separate items of data by marking the beginning and end of a unit of data. The delimiter is not a part of the flagged unit of data.

delimiter token
(1) A string constant, a delimited identifier, an operator symbol, or any of the special characters shown in syntax diagrams.
(2) In SQL, a string constant, a delimited identifier, a symbol (for example, ||, /, *