Sscps Hk Daily Assignments Dcds


See device adapter.

See designated approving authority.

See database as a service.

See deactivate link.

See deactivate logical unit.

See deactivate physical unit.


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

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

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

See document access definition extension.

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

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

See dump analysis and elimination.

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

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

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

See destination address field.

See directed acyclic graph.

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

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

daily planning
The process of creating a current plan.

daily stand-up
See scrum.

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

daisy chain

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

See digital asset management.

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

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

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

See directory access protocol.

See dynamic automatic reconfiguration.

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

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

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

See Defense Advanced Research Projects Agency.

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


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

See direct access storage device.

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

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

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

DASDVOL authority
See DASD volume authority.

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

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


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

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

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

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

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

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

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

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

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

data aggregate

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

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

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

data archive
A storage area for backup copies of files.

data area

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

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

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

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

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

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

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

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

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

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

database activity
See activity.

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

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

database alias

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

database file

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

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

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

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

database ID
See database identifier.

database identifier (database ID)

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

database instance
See database manager instance.

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

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

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

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

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

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

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

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

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

database management system (DBMS)

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

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

database manager

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

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

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

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

database monitor (DB monitor)
See IMS monitor.

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

database node
See database partition.

database object

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

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

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

database partitioning

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

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

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

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

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

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

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

database recovery log
See database log.

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

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

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

database request
See request.

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

database resource adapter (DRA)

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

database schema
See schema.

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

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

database server

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

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

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

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

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

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

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

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

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

data binding

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

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

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

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

data cache

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

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

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

data capture

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

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

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

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

data center

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

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

data center device
See data center asset.

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

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

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

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

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

data channel
See input/output channel.

data character set
See character set.

data check

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

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

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

data class

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

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

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

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

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

data collection

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

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

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

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

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

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

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

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

data component

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

data compression

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

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

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

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

data consistency

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

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

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

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

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

data conversion

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

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

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

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

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

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

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

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

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

data definition

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

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

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

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

data definition statement

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

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

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

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

Data Description Language
See Data Definition Language.

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

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

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

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

data dictionary

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

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

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

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

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

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

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

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

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

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

data element

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

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

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

Data Encryption Algorithm

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

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

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

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

data entry

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

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

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

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

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

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

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

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

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

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

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

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

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

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

data field

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

See container.

data file

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

data file structure
A collection of fields.

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

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

data flow

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

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

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

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

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

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

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

data frame
A rectangular division of computer output on microfilm.


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

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

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

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

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

data grid

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

data group

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

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

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

data host

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

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

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

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

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

data integrity

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

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

data interchange

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

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

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

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

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

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

data item

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

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

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

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

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

data line

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

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

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

data link

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

data link connection identifier (DLCI)

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

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

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

Data Link Control protocol (DLC)

Daily Assignments 7 March 2018

1AClasswork/HomeworkPreparation / RevisionWork Sheet / Project
Chinese1.改習作P.5-10 2.工作紙P.8 3.課本p.12
English1.RED 2.Dict 7/5 3.Spell test sign + corr
Mathematics1.WB Corr + Ex 8(1-13) 2.Quiz 15/3 chp 1-4
S & C.S
S & HE
OtherMusic : please bring 1下 music book THUR


















































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