IBM OS/390 manual O s s a r y

CP command. In VM, a command by which a terminal user controls his virtual machine. The VM/370 control program commands are called CP commands. The CP commands that perform console simulation are called console functions.

cross-domain resource. (1) Deprecated term for other-domain resource. (2) In VTAM programs, synonym for other-domain resource.

Custom-Built Installation Process Offering. A product that simplifies the ordering, installation, and service of MVS system control programs and licensed programs by providing them with current updates and corrections to the software that is already integrated.

customization. The process of designing a data processing installation or network to meet the requirements of particular users.

CustomPac. A series of offerings (that is, SystemPac, FunctionPac, ProductPac, and ServicePac) based on PUT levels combined with RSU levels.

cutover. The transfer of functions of a system to its successor at a given moment.

D

DASD. See direct access storage device.

data base description (DBD). In IMS/VS, the collection of macro parameter statements that describes an IMS/VS data base.

data definition language (DDL). A language for describing data and their relationships in a database. Synonymous with data description language.

data exchange. The use of data by more than one program or system. Data recorded or transmitted in a format is referred to as exchange data.

Data Facility Data Set Services (DFDSS). A backup and restore program product.

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

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

data integrity. The condition that exists as long as accidental or intentional destruction, alteration, or loss of data does not occur.

Data Language One (DL/I). 1. In IMS/VS, the data manipulation language that provides a common high-level interface between a user application and IMS/VS. 2. A data base access language used under VSE and CICS/VS.

data management. (1) In an operating system, the computer programs that provide access to data, perform or monitor storage of data, and control input/output devices. (2) In VSE, a major function of the operating system. It involves organizing, storing, locating, and retrieving data.

data migration. The moving of data from an online device to an offline or low-priority device, as determined by the system or as requested by the user. Contrast with staging.

data portability. The ability to use data sets or files with different operating systems. Volumes whose data sets or files are cataloged in a user catalog can be demounted from storage devices of one system, moved to another system, and mounted on storage devices of that system.

data set. Under MVS, a named collection of related data records that is stored and retrieved by an assigned name. Equivalent to a CMS file.

data set control block (DSCB). A data set label for a data set in direct access storage.

data set name. The term or phrase used to identify a data set. See also qualified name.

data space. In VSAM, a storage area defined in the volume table of contents of a direct-access volume to store files, indexes, and catalogs.

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

database management system (DBMS). A computer-based system for defining, creating, manipulating, controlling, managing, and using databases. The software for using a database may be part of the database management system or may be a stand-alone database system.

DBD. See data base description.

DDstatement. Data definition statement.

DDNAME. data definition name. The logical name of a file within an application. The DDNAME provides the means for the logical file to be connected to the physical file.

Device Support Facilities (ICKDSF). A program used for initialization of DASD volumes and track recovery.

default value. A value assumed when no value has been specified. Synonymous with assumed value.

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