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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.
DD statement. 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.
Glossary 569