copy target
A named set of SMS storage groups that
are to be used as containers for copy pool
volume copies. A copy target is an SMS
construct that lets you define which
storage groups are to be used as
containers for volumes that are copied by
using FlashCopy functions.
copy version
A point-in-time FlashCopy copy that is
managed by HSM. Each copy pool has a
version parameter that specifies the
number of copy versions to be maintained
on disk.
correlated columns
A relationship between the value of one
column and the value of another column.
correlated subquery
A subquery (part of a WHERE or
HAVING clause) that is applied to a row
or group of rows of a table or view that is
named in an outer subselect statement.
correlation ID
An identifier that is associated with a
specific thread. In TSO, it is either an
authorization ID or the job name.
correlation name
An identifier that is specified and used
within a single SQL statement as the
exposed name for objects such as a table,
view, table function reference, nested table
expression, or result of a data change
statement. Correlation names are useful in
an SQL statement to allow two distinct
references to the same base table and to
allow an alternative name to be used to
represent an object.
cost category
A category into which DB2 places cost
estimates for SQL statements at the time
the statement is bound. The cost category
is externalized in the COST_CATEGORY
column of the DSN_STATEMNT_TABLE
when a statement is explained.
coupling facility
A special PR/SM logical partition (LPAR)
that runs the coupling facility control
program and provides high-speed
caching, list processing, and locking
functions in a Parallel Sysplex.
coupling facility resource management (CFRM)
A component of z/OS that provides the
services to manage coupling facility
resources in a Parallel Sysplex. This
management includes the enforcement of
CFRM policies to ensure that the coupling
facility and structure requirements are
satisfied.
CP See central processor.
CPC See central processor complex.
CRC See command recognition character.
created temporary table
A persistent table that holds temporary
data and is defined with the SQL
statement CREATE GLOBAL
TEMPORARY TABLE. Information about
created temporary tables is stored in the
DB2 catalog and can be shared across
application processes. Contrast with
declared temporary table. See also
temporary table.
cross-system coupling facility (XCF)
A component of z/OS that provides
functions to support cooperation between
authorized programs that run within a
Sysplex.
cross-system extended services (XES)
A set of z/OS services that allow multiple
instances of an application or subsystem,
running on different systems in a Sysplex
environment, to implement
high-performance, high-availability data
sharing by using a coupling facility.
CS See cursor stability.
CSA See common service area.
CT See cursor table.
current data
Data within a host structure that is
current with (identical to) the data within
the base table.
current status rebuild
The second phase of restart processing
during which the status of the subsystem
is reconstructed from information on the
log.
cursor A control structure that an application
program uses to point to a single row or
multiple rows within some ordered set of
rows of a result table. A cursor can be
used to retrieve, update, or delete rows
from a result table.
522 Application Programming Guide and Reference for Java
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