checkpoint
A point at which DB2 records status
information on the DB2 log; the recovery
process uses this information if DB2
abnormally terminates.
child lock
For explicit hierarchical locking, a lock
that is held on either a table, page, row,
or a large object (LOB). Each child lock
has a parent lock. See also parent lock.
CI See control interval.
CICS Represents (in this information): CICS
Transaction Server for z/OS: Customer
Information Control System Transaction
Server for z/OS.
CICS attachment facility
A facility that provides a multithread
connection to DB2 to allow applications
that run in the CICS environment to
execute DB2 statements.
claim A notification to DB2 that an object is
being accessed. Claims prevent drains
from occurring until the claim is released,
which usually occurs at a commit point.
Contrast with drain.
claim class
A specific type of object access that can be
one of the following isolation levels:
v Cursor stability (CS)
v Repeatable read (RR)
v Write
class of service
A VTAM term for a list of routes through
a network, arranged in an order of
preference for their use.
clause In SQL, a distinct part of a statement,
such as a SELECT clause or a WHERE
clause.
CLI See call-level interface.
client See requester.
CLOB See character large object.
clone object
An object that is associated with a clone
table, including the clone table itself and
check constraints, indexes, and BEFORE
triggers on the clone table.
clone table
A table that is structurally identical to a
base table. The base and clone table each
have separate underlying VSAM data
sets, which are identified by their data set
instance numbers. Contrast with base
table.
closed application
An application that requires exclusive use
of certain statements on certain DB2
objects, so that the objects are managed
solely through the external interface of
that application.
clustering index
An index that determines how rows are
physically ordered (clustered) in a table
space. If a clustering index on a
partitioned table is not a partitioning
index, the rows are ordered in cluster
sequence within each data partition
instead of spanning partitions.
CM See compatibility mode.
CM* See compatibility mode*.
C++ member
A data object or function in a structure,
union, or class.
C++ member function
An operator or function that is declared
as a member of a class. A member
function has access to the private and
protected data members and to the
member functions of objects in its class.
Member functions are also called
methods.
C++ object
A region of storage. An object is created
when a variable is defined or a new
function is invoked.
An instance of a class.
coded character set
A set of unambiguous rules that establish
a character set and the one-to-one
relationships between the characters of
the set and their coded representations.
coded character set identifier (CCSID)
A 16-bit number that uniquely identifies a
coded representation of graphic
characters. It designates an encoding
scheme identifier and one or more pairs
that consist of a character set identifier
and an associated code page identifier.
code page
A set of assignments of characters to code
Glossary 519
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