cannot use any new functions of the new
version. Contrast with compatibility
mode*, enabling-new-function mode,
enabling-new-function mode*, and
new-function mode.
composite key
An ordered set of key columns or
expressions of the same table.
compression dictionary
The dictionary that controls the process of
compression and decompression. This
dictionary is created from the data in the
table space or table space partition.
concurrency
The shared use of resources by more than
one application process at the same time.
conditional restart
A DB2 restart that is directed by a
user-defined conditional restart control
record (CRCR).
connection
In SNA, the existence of a communication
path between two partner LUs that allows
information to be exchanged (for example,
two DB2 subsystems that are connected
and communicating by way of a
conversation).
connection context
In SQLJ, a Java object that represents a
connection to a data source.
connection declaration clause
In SQLJ, a statement that declares a
connection to a data source.
connection handle
The data object containing information
that is associated with a connection that
DB2 ODBC manages. This includes
general status information, transaction
status, and diagnostic information.
connection ID
An identifier that is supplied by the
attachment facility and that is associated
with a specific address space connection.
consistency token
A timestamp that is used to generate the
version identifier for an application. See
also version.
constant
A language element that specifies an
unchanging value. Constants are classified
as string constants or numeric constants.
Contrast with variable.
constraint
A rule that limits the values that can be
inserted, deleted, or updated in a table.
See referential constraint, check constraint,
and unique constraint.
context
An application’s logical connection to the
data source and associated DB2 ODBC
connection information that allows the
application to direct its operations to a
data source. A DB2 ODBC context
represents a DB2 thread.
contracting conversion
A process that occurs when the length of
a converted string is smaller than that of
the source string. For example, this
process occurs when an EBCDIC
mixed-data string that contains DBCS
characters is converted to ASCII mixed
data; the converted string is shorter
because the shift codes are removed.
control interval (CI)
v A unit of information that VSAM
transfers between virtual and auxiliary
storage.
v In a key-sequenced data set or file, the
set of records that an entry in the
sequence-set index record points to.
conversation
Communication, which is based on LU
6.2 or Advanced Program-to-Program
Communication (APPC), between an
application and a remote transaction
program over an SNA logical
unit-to-logical unit (LU-LU) session that
allows communication while processing a
transaction.
coordinator
The system component that coordinates
the commit or rollback of a unit of work
that includes work that is done on one or
more other systems.
coprocessor
See SQL statement coprocessor.
copy pool
A collection of names of storage groups
that are processed collectively for fast
replication operations.
Glossary 521
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