“old” (for primary) and “new” (for
secondary) structures.
group buffer pool (GBP)
A coupling facility cache structure that is
used by a data sharing group to cache
data and to ensure that the data is
consistent for all members.
group buffer pool recovery pending (GRECP)
The state that exists after the buffer pool
for a data sharing group is lost. When a
page set is in this state, changes that are
recorded in the log must be applied to the
affected page set before the page set can
be used.
group level
The release level of a data sharing group,
which is established when the first
member migrates to a new release.
group name
The z/OS XCF identifier for a data
sharing group.
group restart
A restart of at least one member of a data
sharing group after the loss of either locks
or the shared communications area.
GTF See generalized trace facility.
handle
In DB2 ODBC, a variable that refers to a
data structure and associated resources.
See also statement handle, connection
handle, and environment handle.
help panel
A screen of information that presents
tutorial text to assist a user at the
workstation or terminal.
heuristic damage
The inconsistency in data between one or
more participants that results when a
heuristic decision to resolve an indoubt
LUW at one or more participants differs
from the decision that is recorded at the
coordinator.
heuristic decision
A decision that forces indoubt resolution
at a participant by means other than
automatic resynchronization between
coordinator and participant.
histogram statistics
A way of summarizing data distribution.
This technique divides up the range of
possible values in a data set into intervals,
such that each interval contains
approximately the same percentage of the
values. A set of statistics are collected for
each interval.
hole A row of the result table that cannot be
accessed because of a delete or an update
that has been performed on the row. See
also delete hole and update hole.
home address space
The area of storage that z/OS currently
recognizes as dispatched.
host The set of programs and resources that
are available on a given TCP/IP instance.
host expression
A Java variable or expression that is
referenced by SQL clauses in an SQLJ
application program.
host identifier
A name that is declared in the host
program.
host language
A programming language in which you
can embed SQL statements.
host program
An application program that is written in
a host language and that contains
embedded SQL statements.
host structure
In an application program, a structure
that is referenced by embedded SQL
statements.
host variable
In an application program written in a
host language, an application variable
that is referenced by embedded SQL
statements.
host variable array
An array of elements, each of which
corresponds to a value for a column. The
dimension of the array determines the
maximum number of rows for which the
array can be used.
IBM System z9 Integrated Processor (zIIP)
A specialized processor that can be used
for some DB2 functions.
IDCAMS
An IBM program that is used to process
access method services commands. It can
Glossary 531
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