IBM DB2 Manual page 557

are the partitioning columns of the table.
The index can be partitioned or
nonpartitioned.
partner logical unit
An access point in the SNA network that
is connected to the local DB2 subsystem
by way of a VTAM conversation.
path See SQL path.
PDS See partitioned data set.
physical consistency
The state of a page that is not in a
partially changed state.
physical lock (P-lock)
A type of lock that DB2 acquires to
provide consistency of data that is cached
in different DB2 subsystems. Physical
locks are used only in data sharing
environments. Contrast with logical lock
(L-lock).
physically complete
The state in which the concurrent copy
process is completed and the output data
set has been created.
piece A data set of a nonpartitioned page set.
plan See application plan.
plan allocation
The process of allocating DB2 resources to
a plan in preparation for execution.
plan member
The bound copy of a DBRM that is
identified in the member clause.
plan name
The name of an application plan.
P-lock See physical lock.
point of consistency
A time when all recoverable data that an
application accesses is consistent with
other data. The term point of consistency
is synonymous with sync point or commit
point.
policy See CFRM policy.
postponed abort UR
A unit of recovery that was inflight or
in-abort, was interrupted by system
failure or cancellation, and did not
complete backout during restart.
precision
In SQL, the total number of digits in a
decimal number (called the size in the C
language). In the C language, the number
of digits to the right of the decimal point
(called the scale in SQL). The DB2
information uses the SQL terms.
precompilation
A processing of application programs
containing SQL statements that takes
place before compilation. SQL statements
are replaced with statements that are
recognized by the host language compiler.
Output from this precompilation includes
source code that can be submitted to the
compiler and the database request
module (DBRM) that is input to the bind
process.
predicate
An element of a search condition that
expresses or implies a comparison
operation.
prefix A code at the beginning of a message or
record.
preformat
The process of preparing a VSAM linear
|
data set for DB2 use, by writing specific
|
| data patterns.
prepare
The first phase of a two-phase commit
process in which all participants are
requested to prepare for commit.
prepared SQL statement
A named object that is the executable
form of an SQL statement that has been
processed by the PREPARE statement.
primary authorization ID
The authorization ID that is used to
identify the application process to DB2.
primary group buffer pool
For a duplexed group buffer pool, the
structure that is used to maintain the
coherency of cached data. This structure
is used for page registration and
cross-invalidation. The z/OS equivalent is
old structure. Compare with secondary
group buffer pool.
primary index
An index that enforces the uniqueness of
a primary key.
primary key
In a relational database, a unique, nonnull
key that is part of the definition of a
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Glossary