parallelism coordinator
In Sysplex query parallelism, the DB2
subsystem from which the parallel query
originates.
Parallel Sysplex
A set of z/OS systems that communicate
and cooperate with each other through
certain multisystem hardware components
and software services to process customer
workloads.
parallel task
The execution unit that is dynamically
created to process a query in parallel. A
parallel task is implemented by a z/OS
service request block.
parameter marker
A question mark (?) that appears in a
statement string of a dynamic SQL
statement. The question mark can appear
where a variable could appear if the
statement string were a static SQL
statement.
parameter-name
An SQL identifier that designates a
parameter in a routine that is written by a
user. Parameter names are required for
SQL procedures and SQL functions, and
they are used in the body of the routine
to refer to the values of the parameters.
Parameter names are optional for external
routines.
parent key
A primary key or unique key in the
parent table of a referential constraint.
The values of a parent key determine the
valid values of the foreign key in the
referential constraint.
parent lock
For explicit hierarchical locking, a lock
that is held on a resource that might have
child locks that are lower in the hierarchy.
A parent lock is usually the table space
lock or the partition intent lock. See also
child lock.
parent row
A row whose primary key value is the
foreign key value of a dependent row.
parent table
A table whose primary key is referenced
by the foreign key of a dependent table.
parent table space
A table space that contains a parent table.
A table space containing a dependent of
that table is a dependent table space.
participant
An entity other than the commit
coordinator that takes part in the commit
process. The term participant is
synonymous with agent in SNA.
partition
A portion of a page set. Each partition
corresponds to a single, independently
extendable data set. The maximum size of
a partition depends on the number of
partitions in the partitioned page set. All
partitions of a given page set have the
same maximum size.
partition-by-growth table space
A table space whose size can grow to
accommodate data growth. DB2 for z/OS
manages partition-by-growth table spaces
by automatically adding new data sets
when the database needs more space to
satisfy an insert operation. Contrast with
range-partitioned table space. See also
universal table space.
partitioned data set (PDS)
A data set in disk storage that is divided
into partitions, which are called members.
Each partition can contain a program,
part of a program, or data. A program
library is an example of a partitioned data
set.
partitioned index
An index that is physically partitioned.
Both partitioning indexes and secondary
indexes can be partitioned.
partitioned page set
A partitioned table space or an index
space. Header pages, space map pages,
data pages, and index pages reference
data only within the scope of the
partition.
partitioned table space
A table space that is based on a single
table and that is subdivided into
partitions, each of which can be processed
independently by utilities. Contrast with
segmented table space and universal table
space.
partitioning index
An index in which the leftmost columns
540 Application Programming Guide and Reference for Java
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