FastSort Manual

Using SORT and SUBSORT DEFINEs
FastSort Manual—429834-003
7-9
Creating a SUBSORT DEFINE
Creating a SUBSORT DEFINE
A SUBSORT DEFINE controls a subsort process in a parallel sort run. Specify
between 2 and 8 SUBSORT DEFINEs for a SORT DEFINE.
You create a SUBSORT DEFINE in the same manner as a SORT DEFINE. To use a
SUBSORT DEFINE, you must also name the SUBSORT DEFINE in the SORT
DEFINE SUBSORTS attribute. At run time, each SUBSORTS attribute of a SORT
DEFINE must correspond to an existing SUBSORT DEFINE.
The following example creates a SUBSORT DEFINE named =SUBSORTA, which is
associated with the =DISTRIBUTOR_COLLECTOR SORT DEFINE:
SET DEFINE CLASS SUBSORT
SET DEFINE SCRATCH $disk.temp1
SET DEFINE SWAP $disk.temp2
ADD DEFINE =subsorta
An INFO DEFINE command for =SUBSORTA displays:
Define Name =SUBSORTA
CLASS SUBSORT
SCRATCH $DISK.TEMP1
SWAP $DISK.TEMP2
Modifying a DEFINE
You can also use TACL commands to add, modify, or delete the attributes of a SORT
or SUBSORT DEFINE (or the entire DEFINE). The following examples show several
ALTER DEFINE and RESET DEFINE commands with the results displayed with the
INFO DEFINE command.
To add one or more SUBSORT DEFINE names to an existing SORT DEFINE, use the
ALTER DEFINE command:
ALTER DEFINE =distributor_collector, &
SUBSORTS (=subsorta,=subsortb,=subsortc,=subsortd)
INFO DEFINE =distributor_collector, DETAIL
Define Name =DISTRIBUTOR_COLLECTOR DEFINE
CLASS SORT
SWAP $DISK.FASTSORT.SWAPFILE
MODE MINSPACE
SUBSORTS (=SUBSORTA,=SUBSORTB,=SUBSORTC,=SUBSORTD)
You can also use the ALTER DEFINE command to modify a SUBSORT DEFINE name
of an existing SORT DEFINE. The following command removes =SUBSORTA:
ALTER DEFINE =distributor_collector, &
SUBSORTS (=subsortb, =subsortc, =subsortd)
Note. FastSort supports up to 16 SUBSORT DEFINEs; however, to prevent run-time errors
and performance problems, HP recommends that you specify no more than 8 SUBSORT
DEFINEs.