CA Dynam for VSE User Guide

SORT Considerations
• Allocates secondary disk space only for the last of the SORTWKn files.
• Deletes the SORTWKn files from the VTOC as soon they are no longer
needed.
• Truncates SORTWKn files, if appropriate.
Note: If the facility to build the SORTWKn labels is used, the allocation of
DASD space is calculated either by CA SORT (based on information you pass in
the SIZE=n parameter) or by CA Dynam/D (from VTOC information collected
from all volumes where the requested SORTINn files reside). Normally, the
information passed is correct. But to avoid running out of available extents for
SORTWKn, generate CA Dynam/D with Automatic Secondary Allocation.
Thus by using CA SORT and CA Dynam/D, it is not necessary to specify
// ASSGN and
// DLBL SORTWKn statements; the file information in the CA Dynam Catalog
and the VTOC is correct.
IBM Sort/Merge Program
IBM sort files must be assigned to the proper device type before the SORT is
invoked. Otherwise the sort message UNIT ASSGN ERROR or a channel
program error can appear, and the SORT job will cancel. For example, if the
SORT files are to be read or created on a 3380 disk volume, these files must
be assigned to a 3380 device prior to running the SORT.
IBM Sort Work Files
CA Dynam/D does not support secondary allocation for IBM sort work files.
These files are deleted from the VTOC if all the following conditions are met:
• SORTOUT is closed
• DTFname of the sort work files is SORTWK
• DTFname for the sort output is SORTOUT
IBM Sort Output Files
The VTOC and CA Dynam Catalog are not correctly updated, because there is
no block and record size available for the IBM sort output file. This is because
IBM's Sort/Merge defines SORTOUT as a DTFPH file.
Chapter 4: Disk File Management 4–47