CA Dynam for VSE User Guide

Using Other Software with CA Dynam/FI
Version attributes (record length, block size, and so on) for cataloged data
sets are updated by CA Dynam/FI when requested to do so by CA SORT,
normally after the sort output file has been closed. This is necessary because
the file table used by CA SORT (DTFPH) does not have provisions for record
format, block size or record length. As a result, the version attributes would be
incomplete unless a facility such as CA Dynam/FI was available to update
them. The cataloged data set must have DYNAM/FI=YES for the update
processing to be effective.
Note: In order for the Catalog to be properly updated by CA Dynam/FI, do not
use the CA Dynam/T DROP option for SORTOUT tape files.
CA SRAM
CA SRAM modules are normally loaded into the upper unused portion of the
partition. This may conflict with the user's program. For example, PL/I also
uses this upper portion of the partition. If there is a chance that a conflict may
occur, use the CA Dynam/FI SET SORTCORE statement. It reserves a block of
storage from the partition GETVIS for working space and overhead for SRAM.
For more information about calculating the storage requirement, see the CA
SRAM documentation set.
With Existing Programs
This section lists miscellaneous items of special interest if you are planning to
use CA Dynam/FI to modify the attributes of files processed by existing
programs or are designing new programs.
Files Assigned to IGNORE
Some user programs open files that are only occasionally or never used. These
files are often assigned to IGNORE to prevent a tape volume or disk space
from being dedicated to the unused file. Since normal OPEN/CLOSE processing
does not require label information to be present for files assigned to IGN, the
DLBL or TLBL statements for the file may no longer be in the job stream.
When this condition exists, and CA Dynam/FI locates a label record on the
partition or system standard label area for the same DTFNAME, unpredictable
results may occur.
For example, if a program opened an output tape file with the DTFNAME
'MASTER,' the logical unit assigned to IGN and no TLBL included in the job
stream, CA Dynam/FI might find DLBL and EXTENT information for a disk file
with the same DTFNAME on the system standard labels. In this condition, a
disk DTF would be constructed by CA Dynam/FI using the logical unit specified
in the EXTENT statement. This OPEN would then fail due to 'INVALID LOGICAL
UNIT' if, for example, the logical unit was assigned to the card reader.
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