CA Dynam for VSE User Guide

DYNCAT Commands
When initializing a VTOC index with the DYNCAT VTOC function, a label must
be supplied to specify the extent to be used for the VTOC index. The dtfname
used is the same as the volser on which the VTOC index is to be built. If the
first character of the volser is numeric, the dtfname is not valid. The character
'V' may be inserted prior to the volser as the dtfname for the VTOC index
label. For example, for volser = "335000", use "// DLBL V335000,'...". Sixcharacter
dtfnames with a nonnumeric first character are valid.
Once initialized, the VTOC index will be rebuilt at each IPL, or at about 8:00
a.m. each morning automatically. The IXVOPTS macro may be used to change
the time at which the index is automatically rebuilt.
The VTOC INITIAL function results in the automatic deletion of all expired files
created using CA Dynam/D, which are found on the volume, in order to further
improve performance.
If you wish to retain expired files that currently exist, use the DYNUTIL ALTER
command to modify the expiration date of the file before running VTOC
INITIAL. Only expired files created using CA Dynam/D will be so deleted. Other
expired files will be retained until explicitly deleted by the user.
Chapter 8: Maintaining the Catalog−DYNCAT Program 8–95