CA Dynam for VSE User Guide

DYNCAT Commands
Using RESTORE without Operands
If you do not specify any operands for the RESTORE command, the restored
Catalog will be physically identical to the backup copy created through the
BACKUP command. This function may be used to move the Catalog from one
device type to another, or from one extent to another. If the Catalog is
destroyed due to disk I/O failure, this physical restore may be used in
conjunction with the Audit Trail facility Catalog recovery feature to
automatically bring the Catalog up-to-date.
The physical RESTORE function runs very quickly since no analysis of the file
need be done. The Catalog need not be initialized before the physical restore is
performed since the records are restored exactly as they previously had
existed.
Note: The physical RESTORE function may be used to enlarge the Catalog,
change the extents of the Catalog, move the Catalog to a different device
type, or restore the Catalog to its previous location. It may not be used to
change Catalog characteristics as specified when the Catalog was initialized.
Using RESTORE with Operands
If you specify the RESTORE command and the REORG operand, DYNCAT both
restores and logically reorganizes the Catalog from the tape copy produced by
the BACKUP function. This tape contains sufficient information to perform
either function.
The Catalog produced by RESTORE REORG will be logically identical to the
Catalog as it was backed up, but will be physically quite different. Index blocks
will be rebuilt, free space will be concatenated, and disk utilization will be
optimized. In addition, if any logical errors are encountered during the
reorganization, they will be corrected and error messages issued to the
SYSLST device to document the actions taken.
Unlike the physical RESTORE function, the RESTORE REORG function allows
the user to modify the characteristics of the Catalog as originally established
through the INITIAL command and to MERGE one Catalog into another.
Ordinarily, the DATASETS, VOLUMES, and SORTKEYS operands would not be
submitted for a RESTORE REORG, since this information is present on the
BACKUP tape and RESTORE REORG will use it to optimize performance
dynamically. However, they are supported as overrides, if desired. Any that
are submitted will override those already in effect in the Catalog. Any that are
omitted will be taken from the BACKUP tape.
If you inadvertently specify options with RESTORE, but do not specify REORG,
the options are ignored and a RESTORE is done as if no operands were
supplied.
Chapter 8: Maintaining the Catalog−DYNCAT Program 8–81