CA Dynam for VSE User Guide

Maintaining the Audit Trail File
Note:
• A software enqueue/dequeue technique prevents multiple access of the
Audit Trail at any given time.
• The Audit Trail file must be a single extent file. Messages are written to
SYSLOG as each ten-percent-full mark is reached. If the file fills up,
logging stops and audit entries are lost until a BACKUP of the file is
performed. CA Dynam records the number of entries lost.
Using the Catalog Recovery Facility
The CA Dynam Catalog Recovery facility enables you to recreate the Catalog
file in the event of disaster. Using a previous BACKUP tape of the file in
conjunction with the Audit Trail file, you can recover the Catalog without
concern for system integrity and reliability. CA Dynam uses an enqueue
technique that protects the Catalog during recovery from being updated by
any other jobs running on the system and programs running on other CPUs.
By default, only audit records created after the last BACKUP of the Catalog file
are considered during Catalog recovery. However, you can process multiple
backup tapes of the Audit Trail file. You may override the starting date and
time from which Audit Trail records are selected for processing.
Catalog recovery is a two-step process:
1. Issue the DYNCAT RESTORE command to restore the latest backup of the
Catalog file to disk. Be careful not to issue a RESTORE REORG; this resets
pointers required by the recovery function and should only be used if
recovery is not possible after a RESTORE.
2. Issue the AUDTUTIL CATALOG RECOVERY command. This permits you to
load selected Audit Trail records from a backup tape of the Audit Trail file,
the Audit Trail file itself, or both. You can also write the Audit Trail disk file
to tape by issuing the AUDTUTIL BACKUP command. For more information
about CATALOG RECOVERY and BACKUP commands, see Maintenance
Commands.
Note: The Audit facility is designed for Catalog recovery from a catastrophic
loss. If you suspect a noncritical or logical Catalog error, execute the DYNCAT
BACKUP, RESTORE REORG, and SCRATCH functions to correct the Catalog
error instead. Audit recovery is unnecessary under these circumstances;
RESTORE REORG resolves noncritical problems.
12–4 User Guide