TMF Operations and Recovery Guide (G06.24+)

Managing Enscribe Files

HP NonStop TMF Operations and Recovery Guide—522417-002

B-7

The PURGEDATA Command

You can use the FUP PURGEDATA command to delete the contents of an audited file.

Should the TMF file recovery feature be initiated on this file, it will restore the existing

online dump and then redo the PURGEDATA operation when encountered in the TMF

audit trail.

If you mistakenly issue a FUP PURGEDATA command, you can recover the file by

issuing a RECOVER FILES command with the TIME option set to a time before the

data was purged.

The RELOAD Command

The use of FUP RELOAD for audited files or tables can result in severe performance

and response-time problems if a large file or table is reloaded at a high rate. Further, a

typical FUP RELOAD operation of an audited file or table generates a large amount of

TMF audit information, sometimes more than twice the size of the file or table. If the

TMF audit-trail configuration does not have the capacity for the additional audit

information, TMF may disable service to new transactions for an indefinite amount of

time. If FUP RELOAD is going to be used on an audited file or table, consider

increasing the active and/or overflow capacity of the TMF audit trail.

The RENAME Command

You cannot use the FUP RENAME command to rename an audited file: attempting to

rename an audited file results in a file system error. If you must rename an audited file,

first issue a FUP ALTER command to change the file’s audit attribute to nonaudited.

After you have renamed the file, issue another FUP ALTER command to change its

audit attribute back to audited.

If you want to be able to use the TMF file recovery feature, you should make an online

dump of the file, as any previous online dumps of the file were invalidated when the

destination file was altered to nonaudited.

Caution. Any damage to the destination file when it is in the nonaudited state could be

permanent. Before changing the file to nonaudited, you should first ensure that all openers

have closed the file, and then make a backup copy of it.