Auxiliary Audit Trails - HP NonStop TMF Programming Manual

Introduction to TMF Audit Trails
Together, TMF control records constitute a chronological record of all transaction-
related activities.
If the database is distributed over a network, separate audit trails are maintained on
each node where the database resides. Before-images and after-images are written to
the audit trail on the same node as reside the rows or records changed by the
transaction.
The Master Audit Trail
There is one master audit trail (MAT) in each TMF system. The MAT contains all of
the TMF control records and usually also contains audit records for a set of data
volumes specified by the TMF system manager.

Auxiliary Audit Trails

Application environments with unusual performance or capacity demands can
sometimes benefit from the use of additional audit trails, called auxiliary audit trails.
These audit trails contain audit records in addition to those in the MAT; they do not
duplicate the MAT's audit records.
Active-Audit Volumes
When you configure an audit trail, you specify the names of the disk volumes that will
receive audit information. These are referred to as active-audit volumes. You can add
and delete active-audit volumes without stopping TMF or your applications. An
active-audit volume cannot also be a data volume.
Overflow-Audit Volumes
When you configure an audit trail, you can also specify disk volumes to use if all
restore-audit files become filled. These are referred to as overflow-audit volumes.
They can be any disk volumes in the system (including data volumes or active-audit
volumes).
Audit Dumps
Audit dumps preserve copies of restore-audit files for file recovery. Audit dumps copy
restore-audit files from active-audit volumes to tape or disk. Audit-trail files remain
either on active-audit volumes or on the audit dump medium until they are no longer
needed for recovery.
Restore-Audit Volumes
When you configure an audit trail, you can also specify disk volumes for receiving
copies of restore-audit files restored from an audit dump during a recovery. These are
referred to as restore-audit volumes. They can be any disk volumes in the system
(including data volumes or active-audit volumes).
HP NonStop TMF Management Programming Manual—540140-008
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