TMF Glossary (G06.26+)

TMF Glossary
HP NonStop TMF Glossary—522415-003
Glossary-2
audit dump
audit dump. A copy of an audit trail file written to a tape or disk volume by an audit dump
process: audit dumps occur automatically when an audit trail file becomes full. An audit
dump process may be configured for each audit trail; it can be reconfigured while TMF
is running. Audit dumps preserve audit trail files for use by the file recovery process.
Audit trail files remain either on active audit volumes, overflow audit volumes, or the
audit dump medium until they are no longer needed for recovery.
audit record. A before-image, after-image, or TMF control-record stored in an audit trail file.
Usually, several audit records exist for each transaction.
audit trail. A series of audit trail files containing audit records. Before a transaction
permanently commits its changes to a database, information about the affected rows or
records of each transaction is written to the audit trail. If a database is distributed over
a network, separate audit trails are maintained on each node where the database
resides. The master audit trail (MAT) is required. In addition, you can configure up to
15 auxiliary audit trails.
audit-trail file. A disk file containing audit records. The system manager configures each
active-audit volume to contain a specified number of audit-trail files. TMF preallocates
space for these files to make sure there is enough disk space for the active volume as
configured. For example, if you configure 4 active-audit volumes and specify 6 audit-
trail files, then TMF preallocates space for all 24 files.
audit-trail rollover. The switching of the current audit-trail file to the next file in the
sequence.
audit-trail sequence. The set and order of audit-trail files belonging to an audit trail.
audit-trail sequence number. A six-digit integer that is combined with the name of an audit
trail to form the file name of an audit-trail file.
audit-trail volume. See active-audit volume.
audited file. A database file flagged for auditing by TMF; auditing is the monitoring of
transactions in preparation for recovery efforts. Audited files cannot reside on active
audit volumes.
audited volume. A disk volume on which audited database files can reside. Nonaudited
files can also reside on audited volumes, but are not protected by TMF. See also data
volume.
audited table. A table flagged for auditing by TMF. TMF monitors all transactions against
an audited table in preparation for possible transaction backout or volume recovery.
autoabort function. A TMF operation that automatically aborts transactions if they run
longer than the autoabort threshold or if they span more than 45% of the audit trail
capacity.