TMF Glossary (G06.26+)

HP NonStop TMF Glossary—522415-003
Glossary-1
TMF Glossary
A
abort record. A record in a master audit trail identifying an aborted transaction.
aborted transaction. A transaction that was backed out (undone) or is in the process of
being backed out.
access control block (ACB). An operating system data structure that contains control
information for a particular open of a file. An ACB is composed of various types of
sections, depending on the type of file to which the ACB corresponds.
active-audit volume. A disk volume configured to contain active audit-trail files. These
volumes receive audit records from data volumes and the TMF transaction
management process (TMP). The audit records are placed into an active audit-trail file.
The associated disk process is called an audit disk process (ADP). An active-audit
volume cannot also be configured as a data volume.
The default active-audit volume name is $AUDIT.
after-image. A copy or copied portion of a database record made after a transaction
changes it. After-images are used in recovering committed transactions.
archive recovery mode. The recovery mode in which audit trail files are not held on disk for
volume recovery. In this mode, less audit information is kept on disk, so volume
recovery might require the restoration of audit files from dump media. Recovery mode
is part of data volume configuration. See also online recovery mode.
audit compression. The storing of before-images and after-images in audit trail files in
such a way that only the changed portions of database records are included in audit
records. Compressed audit requires less disk space than uncompressed data.
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