TMF Glossary (G06.26+)

TMF Glossary
HP NonStop TMF Glossary—522415-003
Glossary-12
OLTP
OLTP. See online transaction processing.
OLTP application. An application in which many users can update data simultaneously,
recording the changes in the database as they are entered.
online backup. A copy of an audited database file written to secondary storage media
(such as tape) while transactions are being processed by database applications and
TMF is running. If the database is damaged and the audit trail files have been regularly
backed up, the file recovery process can restore the online backup files to disk and
then apply the audit trail images to reconstruct the files. Contrast with offline backup
and audit dump.
online dump. A copy of an audited database file written to tape or disk when a DUMP
FILES command is issued. If the database is damaged, the file recovery process can
restore the online dump files to disk and then apply the audit trail images to reconstruct
the files. Online dumps can be made while transactions are being processed by
database applications; that is, while TMF is running.
online recovery mode. The data volume recovery mode in which TMF maintains a
sufficient number of audit trail files on disk for volume recovery. Compare with archive
recovery mode.
online transaction processing. A method of processing transactions in which entered
transactions are immediately applied to the database. The information within the
database is readily available to all users through online screens and printed reports.
The transactions are processed while the requester waits, as opposed to queued or
batched transactions, which are processed at a later time.
Online transaction processing can be used for many different kinds of business tasks
such as order processing, inventory control, accounting functions, and banking
operations.
overflow-audit volume. A disk volume configured to store audit-trail files when an active-
audit volume, managed by TMF, becomes too full.
Space on an overflow-audit volume is used only in extreme cases, such as when there
is no tape available or no disk space available for an audit dump, or when generation
of audit records suddenly increases, which causes the active-audit volumes to fill
before the oldest audit-trail file is no longer needed.
The default overflow-audit volume name is $AUDIT (the same as the active-audit
volume).
overflow threshold. A configurable parameter for an audit trail that specifies the
percentage of the active audit volumes' capacity that can be used before TMF copies
the oldest audit trail files to the overflow audit volumes.