Availability Guide for Change Management

Availability Guide for Change Management–125506
Glossary-1
Glossary
This glossary includes a selection of terms used in this manual. Definitions of
application and communications subsystem terms are brief and not very detailed; they
are intended only to make this manual more meaningful than it would otherwise be to
readers unfamiliar with Tandem’s application and communications subsystems.
active audit trail. The set of audit-trail files that reside on an active audit volume.
active audit volume. The disk volume configured to contain audit-trail files.
alternate key. See index.
API. See application programming interface (API).
application programming interface (API). The means by which a program within an
application gains access to a set of services. For example, an API might consist of a set
of procedure calls that provide a workstation application with a standard interface for
communicating with a Tandem NonStop system.
application subsystem. A Tandem product that provides users with application services.
NonStop Transaction Services/MP (NonStop TS/MP), NonStop SQL/MP, and NonStop
Transaction Manager/MP (NonStop TM/MP) are application subsystems.
audit dump. A copy of an audit-trail file written to a tape or disk volume by an audit-dump
process.
audit record. A before-image, after-image, or TMF control record stored in an audit-trail file.
audit trail. A series of audit-trail files containing audit records.
audit-trail file. A disk file containing audit records.
audited file. A database file flagged for auditing by the TMF subsystem.
audited volume. A disk volume on which audited database files can reside.
autoabort function. A NonStop Transaction Manager/MP operation that automatically
aborts transactions if they run longer than the autoabort threshold.
autoabort threshold. The time limit used by NonStop Transaction Manager/MP to identify
long transactions. When a transaction runs longer than the threshold, the TMF
subsystem aborts it.
automatic recompilation. An SQL compilation that NonStop SQL/MP performs at run time
when an SQL object program is flagged as invalid. Automatic recompilation occurs, for
example, when an SQL statement refers to a table or includes a DEFINE that has
changed since the last explicit compilation of the program.