Availability Guide for Application Design

Availability Guide for Application Design—525637-004
Glossary-1
Glossary
ACF. See application configuration file (ACF).
action event. An event that requires operator intervention to resolve. Each subsystem
determines which events are action events by including a unique Event Management
Service (EMS) token in the event message. Action events are reported as pairs of
event messages: an action-attention message to report the problem and an action-
completion message to report the problem resolution. See also Event Management
Service (EMS), event message, critical event, and information event.
active backup. A programming technique used to achieve fault tolerance in application
programs. In active backup programming, a process executes as a process pair: a
primary process which performs the application processing, and a backup process,
which is ready to take over execution if the primary process fails. The backup process
of an active backup process pair updates its own state when instructed to do so by the
primary process; the updated information is logically the same as in the primary.
Contrast with passive backup.
after-image. A copy or copied portion of a database record that is made by the TMF
product after a transaction makes changes to a record. See also before-image.
API. See application program interface (API).
application configuration file (ACF). A file provided by the EMS FastStart product to
contain the parameters for each event generated by EMS FastStart. See also Event
Management Service (EMS) FastStart, and EGEN.
application program interface (API). A set of services (such as programming language
functions or procedures) that are called by an application program to communicate with
other software components.
Application-Transaction Monitor Interface (ATMI). The Tuxedo system API which
provides an interface to the System /T transaction monitor; the interface includes
transition routines, message-handling routines, service-interface routines, and buffer-
management routines.
ATMI. See Application-Transaction Monitor Interface (ATMI).
audit dump. A copy of one or more audit-trail files written to a tape or disk volume.
audited file. A disk file that is flagged for auditing by the Transaction Management Facility
(TMF).
audited table. A table that is flagged for auditing by the Transaction Management Facility
(TMF).
audited volume. A disk volume on which audited disk files can reside.