Availability Guide for Change Management

Glossary
Availability Guide for Change Management–125506
Glossary-2
auxiliary audit trail
auxiliary audit trail. An audit trail configured in addition to the master audit trail.
availability. Tandem is using this term to describe end-user availability. End-user availability
is the amount of time an application running on a Tandem system can be used effectively
by the user of that application.
catalog. A set of tables containing the descriptions of SQL objects such as tables, columns,
indexes, views, files, and partitions.
change control. The process for proposing, planning, implementing, and testing change.
Change control is a key requirement for minimizing the duration of planned and
unplanned outages. Change control ensures the successful migration of a system or
application from one stable configuration another. Change control is also an important
part of maintaining the security of your system and applications.
change-control process. A process for implementing change control. Tandem recommends a
four-phase change-control process. The four phases are as follows: definition and
documentation, change planning, implementation, and verification.
change management. The process of managing the maintenance and growth of your
NonStop system. Change management involves managing all hardware, software, and
procedural changes and includes all of the tasks required to properly manage change
within the operations environment. One of the operational disciplines in the operations-
management model.
client/server computing environment. An environment in which programs are divided
between a client program, which resides on a personal computer (PC), Macintosh, or
workstation, and server programs, which reside on a host system such as a Tandem
NonStop system. Users typically request information from server programs through an
easy-to-use graphical user interface (GUI) provided by the client program. The
client/server architecture is usually linked together by a local area network (LAN).
column. A vertical component of a table; the relational representation of a field in a record.
A column contains one data value for reach row of the table.
command file. A file that contains a series of commands. When the file is executed, the
commands within the file are automatically executed. Command files are supported by
the Tandem Advanced Command Language (TACL) and many Tandem subsystems.
communications controller. A hardware component that manages communications lines or
devices.
communications subsystem. A Tandem product that provides users with access to a set of
communications services. Examples of communications subsystems include Expand
and Tandem TCP/IP.
configuration management. The process of configuring the production system hardware and
software to adapt to changes. One of the operational disciplines in the operations-
management model.