Availability Guide for Change Management

Glossary
Availability Guide for Change Management–125506
Glossary-3
CONFTEXT file
CONFTEXT file. An EDIT file containing a series of statements that define the hardware
and software components of your NonStop system. The CONFTEXT file is an input file
to the SYSGEN program.
CRU. See customer-replaceable unit (CRU).
customer-replaceable unit (CRU). A term used to describe certain system components that
can be installed and removed by Tandem customers while the NonStop system is
operating.
data definition language (DDL). The set of definition statements within the SQL language.
Data definition statements are used to define, delete, or modify the catalog definition of
a table, column, index, view, constraint, or partition or to change the authorization.
data volume. A disk volume configured to contain audited database files, and thus to
generate audit records to be placed in an audit trail.
database. A collection of tables containing data, all objects that depend on the tables, and all
catalogs in which the tables and objects are registered.
DDL. See data definition language (DDL).
design outage class. An outage class that includes bugs in design and design failures in
hardware and software. For example, an application change that introduces unexpected
problems could cause a design outage.
distributed database. A database whose objects reside on more than one node in a network
and whose objects can be accessed from any node in the network.
Distributed Systems Management (DSM) products. A set of software tools that facilitate
management of NonStop systems and networks. These tools include the Distributed
Name Service (DNS), the Event Management Service (EMS), the Subsystem Control
Facility (SCF) for communications subsystems, the Subsystem Programmatic Interface
(SPI), and the ViewPoint console application.
Distributed Systems Management/Software Configuration Manager (DSM/SCM). A
product for installing and managing software configurations on distributed target
systems. At the central site, DSM/SCM receives, archives, configures, and packages
software for the target sites. On the target sites, DSM/SCM loads new software received
from the central site.
downtime. Time during which the NonStop system is not capable of doing useful work
because of a planned or unplanned outage. From the end user’s perspective, downtime
is any time the application is not available. The cost of downtime can be dramatic in lost
revenue, lost consumer confidence, and lost productivity.
DSM. See Distributed Systems Management (DSM).
DSM/SCM. See Distributed Systems Management/Software Configuration Manager
(DSM/SCM).