MPE/iX Glossary of Terms and Acronyms (32650-90887)

Chapter 1 17
Glossary of Terms
the file and less concerned about earlier material.
2. A file that can be reused (DBCore nonarchive log files are circular files).
class A user-defined collection of objects.
class name 1. A label that is either unique to, or associated with, one or more devices
in the system's I/O configuration, used to reference a particular device
or class of devices. Device class names may be up to eight alphanumeric
characters long, beginning with a letter. A single logical device may
have multiple device class names. The HP 2680 Laser Printer, for
example, is referred to as EPOC (electro-photographic output for
computers), PP (page printer), or SLP (system line printer), or any other
defined name. Directing output to any of these class names sends the
output to a laser printer.
2. An abstract entity that can own objects in an HP SQL DBEnvironment.
clipping To restrict plotting or drawing to a rectangular portion (window) of the
total available area.
closing a file Terminating access to a file. A file is closed by calling the FCLOSE intrinsic
or terminating process execution.
cluster A physical storage organization method supported by DBCore that can
help minimize disk accesses. If a relation is clustered, the physical
placement of its rows is controlled by a key value; this key is called the
cluster index key.
COBOL Common business-oriented language. A high-level computer language
primarily used for business applications.
code Code consists of the executable instructions that make up a program or
subprogram.
code segment The instructions to the CPU contained in a single logical module; one or
more code segments comprise a complete program or subprogram. Code
segments remain unchanged during program execution, and may be
overwritten with a new code segment once the current segment has
executed completely. In this way, programs larger than the maximum code
segment size can execute without user intervention or a large amount of
memory.
code segment table (CST) A table that keeps track of all code segments currently being
used. CST is used only in compatibility mode (CM) on MPE XL.
cold dump See memory dump.
coldload See system load tape.
coldload tape See boot tape.
COLDSTART See UPDATE.
color palette In plotting terminology, a specific set of pen colors and line widths as
defined by the pen color instructions of the graphics system being used.
column A named collection of data in an HP SQL table or view with a particular