Air Cleaner User Manual

command server. The MQSeries component that reads
commands from the system-command input queue,
verifies them, and passes valid commands to the
command processor.
commit. An operation that applies all the changes
made during the current unit of recovery or unit of
work. After the operation is complete, a new unit of
recovery or unit of work begins. Contrast with backout.
completion code. A return code indicating how an
MQI call has ended.
configuration file. In MQSeries on UNIX systems,
MQSeries for AS/400, MQSeries for OS/2 Warp, and
MQSeries for Windows NT, a file that contains
configuration information related to, for example, logs,
communications, or installable services. Synonymous
with .ini file. See also stanza.
connect. To provide a queue manager connection
handle, which an application uses on subsequent MQI
calls. The connection is made either by the MQCONN
or MQCONNX call, or automatically by the MQOPEN
call.
connection handle. The identifier or token by which a
program accesses the queue manager to which it is
connected.
context. Information about the origin of a message.
context security. In MQSeries, a method of allowing
security to be handled such that messages are obliged
to carry details of their origins in the message
descriptor.
control command. In MQSeries on UNIX systems,
MQSeries for OS/2 Warp, and MQSeries for Windows
NT, a command that can be entered interactively from
the operating system command line. Such a command
requires only that the MQSeries product be installed; it
does not require a special utility or program to run it.
control interval (CI). A fixed-length area of direct
access storage in which VSAM stores records and
creates distributed free spaces. The control interval is
the unit of information that VSAM transmits to or from
direct access storage.
Control Language (CL). In MQSeries for AS/400, a
language that can be used to issue commands, either at
the command line or by writing a CL program.
controlled shutdown. See quiesced shutdown.
CPF. Command prefix.
coupling facility. On OS/390, a special logical
partition that provides high-speed caching, list
processing, and locking functions in a parallel sysplex.
D
DAE. Dump analysis and elimination.
data conversion interface (DCI). The MQSeries
interface to which customer- or vendor-written
programs that convert application data between
different machine encodings and CCSIDs must
conform. A part of the MQSeries Framework.
datagram. The simplest message that MQSeries
supports. This type of message does not require a reply.
DCE. Distributed Computing Environment.
DCI. Data conversion interface.
dead-letter queue (DLQ). A queue to which a queue
manager or application sends messages that it cannot
deliver to their correct destination.
dead-letter queue handler. An MQSeries-supplied
utility that monitors a dead-letter queue (DLQ) and
processes messages on the queue in accordance with a
user-written rules table.
default object. A definition of an object (for example,
a queue) with all attributes defined. If a user defines an
object but does not specify all possible attributes for
that object, the queue manager uses default attributes
in place of any that were not specified.
deferred connection. A pending event that is activated
when a CICS subsystem tries to connect to MQSeries
for OS/390 before MQSeries for OS/390 has been
started.
distributed application. In message queuing, a set of
application programs that can each be connected to a
different queue manager, but that collectively constitute
a single application.
Distributed Computing Environment (DCE).
Middleware that provides some basic services, making
the development of distributed applications easier. DCE
is defined by the Open Software Foundation (OSF).
distributed queue management (DQM). In message
queuing, the setup and control of message channels to
queue managers on other systems.
DLQ. Dead-letter queue.
DQM. Distributed queue management.
dual logging. A method of recording MQSeries for
OS/390 activity, where each change is recorded on two
data sets, so that if a restart is necessary and one data
set is unreadable, the other can be used. Contrast with
single logging.
dual mode. See dual logging.
Glossary
Glossary of terms and abbreviations 293
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