Air Cleaner User Manual

locally-defined object. On OS/390, an object whose
definition is stored on page set zero. The definition can
be accessed only by the queue manager that defined it.
Also known as a privately-defined object.
log. In MQSeries, a file recording the work done by
queue managers while they receive, transmit, and
deliver messages, to enable them to recover in the
event of failure.
log control file. In MQSeries on UNIX systems,
MQSeries for OS/2 Warp, and MQSeries for Windows
NT, the file containing information needed to monitor
the use of log files (for example, their size and location,
and the name of the next available file).
log file. In MQSeries on UNIX systems, MQSeries for
OS/2 Warp, and MQSeries for Windows NT, a file in
which all significant changes to the data controlled by a
queue manager are recorded. If the primary log files
become full, MQSeries allocates secondary log files.
logical unit of work (LUW). See unitofwork.
M
machine check interrupt. An interruption that occurs
as a result of an equipment malfunction or error. A
machine check interrupt can be either hardware
recoverable, software recoverable, or nonrecoverable.
MCA. Message channel agent.
MCI. Message channel interface.
media image. In MQSeries on UNIX systems,
MQSeries for OS/2 Warp, and MQSeries for Windows
NT, the sequence of log records that contain an image
of an object. The object can be recreated from this
image.
message. In message queuing applications, a
communication sent between programs. In system
programming, information intended for the terminal
operator or system administrator.
message channel. In distributed message queuing, a
mechanism for moving messages from one queue
manager to another. A message channel comprises two
message channel agents (a sender at one end and a
receiver at the other end) and a communication link.
Contrast with MQI channel.
message channel agent (MCA). A program that
transmits prepared messages from a transmission
queue to a communication link, or from a
communication link to a destination queue. See also
message queue interface.
message channel interface (MCI). The MQSeries
interface to which customer- or vendor-written
programs that transmit messages between an MQSeries
queue manager and another messaging system must
conform. A part of the MQSeries Framework.
message descriptor. Control information describing
the message format and presentation that is carried as
part of an MQSeries message. The format of the
message descriptor is defined by the MQMD structure.
message priority. In MQSeries, an attribute of a
message that can affect the order in which messages on
a queue are retrieved, and whether a trigger event is
generated.
message queue. Synonym for queue.
message queue interface (MQI). The programming
interface provided by the MQSeries queue managers.
This programming interface allows application
programs to access message queuing services.
message queuing. A programming technique in which
each program within an application communicates with
the other programs by putting messages on queues.
message sequence numbering. A programming
technique in which messages are given unique numbers
during transmission over a communication link. This
enables the receiving process to check whether all
messages are received, to place them in a queue in the
original order, and to discard duplicate messages.
messaging. See synchronous messaging and asynchronous
messaging.
model queue object. A set of queue attributes that act
as a template when a program creates a dynamic
queue.
MQAI. MQSeries Administration Interface.
MQI. Message queue interface.
MQI channel. Connects an MQSeries client to a queue
manager on a server system, and transfers only MQI
calls and responses in a bidirectional manner. Contrast
with message channel.
MQSC. MQSeries commands.
MQSeries. A family of IBM licensed programs that
provides message queuing services.
MQSeries Administration Interface (MQAI). A
programming interface to MQSeries.
MQSeries client. Part of an MQSeries product that
can be installed on a system without installing the full
queue manager. The MQSeries client accepts MQI calls
from applications and communicates with a queue
manager on a server system.
MQSeries commands (MQSC). Human readable
commands, uniform across all platforms, that are used
to manipulate MQSeries objects.
Glossary
296
MQSeries MQSC Command Reference
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