Air Cleaner User Manual

work. After the operation is complete, a new unit of
recovery or unit of work begins. Contrast with commit.
basic mapping support (BMS). An interface between
CICS and application programs that formats input and
output display data and routes multiple-page output
messages without regard for control characters used by
various terminals.
BMS. Basic mapping support.
bootstrap data set (BSDS). A VSAM data set that
contains:
v An inventory of all active and archived log data sets
known to MQSeries for OS/390
v A wrap-around inventory of all recent MQSeries for
OS/390 activity
The BSDS is required if the MQSeries for OS/390
subsystem has to be restarted.
browse. In message queuing, to use the MQGET call
to copy a message without removing it from the queue.
See also get.
browse cursor. In message queuing, an indicator used
when browsing a queue to identify the message that is
next in sequence.
BSDS. Bootstrap data set.
buffer pool. An area of main storage used for
MQSeries for OS/390 queues, messages, and object
definitions. See also page set.
C
call back. In MQSeries, a requester message channel
initiates a transfer from a sender channel by first calling
the sender, then closing down and awaiting a call back.
CCF. Channel control function.
CCSID. Coded character set identifier.
CDF. Channel definition file.
channel. See message channel.
channel control function (CCF). In MQSeries, a
program to move messages from a transmission queue
to a communication link, and from a communication
link to a local queue, together with an operator panel
interface to allow the setup and control of channels.
channel definition file (CDF). In MQSeries, a file
containing communication channel definitions that
associate transmission queues with communication
links.
channel event. An event indicating that a channel
instance has become available or unavailable. Channel
events are generated on the queue managers at both
ends of the channel.
checkpoint. A time when significant information is
written on the log. Contrast with syncpoint.In
MQSeries on UNIX systems, the point in time when a
data record described in the log is the same as the data
record in the queue. Checkpoints are generated
automatically and are used during the system restart
process.
CI. Control interval.
circular logging. In MQSeries on UNIX systems,
MQSeries for OS/2 Warp, and MQSeries for Windows
NT, the process of keeping all restart data in a ring of
log files. Logging fills the first file in the ring and then
moves on to the next, until all the files are full. At this
point, logging goes back to the first file in the ring and
starts again, if the space has been freed or is no longer
needed. Circular logging is used during restart
recovery, using the log to roll back transactions that
were in progress when the system stopped. Contrast
with linear logging.
CL. Control Language.
client. A run-time component that provides access to
queuing services on a server for local user applications.
The queues used by the applications reside on the
server. See also MQSeries client.
client application. An application, running on a
workstation and linked to a client, that gives the
application access to queuing services on a server.
client connection channel type. The type of MQI
channel definition associated with an MQSeries client.
See also server connection channel type.
cluster. A network of queue managers that are
logically associated in some way.
coded character set identifier (CCSID). The name of a
coded set of characters and their code point
assignments.
command. In MQSeries, an administration instruction
that can be carried out by the queue manager.
command prefix (CPF). In MQSeries for OS/390, a
character string that identifies the queue manager to
which MQSeries for OS/390 commands are directed,
and from which MQSeries for OS/390 operator
messages are received.
command processor. The MQSeries component that
processes commands.
Glossary
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MQSeries MQSC Command Reference