Air Cleaner User Manual

sending program waits for a reply to its message before
resuming its own processing. Contrast with
asynchronous messaging.
syncpoint. An intermediate or end point during
processing of a transaction at which the transaction’s
protected resources are consistent. At a syncpoint,
changes to the resources can safely be committed, or
they can be backed out to the previous syncpoint.
System Authorization Facility (SAF). An OS/390
facility through which MQSeries for OS/390
communicates with an external security manager such
as RACF.
system.command.input queue. A local queue on
which application programs can put MQSeries
commands. The commands are retrieved from the
queue by the command server, which validates them
and passes them to the command processor to be run.
system control commands. Commands used to
manipulate platform-specific entities such as buffer
pools, storage classes, and page sets.
system diagnostic work area (SDWA). Data recorded
in a SYS1.LOGREC entry, which describes a program or
hardware error.
system initialization table (SIT). A table containing
parameters used by CICS on start up.
SYS1.LOGREC. A service aid containing information
about program and hardware errors.
T
TACL. Tandem Advanced Command Language.
target library high-level qualifier (thlqual).
High-level qualifier for OS/390 target data set names.
task control block (TCB). An OS/390 control block
used to communicate information about tasks within an
address space that are connected to an OS/390
subsystem such as MQSeries for OS/390 or CICS.
task switching. The overlapping of I/O operations
and processing between several tasks. In MQSeries for
OS/390, the task switcher optimizes performance by
allowing some MQI calls to be executed under subtasks
rather than under the main CICS TCB.
TCB. Task control block.
temporary dynamic queue. A dynamic queue that is
deleted when it is closed. Temporary dynamic queues
are not recovered if the queue manager fails, so they
can contain nonpersistent messages only. Contrast with
permanent dynamic queue.
teraspace. In MQSeries for AS/400, a form of shared
memory introduced in OS/400 V4R4.
termination notification. A pending event that is
activated when a CICS subsystem successfully connects
to MQSeries for OS/390.
thlqual. Target library high-level qualifier.
thread. In MQSeries, the lowest level of parallel
execution available on an operating system platform.
time-independent messaging. See asynchronous
messaging.
TMI. Trigger monitor interface.
trace. In MQSeries, a facility for recording MQSeries
activity. The destinations for trace entries can include
GTF and the system management facility (SMF).
tranid. See transaction identifier.
transaction identifier. In CICS, a name that is
specified when the transaction is defined, and that is
used to invoke the transaction.
transmission program. See message channel agent.
transmission queue. A local queue on which prepared
messages destined for a remote queue manager are
temporarily stored.
trigger event. An event (such as a message arriving
on a queue) that causes a queue manager to create a
trigger message on an initiation queue.
triggering. In MQSeries, a facility allowing a queue
manager to start an application automatically when
predetermined conditions on a queue are satisfied.
trigger message. A message containing information
about the program that a trigger monitor is to start.
trigger monitor. A continuously-running application
serving one or more initiation queues. When a trigger
message arrives on an initiation queue, the trigger
monitor retrieves the message. It uses the information
in the trigger message to start a process that serves the
queue on which a trigger event occurred.
trigger monitor interface (TMI). The MQSeries
interface to which customer- or vendor-written trigger
monitor programs must conform. A part of the
MQSeries Framework.
two-phase commit. A protocol for the coordination of
changes to recoverable resources when more than one
resource manager is used by a single transaction.
Contrast with single-phase commit.
U
UIS. User identifier service.
undelivered-message queue. See dead-letter queue.
Glossary
Glossary of terms and abbreviations 301