Queue definition commands
Cluster attributes that can be specified on the queue definition commands.
The DEFINE QLOCAL, DEFINE QREMOTE, and DEFINE QALIAS commands
The cluster attributes on the DEFINE QLOCAL, DEFINE QREMOTE, and DEFINE QALIAS commands, and the three equivalent ALTER commands, are:
- CLUSTER
- Specifies the name of the cluster to which the queue belongs.
- CLUSNL
- Specifies a namelist of cluster names.
- DEFBIND
- Specifies the binding to be used when an application specifies MQOO_BIND_AS_Q_DEF on the MQOPEN call. The options for this attribute are:
- Specify DEFBIND(OPEN) to bind the queue handle to a specific instance of the cluster queue when the queue is opened. DEFBIND(OPEN) is the default for this attribute.
- Specify DEFBIND(NOTFIXED) so that the queue handle is not bound to any instance of the cluster queue.
- Specify DEFBIND(GROUP) to allow an application to request that a group of messages are all allocated to the same destination instance.
When multiple queues with the same name are advertised in a Queue Manager Cluster, applications can choose whether to send all messages from this application to a single instance (MQOO_BIND_ON_OPEN), to allow the workload management algorithm to select the most suitable destination on a per message basis (MQOO_BIND_NOT_FIXED), or allow an application to request that a 'group' of messages be all allocated to the same destination instance (MQOO_BIND_ON_GROUP). The workload balancing is re-driven between groups of messages (without requiring an MQCLOSE and MQOPEN of the queue).
- CLWLRANK
- Applies a ranking factor to a queue for workload management purposes. CLWLRANK parameter is not supported on model queues. The cluster workload algorithm selects a destination queue with the highest rank. By default CLWLRANK for all queues is set to zero.
- CLWLPRTY
- Applies a priority factor to a queue for workload management purposes. The cluster workload algorithm selects a destination queue with the highest priority. By default priority for all queues is set to zero.
- CLWLUSEQ
- Specifies the behavior of an MQPUT operation for a queue. This parameter specifies the behavior of an MQPUT operation when the target queue has a local instance and at least one remote cluster instance (except where the MQPUT originates from a cluster channel). This parameter is only valid for local queues.
The DISPLAY QUEUE and DISPLAY QCLUSTER commands
The attributes on the DEFINE QLOCAL, DEFINE QREMOTE, and DEFINE QALIAS commands also apply to the DISPLAY QUEUE command.
To display information about cluster queues, specify a queue type of QCLUSTER or the keyword CLUSINFO on the DISPLAY QUEUE command, or use the command DISPLAY QCLUSTER.
The DISPLAY QUEUE or DISPLAY QCLUSTER command returns the name of the queue manager that hosts the queue (or the names of all queue managers if there is more than one instance of the queue). It also returns the system name for each queue manager that hosts the queue, the queue type represented, and the date and time at which the definition became available to the local queue manager. This information is returned using the CLUSQMGR, QMID, CLUSQT, CLUSDATE, and CLUSTIME attributes.
The system name for the queue manager ( QMID ), is a unique, system-generated name for the queue manager.
We can define a cluster queue that is also a shared queue. For example. on z/OS we can define:DEFINE QLOCAL(MYQUEUE) CLUSTER(MYCLUSTER) QSGDISP(SHARED) CFSTRUCT(STRUCTURE)The equivalent PCFs are MQCMD_CHANGE_Q, MQCMD_COPY_Q, MQCMD_CREATE_Q, and MQCMD_INQUIRE_Q.
Parent topic: IBM MQ cluster commands
Related concepts
Related reference
- Queue manager definition commands
- Channel definition commands
- DISPLAY CLUSQMGR
- SUSPEND QMGR, RESUME QMGR and clusters
- REFRESH CLUSTER
- RESET CLUSTER