DefClusterXmitQueueType (MQLONG)

The DefClusterXmitQueueType attribute controls which transmission queue is selected by default by cluster-sender channels to get messages from, to send the messages to cluster-receiver channels.

The values of DefClusterXmitQueueType are MQCLXQ_SCTQ or MQCLXQ_CHANNEL.

    MQCLXQ_SCTQ

    All cluster-sender channels send messages from SYSTEM.CLUSTER.TRANSMIT.QUEUE. The correlID of messages placed on the transmission queue identifies which cluster-sender channel the message is destined for.

    SCTQ is set when a queue manager is defined. This behavior is implicit in versions of IBM WebSphere MQ, earlier than Version 7.5. In earlier versions, the queue manager attribute DefClusterXmitQueueType was not present.

    MQCLXQ_CHANNEL
    Each cluster-sender channel sends messages from a different transmission queue. Each transmission queue is created as a permanent dynamic queue from the model queue SYSTEM.CLUSTER.TRANSMIT.MODEL.QUEUE.

If the queue manager attribute, DefClusterXmitQueueType, is set to CHANNEL, the default configuration is changed to cluster-sender channels being associated with individual cluster transmission queues. The transmission queues are permanent-dynamic queues created from the model queue SYSTEM.CLUSTER.TRANSMIT.MODEL.QUEUE. Each transmission queue is associated with one cluster-sender channel. As one cluster-sender channel services a cluster transmission queue, the transmission queue contains messages for only one queue manager in one cluster. We can configure clusters so that each queue manager in a cluster contains only one cluster queue. In this case, the message traffic from a queue manager to each cluster queue is transferred separately from messages to other queues.

To query the value, call MQINQ, or send an Inquire Queue Manager ( MQCMD_INQUIRE_Q_MGR) PCF command, setting the MQIA_DEF_CLUSTER_XMIT_Q_TYPE selector. To change the value, send a Change Queue Manager ( MQCMD_CHANGE_Q_MGR) PCF command, setting the MQIA_DEF_CLUSTER_XMIT_Q_TYPE selector.


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