There are queues other than application queues that you might want to consider sharing:
If you define a shared initiation queue, you do not need to have a trigger monitor running on every queue manager in the queue-sharing group, as long as there is at least one trigger monitor running. (You can also use a shared initiation queue even if there is a trigger monitor running on each queue manager in the queue-sharing group.)
If you have a shared application queue and use the trigger type of EVERY (or a trigger type of FIRST with a small trigger interval, which behaves like a trigger type of EVERY) your initiation queue must always be a shared queue. For more information about when to use a shared initiation queue, see Table 12.
You must define the SYSTEM.QSG.* queues used for shared channels and intra-group queuing as shared queues.
You can also change the definitions of the SYSTEM.DEFAULT.LOCAL.QUEUE to be shared, or define your own default shared queue definition. This is described in the section Defining system objects in the WebSphere MQ for z/OS Concepts and Planning Guide.
You cannot define any other SYSTEM.* queues as shared queues.
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