Properties of temporary dynamic queues

 

Temporary dynamic queues have the following properties:

• They cannot be shared queues, accessible from queue managers in a queue-sharing group (only available on WebSphere MQ for z/OS).

• They hold nonpersistent messages only.

• They are non-recoverable.

• They are deleted when the queue manager is started.

• They are deleted when the application that issued the MQOPEN call that created the queue closes the queue or terminates.

  • If there are any committed messages on the queue, they are deleted.

  • If there are any uncommitted MQGET, MQPUT, or MQPUT1 calls outstanding against the queue at this time, the queue is marked as being logically deleted, and is only physically deleted (after these calls have been committed) as part of close processing, or when the application terminates.

  • If the queue is in use at this time (by the creating, or another application), the queue is marked as being logically deleted, and is only physically deleted when closed by the last application using the queue.

  • Attempts to access a logically deleted queue (other than to close it) fail with reason code MQRC_Q_DELETED.

  • MQCO_NONE, MQCO_DELETE and MQCO_DELETE_PURGE are all treated as MQCO_NONE when specified on an MQCLOSE call for the corresponding MQOPEN call that created the queue.

 

Parent topic:

Dynamic queues

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