Properties of permanent dynamic queues

 

Permanent dynamic queues have the following properties:

• They hold persistent or nonpersistent messages.

• They are recoverable in the event of system failures.

• They are deleted when an application (not necessarily the one that issued the MQOPEN call that created the queue) successfully closes the queue using the MQCO_DELETE or MQCO_DELETE_PURGE option.

  • A close request with the MQCO_DELETE option fails if there are any messages (committed or uncommitted) still on the queue. A close request with the MQCO_DELETE_PURGE option succeeds even if there are committed messages on the queue (the messages being deleted as part of the close), but fails if there are any uncommitted MQGET, MQPUT, or MQPUT1 calls outstanding against the queue.

  • If the delete request is successful, but the queue happens to be in use (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.

• They are not deleted if closed by an application that is not authorized to delete the queue, unless the closing application issued the MQOPEN call that created the queue. Authorization checks are performed against the user identifier (or alternate user identifier if MQOO_ALTERNATE_USER_AUTHORITY was specified) that was used to validate the corresponding MQOPEN call.

• They can be deleted in the same way as a normal queue.

 

Parent topic:

Dynamic queues

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