Manage group objects

Use this topic to understand how to work with group objects.

IBM MQ automatically copies the definition of a group object to page set zero of each queue manager that uses it. We can alter the copy of the definition temporarily, and IBM MQ allows you to refresh the page set copies from the repository copy. IBM MQ always tries to refresh the page set copies from the repository copy on start-up (for channel objects, this is done when the channel initiator restarts). This ensures that the page set copies reflect the version on the repository, including any changes that were made when the queue manager was inactive.

There are circumstances under which the refresh is not performed, for example:

• If a copy of the queue is open, a refresh that would change the usage of the queue fails.
• If a copy of a queue has messages on it, a refresh that would delete that queue fails.

In these circumstances, the refresh is not performed on that copy, but is performed on the copies on all other queue managers. Check for and correct any problems with copy objects after adding, changing, or deleting a group object, and at queue manager or channel initiator restart.

Parent topic: Manage queue sharing groups and shared queues on z/OS