Shared queues

Queues can be non-shared, owned by and accessible to only one queue manager, or shared, owned by a queue-sharing group. A queue-sharing group consists of a number of queue managers, running within a single z/OS sysplex, that can access the same WebSphere MQ object definitions and message data concurrently. Within a queue-sharing group, the shareable object definitions are stored in a shared DB2 database, and the messages are held inside one or more Coupling Facility structures (CF structures), and in the shared DB2 database. The shared DB2 database and the Coupling Facility structures are resources that are owned by several queue managers.