Distribution of queues on Coupling Facility structures

The distribution of queues on Coupling Facility structures can have an impact on performance.

A queue-sharing group can connect to up to 64 Coupling Facility structures, one of which must be the administration structure. We can use the remaining 63 Coupling Facility structures for WebSphere MQ data with each structure holding up to 512 queues. If we need more than one Coupling Facility structure, separate the queues across several structures based on the queues' function.

There are some steps we can take to maximize efficiency:

• Delete any Coupling Facility structures you no longer require.

• Place all the queues used by an application on the same Coupling Facility to make application processing efficient.

• If work is particularly performance sensitive, choose a faster Coupling Facility structure.

Consider that if you lose a Coupling Facility structure, you lose any non-persistent messages stored in it. This can cause consistency problems if queues are spread across various Coupling Facility structures. To use persistent messages, define the Coupling Facility structures with at least CFLEVEL(3) and RECOVER(YES).