Is our application or system running slowly?

If our application is running slowly, it might be in a loop, or waiting for a resource that is not available, or there might be a performance problem.

Perhaps your system is operating near the limits of its capacity. This type of problem is probably worst at peak system load times, typically at mid-morning and mid-afternoon. (If your network extends across more than one time zone, peak system load might seem to occur at some other time.)

A performance problem might be caused by a limitation of your hardware.

If you find that performance degradation is not dependent on system loading, but happens sometimes when the system is lightly loaded, a poorly-designed application program is probably to blame. This could appear to be a problem that only occurs when certain queues are accessed.

If the performance issue persists, the problem might lie with IBM MQ itself. If you suspect this, contact your IBM Support Center for help.

A common cause of slow application performance, or the build up of messages on a queue (usually a transmission queue) is one or more applications that write persistent messages outside a unit of work; for more information, see Message persistence.