Monitor queues

Monitor queues

Use this page to view tasks that help you to resolve a problem with a queue and the application that services that queue. Various monitoring options are available to determine the problem

Frequently, the first sign of a problem with a queue that is being serviced is that the number of messages on the queue (CURDEPTH) increases. If you expect an increase at certain times of day or under certain workloads, an increasing number of messages might not indicate a problem. However, if we have no explanation for the increasing number of messages, you might want to investigate the cause.

You might have an application queue where there is a problem with the application, or a transmission queue where there is a problem with the channel. Additional monitoring options are available when the application that services the queue is a channel.

The following examples investigate problems with a particular queue, called Q1, and describe the fields that you look at in the output of various commands:

Determining whether our application has the queue open
If we have a problem with a queue, check whether our application has the queue open
Checking that messages on the queue are available
If we have a large number of messages on the queue and our application is not processing any of those messages, check whether the messages on the queue are available to our application
Checking whether our application is getting messages off the queue
If we have a problem with a queue and the application that services that queue, check whether our application is getting messages off the queue
Determining whether the application can process messages fast enough
If messages are building up on the queue, but your other checks have not found any processing problems, check that the application can process messages fast enough. If the application is a channel, check that the channel can process messages fast enough.
Checking the queue when the current depth is not increasing
Even if the current depth of your queue is not increasing, it might still be useful to monitor the queue to check whether our application is processing messages correctly.
Parent topic: Real-time monitoring