Is the problem intermittent or does the problem occur with all z/OS, CICS, or IMS systems?

Review this topic to consider if problems are caused by application interaction or are related to other z/OS systems.

An intermittent problem could be caused by failing to take into account the fact that processes can run independently of each other. For example, a program might issue an MQGET call, without specifying WAIT, before an earlier process has completed. We might also encounter this type of problem if the application tries to get a message from a queue while it is in sync point (that is, before it has been committed).

If the problem only occurs when you access a particular z/OS, IMS, or CICS system, consider what is different about this system. Also consider whether any changes have been made to the system that might affect the way it interacts with IBM MQ .

Parent topic: Making initial checks on z/OS