Dealing with performance problems on z/OS

Use this topic to investigate performance problems in more detail.

Performance problems are characterized by the following:

Poor response times in online transactions
Batch jobs taking a long time to complete
The transmission of messages is slow

Performance problems can be caused by many factors, from a lack of resource in the z/OS® system as a whole, to poor application design.

The following topics present problems and suggested solutions, starting with problems that are relatively simple to diagnose, such as DASD contention, through problems with specific subsystems, such as IBM® MQ and CICS® or IMS.

IBM MQ for z/OS system considerations
CICS constraints
Dealing with applications that are running slowly or have stopped on z/OS

Remote queuing problems can be due to network congestion and other network problems. They can also be caused by problems at the remote queue manager.