Dealing with performance problems

 

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

They can be caused by many factors, from a lack of resource in the z/OS system as a whole, to poor application design. This chapter presents problems and suggested solutions, starting with problems that are relatively simple to diagnose, such as DASD contention, through problems with specific subsystems, such as WebSphere MQ and CICS or IMS, and ending with the more subtle problems of application design, which might take more detecting.

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.