Most performance problems appear as unacceptable response times
or resource usage. For example, system processing is slow because
a program is using an excessive amount of system resources.
Symptoms of a performance problem:- Jobs take more time to execute than normal
- Poor or erratic response time exists
- Service level objectives are being exceeded
- Users complain about slow response time
- Unexpected changes occur in response times or resource utilizations
- Other indicators show stress
- Monitor III Workflow/Exceptions occur.
- System resource indicators occur (for example, paging rates, DASD
response)
- Expected throughput on the system is not being attained
- CP utilization for a job or address space is higher than normal.