To minimize performance analysis problems, the following procedure should be adhered to:
Define the performance expectations (see "Performance expectations of the user").
Check the extent to which performance expectations are satisfied once productive operation has begun. This involves carrying out a “basis” test.
If some performance expectations are not satisfied, check whether these are systemoriented or user-oriented.
Check for errors in the system setup.
Carry out a bottleneck analysis (see the section "Automatic performance analysis" and the description of the START-AUTOMATIC-ANALYSIS statement).
Concentrate on those bottlenecks whose elimination promises the greatest performance improvement.After eliminating the detected bottlenecks, repeat the bottleneck analysis. Many bottlenecks remain hidden until after some kind of intervention.
Monitor the system at regular intervals (see "Applications") to detect saturation symptoms in the main resources (due to increasing loads) and to avoid critical system conditions.
The procedure is described in detail in the “Performance Handbook” [5], which also explains how to interpret the results.