2.7. VSAM performance by scenarios
Here, we simulate a scenario, where one or more VSAM data sets are causing performance problems to key transactions in a real installation. We cover all the aspects that may affect the VSAM I/O delay time, (Tw(IO)); and the I/O service time, (Ts(IO)). Also, because VSAM CPU service time, (Ts(CPU)), which is used by VSAM, has some effect on the total response time, we offer suggestions on how to decrease it.
2.7.1. Performance scenario using RMF reports
Before we start let us say a few words about RMF™.
RMF is an IBM program product which measures z/OS system performance. RMF has three Monitors and a Postprocessor function.
Each Monitor has a Data Gatherer and a Data Reporter. For Monitor I and Monitor II, ...
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