2.2. Transaction performance
A transaction is a business unit of work produced by an online or batch interaction with an end user or a department with the system. It can be a CICS, TSO, a WEB, an APPC, distributed DB2, or even a batch interaction. If your MVS is in Workload Manager (WLM) goal mode, all these transactions are monitored and accounted for by z/OS.
To characterize the performance of a transaction, we need to understand its different response time components. Figure 2-1 shows general response time components, where:
Figure 2-1. Response time components
Tr = Ts + Tw
Ts is Service Time, Tw is Waiting Time (also called queue time), ...
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