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ABCs of z/OS System Programming Volume 8 by Peter Hilger, Paul Rogers

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z/OS trace processing
Another useful source of diagnostic data is the trace. Tracing collects information that identifies ongoing events that occur over a period of time. Some traces are running all the time so that trace data will be available in the event of a failure. Other traces must be explicitly started to trace a defined event.
In this chapter, the following trace activity is described:
GTF trace
Component trace
Master trace
GFS trace
System trace
SMS tracing
5.1 z/OS trace facilities
Figure 5-1 z/OS trace facilities
GTF trace facility ...

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