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MainView for z/OS
What is the purpose of the SYST data collector?
If SYST is turned off at the beginning of an interval, all fields reflecting SRM activity, system-wide statistics, or systemwide constants either are blank or contain zeros. If SYST is turned off in the middle of an interval, these fields contain invalid data.
More information on the SYST data collector such as what views are affected can be found in our MainView for z/OS User Guide and Reference manual, under z/OS data collectors (page 103):