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When is historical data recorded?

If you have allocated historical data sets, historical reporting begins as soon as the PAS is initialized.

For CMF MONITOR and MainView for z/OS, data is written into the historical data sets at the same rate that performance data is recorded by the CMF MONITOR Extractor. That is, if the Extractor interval is set to 30 minutes, data is written to the historical database every 30 minutes as well. (You specify the Extractor rate on the REPORT statement in the CMFCPMxx or CMFIPMxx control member.)

For CMF MONITOR and MainView for z/OS, if IPM recording becomes active for the Extractor, the historical recorder uses the IPM rate, not the CPM rate. This change can result in interval rates of 5- or 10-minute increments and can impact data usage when viewing multiple intervals of historical data in a view.

Note

If long-term data collection is activated in MainView for z/OS, data is written to the second historical database at a rate that is some multiple of the regular interval described here. For information about how the long-term interval is specified, see Customizing after installation.

If short-term data collection is activated in MainView for z/OS version 3.0.00 or later and CMF MONITOR version 5.8.00 or later, data is written to another historical database at a rate of once every 15, 30, or 60 seconds.

For products that execute in the BBI-SS PAS (MainView AutoOPERATOR, MainView for CICS, MainView for DB2, MainView for DBCTL, MainView for IMS Online, and MainView for MQ), data is recorded at the interval that is specified with the IRRI parameter in BBPARM member BBIISP00. If the IRRI parameter is not specified in BBIISP00, the default length of the recording interval is 15 minutes.

Intervals are usually synchronized on the hour. For example, if an interval is defined as 15 minutes and extraction begins at 7:49 A.M., the first interval lasts 11 minutes until the hour of 8:00 A.M. is reached. From then on, the intervals are 8:00 to 8:15, 8:15 to 8:30, and so on .

Related topic

Understanding the historical database


 

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