Statistics utility program (DFHSTUP)

This section provides a general overview of the collection of CICS® statistics as well as describing the operation of the offline statistics utility program (DFHSTUP). For more information about using the DFHSTUP utility program, see the CICS Operations and Utilities Guide.

An operator interface to all online statistics functions is provided by the CEMT transaction. The equivalent programmable interface is provided by the EXEC API.

Statistics may be collected at user-specified intervals from the startup to the shutdown of a CICS system. Statistics may also be requested, resulting in the collection of data for the period between the last time statistics were reset and the time the request was made.

Statistics are also collected at system quiesce or logical end of day; this data is written to the SMF data set as for a normal interval collection.

An option is provided by the statistics domain to allow the user to specify whether interval statistics are to be collected. The statistics domain calls each domain in turn to reset the statistics fields at every interval when statistics are collected. Statistics (particularly interval statistics) can be used for capacity planning and performance tuning. For further information about this aspect, see the CICS Performance Guide.

There is a great similarity between CICS statistics data and CICS performance class monitoring data. Statistics data is collected on a resource basis, whereas performance class monitoring collects similar data on a transaction basis. Statistics can therefore be viewed as resource monitoring.

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