IBM SC33-1683-02 - Manual (Page 709)

Chapter 25. CICS statistics
This chapter is divided into the following sections:
1. “Introduction to CICS statistics” describes the types of statistics data, and
the use of the EXEC CICS COLLECT STATISTICS command.
2. “CICS statistics record format” on page 682 describes the format of CICS
statistics SMF type 110 records.
3. “Global user exit in the CICS statistics domain” on page 687 suggests ways
in which you can use the XSTOUT statistics exit.
4. “Processing the output from CICS statistics” on page 688 lists the methods
of processing statistics data.
Introduction to CICS statistics
CICS statistics contain information about the CICS system as a whole—for
example, its performance and usage of resources. Statistics data is therefore useful
both for performance tuning and for capacity planning.
Statistics are collected during CICS online processing for later offline analysis. The
statistics domain writes statistics records to a System Management Facility (SMF)
data set. The records are of SMF type 110, subtype 0002.
11
Statistics records are also written by:
v Temporary storage (TS) data sharing pool server regions. These records are of
SMF type 110, subtype 0003.
v Coupling facility data table (CFDT) server regions. These records are of SMF
type 110, subtype 0004.
v Named counter sequence number server regions. These records are of SMF
type 110, subtype 0005.
Types of statistics data
CICS produces five types of statistics: interval, end-of-day, requested, requested
reset, and unsolicited. The TS data sharing server only produces interval and
end-of-day statistics.
Interval statistics
are gathered by CICS during a specified interval. CICS writes the interval
statistics to the SMF data set automatically at the expiry of that interval if:
v Statistics recording status was set ON by the STATRCD system initialization
parameter (and has not subsequently been set OFF by a CEMT SET
STATISTICS or EXEC CICS SET STATISTICS RECORDING command). The
default value of STATRCD is OFF.
or
v ON is specified on CEMT SET STATISTICS.
11. Monitoring records, and statistics records produced by the temporary storage shared-queue server, are also written to the SMF
data set as type 110 records. (Some journaling type 110 records can be written there, too.) You might find it useful to process the
statistics records and the monitoring records together, because statistics provide resource and system information that is
complementary to the transaction data produced by CICS monitoring.
© Copyright IBM Corp. 1977, 1999 677
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