The CICS® virtual storage tuning process consists of
several steps that you should take in the following order:
- Understand the contents of the CICS address
space. To determine what is good or bad in your system, you must
first fully understand the contents of the CICS address
space and what components of the system affect the size of each of
the areas. See Appendix F. MVS and CICS virtual
storage for a description of the CICS address
space.
- Measure the CICS address space using one of the
following tools to determine the approximate sizes of each of the
areas:
- CICS formatted dump (loader domain and storage
domain only) to look at the CICS region
- CICS storage statistics
- The sample statistics program (DFH0STAT) to provide selected statistical
information for estimating the size of your DSAs.
- Using the results of the above measurements, determine if each
of the areas of the CICS address space is within the expected
sizes and select the areas that seem to be the most out of line from
your expectations. Concentrate on these items; do not waste time
on areas that represent only a small amount of storage improvement.
- Evaluate the guidance given in this section to see whether it
is applicable to your installation.

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