Tuning CICS virtual storage

The CICS® virtual storage tuning process consists of several steps that you should take in the following order:

  1. 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.
  2. Measure the CICS address space using one of the following tools to determine the approximate sizes of each of the areas:
  3. 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.
  4. Evaluate the guidance given in this section to see whether it is applicable to your installation.

Related tasks
Virtual and real storage: performance considerations
Splitting online systems: virtual storage
Setting the maximum task specification (MXT)
Using transaction classes (MAXACTIVE) to control transactions
Specifying a transaction class purge threshold (PURGETHRESH)
Prioritizing tasks
Adjusting the limits for dynamic storage areas
Using modules in the link pack area (LPA/ELPA)
Choosing aligned or unaligned maps
Defining programs as resident, nonresident, or transient
Putting application programs above the 16MB line
Allocating real storage when using transaction isolation
Limiting the expansion of subpool 229 using VTAM pacing
[[ Contents Previous Page | Next Page Index ]]