Performance checklists

The following checklists provide a quick reference to options that you can adjust to relieve different constraints. They assume that you have identified the exact cause of an existing constraint; they should not be used for random tuning exercises.

There are four checklists, corresponding to four of the main contention areas described in Identifying CICS constraints.

  1. I/O contention -- this applies to data set and database subsystems, as well as to the data communications network (see Input/output contention performance checklist)
  2. Virtual storage above and below the 16MB line (see Virtual storage above and below 16MB line performance checklist)
  3. Real storage (see Real storage performance checklist)
  4. Processor cycles (see Processor cycles performance checklist).

The checklists are in the sequence of low-level to high-level resources, and the items are ordered from those that probably have the greatest effect on performance to those that have a lesser effect, from the highest likelihood of being a factor in a normal system to the lowest, and from the easiest to the most difficult to implement.

Before taking action on a particular item, you should review the item to:

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