normal conditions. They should, nevertheless, be tested as far as possible, to ensure that they handle the functions for which they are designed.

CICS facilities, such as the execution diagnostic facility (CEDF) and command interpreter (CECI), can help to create exception conditions and to interpret program and system reactions to those conditions.

The ability of the installed CICS system, application programs, operators, and terminal users to cope with exception conditions depends on the designer and the implementer being able to:

vForecast the exceptional conditions that can be expected

vDocument what operators and users should do in the process of recovery, and include escape procedures for problems or errors that persist

Conditions that need documented procedures include:

vPower failure in the processor

vFailure of CICS

vPhysical failure of data set(s)

vTransaction abends

vCommunication failures—such as the loss of telephone lines, or a printer being out of service

vShunted units of work, caused by communication or backout failures

It is essential that recovery and restart procedures are tested and rehearsed in a controlled environment by everyone who might have to cope with a failure. This is especially important in installations that have temporary operators.

106CICS TS for z/OS 4.1: Recovery and Restart Guide

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IBM SC34-7012-01 manual Cics TS for z/OS 4.1 Recovery and Restart Guide