Starting and stopping CICS

This is information about how CICS® starts and stops, the implications of different types of start and stop, and the actions you must take to handle them.

The types of CICS startup
CICS can start in several ways. There are four types of CICS startup: initial start, cold start, warm start, and emergency start.
The types of CICS shutdown
There are three types of CICS system shutdown - normal, immediate, and uncontrolled. Normal shutdown involves quiesce processing. In comparison, immediate shutdown is accomplished by termination processing.
Managing CICS shutdown
You can initiate a normal or immediate shutdown of CICS. In a normal shutdown, CICS performs a controlled sequence of operations that leave the system in a well-defined state; existing tasks are allowed to finish. In an immediate shutdown, CICS remains in overall control, but it does a minimum amount of processing so the system can terminate rapidly; existing tasks are not allowed to finish, and could abend.
CICS warm-up and cool-down, facilitated by z/OS Workload Manager health service
With z/OS® Workload Manager (z/OS WLM) health service, you can enable CICS to have a warm-up process after the end of system initialization to control flow of work into the region until the region is fully ready to receive work. You can also enable CICS to have a cool-down process before system shutdown to limit flow of work into the region.

Parent topic: Administering CICS

Related information

Administering restart and recovery