Important
- For brevity, in this section, the terms CICS® Transaction Server for z/OS® and CICS TS z/OS are used to mean all the following CICS products:
CICS Transaction Server for z/OS Version 3 Release 1
- CICS Transaction Server for z/OS, Version 2 Release 3
- CICS Transaction Server for z/OS, Version 2 Release 2
- CICS Transaction Server for OS/390, Version 1 Release 3
- In this section, the terms "unit of work" and "UOW" mean
a local unit of work--that is, that
part of a distributed unit of work that relates to resources on the local system.
The system programming and CEMT commands and the CICS messages described
later in the section return information about local UOWs.
Where
a distributed unit of work is meant, the term is used explicitly.
This section introduces a number of new terms, such as in-doubt, initiator, agent, coordinator, subordinate, shunted, and resynchronization. These terms are explained as they occur in the text, with examples.
You may also find it useful to refer to the CICS glossary.
The rest of the section contains the following sections:
- Syncpoint exchanges gives examples of CICS syncpoint flows, and explains
the terms used to describe them.
- Recovery functions and interfaces describes the ways in which CICS can recover from
a communication failure, and the commands you can use to control CICS recovery
actions. Note that this and the next two sections apply only to MRO and APPC
parallel-session connections to other CICS Transaction Server for z/OS (CICS TS z/OS) systems.
- Initial and cold starts describes the effect of initial and cold starts
on inter-connected systems, and how to decide when a cold start is possible.
- Managing connection definitions describes how safely to modify or discard MRO and
APPC parallel-session connections to other CICS TS z/OS systems.
- Connections that do not fully support shunting describes exceptions that apply to connections
other than MRO or APPC parallel-session links to other CICS TS z/OS systems.
- Problem determination describes the messages that CICS may issue during
a communication failure and recovery, and contains examples of how to resolve
in-doubt and resynchronization failures.

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