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v Managing the state, and controlling the execution, of each UOW
v Coordinating UOW-related changes during syncpoint processing for recoverable
resources
v Coordinating UOW-related changes during restart processing for recoverable
resources
v Coordinating recoverable conversations to remote nodes
v Temporarily suspending completion (shunting), and later resuming completion
(unshunting), of UOWs that cannot immediately complete commit or backout
processing because the required resources are unavailable, because of system,
communication, or media failure
Managing the state of each unit of work
The CICS recovery manager maintains, for each UOW in a CICS region, a record of
the changes of state that occur during its lifetime.
Typical events that cause state changes include:
v Creation of the UOW, with a unique identifier
v Premature termination of the UOW because of transaction failure
v Receipt of a syncpoint request
v Entry into the indoubt period during two-phase commit processing (see the
CICS Transaction Server for z/OS Glossary for a definition of two-phase commit)
TD
FC
FC/RLS
DB2
DBCTL
MQM
MRO
LU6.1
LU6.2
RDO
TS
LOG
Manager
Recovery
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Figure 3. CICS recovery manager and resources it works with
18 CICS TS for z/OS 4.1: Recovery and Restart Guide