The global catalog
CICS uses the global catalog to save all resource definitions that were installed when CICS shut down.
- BMS maps sets and partition sets
- Connections and sessions
- Files
- LIBRARY concatenations
- Programs
- Terminals and typeterms
- Transactions and transaction profiles
- Transient data queues
The resource definitions that CICS saves at its shutdown might have been installed during a cold start from a list of groups specified by a group list system initialization parameter, or dynamically using RDO when the CICS region is running.
If you run CICS with START=AUTO and a warm or emergency restart results, CICS restores all the installed resource definitions as they were at normal CICS shutdown, or at the time of system failure. If a subsequent error occurs during the restore, appropriate messages are displayed. The general rule is that you cannot alter installed resource definitions during a restart except by coding START=COLD or START=INITIAL. For details of the results of the possible combinations of CICS restart-type and global catalog state, see Specifying the START system initialization parameter.
The CICS domains also use the global catalog to save their domain status between runs. In some cases this information can be overridden during a restart by supplying system initialization parameters. In other cases the domain information saved in the catalog is always used in a restart. Alternatively, you can enforce system defaults by performing a cold start.