The two CICS® catalog domains, namely the local catalog (CC) domain and the global catalog (GC) domain, are repositories used by other domains to hold information to allow an orderly restart. They enable CICS code to read, write, and purge records on the local and global catalog data sets so that a record of the CICS state can be maintained when CICS is not running.
These domains use a common set of programs to provide a domain interface to VSAM KSDS data sets for the local catalog (DFHLCD) and for the global catalog (DFHGCD). They also conceal, from the user domain, the underlying VSAM operations.
The local catalog is initialized with the DFHCCUTL utility to contain information that is relevant to a particular CICS system, including a list of domains.
The global catalog is used to hold information that is applicable to a whole CICS system. Thus, in an XRF system consisting of one active and one alternate CICS system, there are two local catalogs and one global catalog. Conversely, in a non-XRF system, there is one local catalog and one global catalog.
The descriptions that follow relate to the common set of programs for both the local and the global catalog domains.
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