Saturday, January 13, 2024

CICS Table Management

Table management module was introduced to supported RDO on CICS.  As RDO is dynamic in nature, TMP uses a chained table entries in a list so that the size can changed without restarting CICS. Each control table chain in CICS started from  a scatter table which contain a hash table of pointers. Table entries are hashed for fast search starting from the pointer in corresponding table entries. Entries hashed to the same value will be chained off. The scatter table also contains a pointer that chain all entries for sequential scan through the whole table.  Program like CEMT can access tables via a call to TMP.

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