The CICS region

The total storage for a CICS® region is reported by the IEF374I message in the "VIRT=nnnK" portion for most address spaces. The equivalent message above the 16MB line is "EXT=nnnK". The sample statistics program, DFH0STAT, produces a report with this information. CICS formatted dumps and some specialized monitors may be useful to determine the sizes of the various components mentioned below. CICS statistics reports contain useful information about the subpools of the dynamic storage areas.

CICS virtual storage

CICS virtual storage requirements can be divided into:

Figure 134. CICS region layout
 The CICS region contains MVS storage (from the high address downwards), the CICS UDSA and the CICS CDSA (in the middle of the addresses), and other CICS storage (below the UDSA and the CDSA, and down to the low address).
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