You can control whether your CICS® region uses storage protection by specifying the STGPROT system initialization parameter. By default, CICS does not use storage protection, and all applications run in the same key as CICS.
When you specify STGPROT=YES and
the required hardware and software support for storage protection
is available, the storage for the CICS dynamic
storage areas for user applications is allocated from user-key storage.
These DSAs are the UDSA, SDSA, EUDSA, ESDSA, GUDSA, and GSDSA. If
you specify STGPROT=NO, the storage for these
DSAs is allocated from CICS-key storage.
If you specify STGPROT=YES but the hardware and software support for storage protection is not available, CICS issues an information message during initialization and operates without storage protection.
The default option with no storage protection is suitable for pure terminal-owning regions (TORs) that do not execute user transactions. If you want storage protection in a CICS region, you must specify this requirement on the STGPROT system initialization parameter.
