(1) A storage area allocated from CICS-key storage below the 16MB line. The size of the CDSA is controlled by the CDSASZE system initialization parameter.
(2) In CICS/VSE, the CICS DSA is preallocated at system initialization, and is the area of storage left within the CICS partition after the CICS nucleus has been loaded. The size of the partition is determined by the EXEC DFHSIP SIZE parameter.