DSA constitute the memory area left over after all the program, buffer, tables, control blocks are allocated. DSA is divided into pages. Each pages are assigned to a different CICS subpools. Subspool determines how the storage is allocated to requests made.
Examples of subpools are for control, telecom, task, RPL and program etc. program subpool pages are allocated from the top of DSA. Programs generally uses more space per request. The other subpools uses relatively smaller chunk of space
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