CICS program subpool is separated from other subpool and is allocated from top down. Program compression means non-resident programs which are not in use is deleted during SOS. The PPT is scanned to identified such program which may be reloaded in the war future. So program compression is a resource intensive operation.
SCP maintained a minimum address for program subpool to keep the other data subpools from invading the program storage. Program storage allocated below the threshold are freed as soon as the program use count is zero.
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