z/OS MVS JCL Reference
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Relationship to the JOB REGION parameter

z/OS MVS JCL Reference
SA23-1385-00

When ADDRSPC=REAL: Code a REGION parameter to specify how much central storage (also called real storage) the job needs. If you omit the REGION parameter, the system uses an installation default specified at JES initialization.

When ADDRSPC=VIRT or ADDRSPC is Omitted: Code a REGION parameter to specify how much virtual storage the job needs. If you omit the REGION parameter, the system uses an installation default specified at JES initialization.

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