z/OS MVS JCL Reference
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z/OS MVS JCL Reference

A JOB statement PERFORM parameter applies to all steps of the job and overrides any EXEC statement PERFORM parameters.

Code EXEC statement PERFORM parameters when each job step is to execute in a different performance group. The system uses an EXEC PERFORM parameter only when no PERFORM parameter is on the JOB statement and only during the job step.

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