Why do you want to specify the REGION paramter in a JCL step?

JOB CONTROLL LANGUAGE (JCL) Interview Questions

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Why do you want to specify the REGION paramter in a JCL step?

To override the REGION defined at the JOB card level. REGION specifies the MAX REGION size.
REGION = OK or 0M or omitting REGION means no limit will be applied.

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