Question: Why do you want to specify the REGION parameter in a JCL step?
Answer: To override the REGION defined at the JOB card level.REGION specifies the max region size. REGION=0K or 0M or omitting REGION means no limit will be applied.
To override the REGION defined at the JOB card level.REGION specifies the max region size. REGION=0K or 0M or omitting REGION means no limit will be applied. Source: CoolInterview.com
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