Multiple choice technology mainframe

when DISP=MOD is used in JCL?

  1. when the dataset can be extended

  2. when the dataset can be newly created

  3. just to share the dataset & not for editing

  4. when dataset needs to be edited & deleted
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A Correct answer
Explanation

DISP=MOD in JCL is used when you want to extend an existing sequential dataset by adding new records at the end. It positions the dataset at end-of-file for writing, unlike DISP=NEW which creates a fresh dataset or DISP=SHR which is read-only sharing. MOD does not allow editing or deleting existing records.

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