Answer / guest

DISP=MOD is used when the dataset can be extended, ie, you
can add records at the end of an existing dataset.

Answer / sudha

Disp=mod means if the dataset already exists it will append
at the end of the existing dataset or if the dataset doesnt
already exist then it will create a new one and write into
it.

Answer / shridhar

1. For appending.
2. using same dataset in input and output and making some
changes in that. Use mod for input.
3. When not sure dataset is created or not.

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