Answer Posted / srinivas yadav

If the disp parameter is SHR and that same file is opened
in the extend mode then the file is treated as MOD.
MOD:It is used to append (add) the records.
Ex:Already 10 records are there in a file and i am adding 5
records to that of same file. so, by using disposition
parameter=MOD we can add the records to an already existing
file.

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