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What is the difference between READ BY ISN and FIND
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Answer Posted / kazim zaidi
Read by ISN i.e. Read Physical
File read in sequential order
you don't need to know the ISN
However, GET #ISN - you need to know ISN
Usually you read by Physical or by Descriptor, if the record meets certain criteria for update, record is read using GET followed by UPDATE (or DELETE).
FIND - Finds record based on the Descriptor value, if partial value given it creates a loop.
If you know the unique Descriptor value you can also code
FIND(1) filename ....
just to retrieve one record
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