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The biggest advantage, though, was merging two input files into a new file
where the new file (usually a transaction file) had to be in a specific
order. Or the primary file might be a summary file (say, a customer
summary) that is being updated based upon a transaction file. There is an
MR indicator that is turned on if there is a match between the two files so
one could use MR to update the summary or NMR to create a new summary record
(new customer, you know).
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