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Tony Carolla wrote: > > >From what I understand, if you define a DS using LIKEREC or an > external DS based on a file format, then you do input (READ, > CHAIN,etc.) from the file using the DS, there is a speed advantage, > because the read plunks down the entire record over your DS, and each > field of data doesn't have to be moved to the 'file' fields. > > Does this speed advantage work if you follow the methodology you > mention, in using a prefix with a dot specified at the end ('PT.'). No, it still moves the buffer to the subfields one by one.
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