Archive files are used to hold obsolete data, usually from the transaction files, but sometimes from the reference files as well.
Archive files may be introduced to contain transactions no longer current. Before introducing such files, investigate the user’s requirement carefully. It is attractive in principle to have two years’ sales history on line, but is there a valid business need?
Wherever possible, archive files should use the same format as current transaction files. Interrogation programs may then use either.
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