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The original problem that was solved by having an unkeyed PF was that at that time keys could not be updated/changed. It had to be a delete and add operation, so it was just easier to leave the PF unkeyed. Thats is soooo mid-20th century!

David FOXWELL wrote:
Hi,

Does anyone out there systematically leave out keys from physical files, creating them only in logical files when needed?

If so, what are the advantages?

Thanks


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