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One thing, though (and this is starting to look like time to transfer the thread to the RPG list):
We did determine that writing a duplicate key to a file (and allowing it to fail) was a real killer on speed. Is there a "cheap" way to check for a duplicate key without writing, and that works when you're trying to read the file sequentially even as you're adding to it?
I vaguely remember something about the relative costs of different record-level/native database operations. I don't remember whether it was on this list, or the RPG list, or in a magazine, or a Redbook, or elsewhere, but I do remember something about examples that did exactly the same thing in different ways, and ran at dramatically different speeds.
-- JHHL
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