Have you given thought that maybe you should just do the work on the db server via stored procedure or some such, and only return back the data needed to render user output (regardless of format)? Since you've claimed both of these keys to be unique, you presumably already have enforced that in the db and that should mean they're indexed anyway, and then you don't really need to worry about how many lookup keys you have.

And, out of left field, comes Tanktalus...

In reply to Re^4: Too Many IDs by Tanktalus
in thread Too Many IDs by The_Dj

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