Ahh, I think I see it now. So the idea would be to store all possible pairs (e.g. 2.5 billion) in a hash, then delete each pair after its been selected? That would be pretty memory intensive at the beginning, but peter-out by the end.

Given the testing density (100 million out of 2450 million = ~4%) perhaps the slowdown at the end won't be too considerable -- only one duplicate hit for every 24 new ones.

In reply to Re^4: Benchmarking A DB-Intensive Script by bernanke01
in thread Benchmarking A DB-Intensive Script by bernanke01

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