[paulddraper]

> 128 bits vs. 64 bits doesn't matter much when the table has five other columns.

!!!!

But those 5 other columns are not indexed.

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There are three levels of database performance:

1. Indices and data fit in memory.

2. Indices fits in memory, data does not.

3. Neither indices not data fit in memory.

If you can do #1 great, but if you don't have that, fight like a madman for #2.

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Doubling your index sizes is just makes it harder.