in reply to Re: performance with mysql / file-caching / hash reference on demand
in thread performance with mysql / file-caching / hash reference on demand

This would be a very good point but all columns that are in any query are either primary or indxed.
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Re^3: performance with mysql / file-caching / hash reference on demand
by Your Mother (Archbishop) on May 02, 2021 at 14:26 UTC

    Too many indexes, or the wrong kinds of indexes, can cause performance problems too.