Re: Dramatic performance drop when table > 100MB
Thanks a lot - that was the problem indeed. I had a
PRIMARY KEY (time,msgid)
in my table definition but it turns out this does nothing for queries on msgid (only helps queries on time, or both time and msgid). "EXPLAIN SELECT" showed that quite clearly.
Creating an index for msgid solved the issue completely.
Still wondering why it did work (up to 100MB table size) but that's probably some kind of MySQL optimization for small tables.
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November 01, 2004 09:48PM
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November 02, 2004 06:46AM
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November 02, 2004 10:38AM
Re: Dramatic performance drop when table > 100MB
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November 02, 2004 04:14PM
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