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MEMORY tables appalling insert performance
Posted by: Slawek P
Date: October 26, 2009 11:46AM

mySQL 5.0.51a

Small MEMORY table, 100k rows, 80% insert, 20% select, 500q/sec.

inserts are ON DUPLICATE KEY UPDATE

All by UNIQUE PRI key, B-Tree index, index isn't changed during the update.

Now the problem is that INSERTS blocks for 1-2 sec every 10-30 sec. How do i know that INSERT is blocking? Because there are no SELECT / DELETE threads, only INSERT / UPDATE, with insert in LOCKED state.

I partitioned the table 10x 10k rows, nothing.
Turned off the query cache, nothing.

Any idea / software that'll be better suitable for this kind of traffic (for PHP)? InnoDB is not suitable (too many I/O writes).

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MEMORY tables appalling insert performance
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October 26, 2009 11:46AM


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