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Simple queries take a lot some times
Posted by: Paolo Ragone
Date: January 30, 2007 01:04PM

Hi,

I have a database with one big table (about 2 million rows and about 2.8 Gb for data). It also has a lot of indexes (all of them necessary). The .MYI is about 1.4 Gb.

The performance in general is very good, but is has happened a couple of times that (randomly) a simple update on this table would take about 200 seconds (when normally it wouldn't take even a sec).

I was wondering if perhaps this is happening because of the indexes (perhaps MySQL is needing to do some internal stuff once in a while and when this happens it's a bad moment for queries :).

Anyway,I was trying to see how MySQL handles the indexes or internal optimization because there wasn't any external factor that may have affected server performance.

So, any information on where I can find more info or if this has ever happened to you would be greatly appreciated.

This is happening on a MyISAM table with 13 indexes (one of them is a Full text index). MySQL version is 4.1.11 on Debian sarge3.

Thanks in advance :)

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