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Long query locking up MySQL Server
Posted by: Radek Antoniuk
Date: December 01, 2010 05:23AM

Hey,

I'd like to review my attitude to one problem.
I have a database with approx. 1M records in a MyISAM table, but that is not important I think.

The thing is. A Web Application is running a query on a database, that is using filesort,where,temporary.
This query takes appros 1200s to complete (at least).
After this SELECT is executed, it gets stored in CACHE, which is good.
However, when the server is restarted, and the query has to be cached first, then the web application piles up those queries ending up with number of those queries(exactly the same) running and the machine load going sky high.
Eventually, the server locks up.

How to avoid that situation? Any good practices?
My idea is that the web application has to check if that query is being executed but... maybe that can be achieved somehow on mysql level?

Thanks for help.

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