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Re: Hanging on copying to tmp table
Posted by: Brian Dalby
Date: April 24, 2012 02:44PM

Hi Rick,

Thank you for your reply.

The explain is the same when everything runs smoothly.
I am not able to recreate the issue and force the problem, it happens sporadically.

The issue is also there, if I do not use SQL_CACHE, I added SQL_CACHE to try to prevent the problem.

I tried to add the use index part, but it trippled the execution time of the query. Which is not intentional, as it is running on a webpage.

It does not happen every day, but lately it has occured quite a lot.

The server has 12 GB of memory, quad core cpu and so on.
The memory usage of MySQL is mostly around 20%.

Regards,
Brian

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