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"Error Code : 1037 - Out of memory; restart server and try again" when using order by clause

Posted on 2006-11-19
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Last Modified: 2007-12-19
I've just re-installed mysql and now certain queries cause my app to fail.

Specifically, the query "select distinct * from mytable order by name" causes the following error:

Error Code : 1037 Out of memory; restart server and try again (needed 65528 bytes)

If I remove the "order by" clause then it runs just fine so I'm guessing that the memory issue is a red herring? If not, then how do you determine what an acceptable memory value should be?
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Question by:groovyjon
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Raynard7 earned 500 total points
ID: 17975925
Hi,

each thread / connection has a memory limit assigned to it - this is the maximum amount of room for all temp tables and memory tables at any point in time.

If you have this too small then if you need to do a sort - it creates a temporary table and then sorts by it - then there is not enough room to create it in memory.

The size of memory depends on what system you are running, what queries that you are using and the number of simultaneous users.

If you have say 512 MB free normally and you only have 20 users or so then 6MB would do your job, if you had less and many many more users then this would start paging memory on your machine.

I would probably say that 1 MB should be sufficient for most normal purposes.

Additionally it is important to note the memory is not allocated until it is being used by the user - so even if you have three connections at 1MB memory they probably will not take 3MB but probably 1 until the others take more when runnign queries.
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