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From:Amr Mostafa Date:June 11 2009 7:02am
Subject:Re: Why is MySQL using /tmp?
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If I understand the manual correctly, it uses /tmp for creating temporary
tables if their size exceed the smaller of tmp_table_size or
max_heap_table_size, otherwise, it will create the temporary table in
memory. So if tmp_table_size is set to say 10Mb, and MySQL needs to create a
temporary table internally (which it does need for sorting and other stuff)
which would be about 20Mb, it's going to create it in /tmp. If that
temporary table had been 5Mb, it would have created it in memory.

I'm not sure how to calculate the needed space for /tmp. Check this for how
to change the tmp directory location:


On Thu, Jun 11, 2009 at 8:51 AM, Mike Spreitzer <mspreitz@stripped> wrote:

> I find my MySQL Community Edition 5.1.34 server running out of space on
> /tmp (which is indeed small).  Why is it using /tmp?  How much free space
> do I need on /tmp?  Can/should I make the server use a different location
> instead of /tmp?
> Thanks,
> Mike Spreitzer

Why is MySQL using /tmp?Mike Spreitzer11 Jun
  • Re: Why is MySQL using /tmp?Amr Mostafa11 Jun
    • Re: Why is MySQL using /tmp?Claudio Nanni11 Jun
Re: Why is MySQL using /tmp?Paul DuBois11 Jun