From: Claudio Nanni
Date: June 11 2009 9:16am
Subject: Re: Why is MySQL using /tmp?
List-Archive: http://lists.mysql.com/mysql/217839
Message-Id: <53bcf3a60906110216o6accbd0di8ae2939f4616e084@mail.gmail.com>
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary=000e0cd29d36c7c1a2046c0f0de2

--000e0cd29d36c7c1a2046c0f0de2
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

Yes it is used for temporary tables.
You can also set the directory for temporary tables to some bigger
partition.

Cheers

Claudio


2009/6/11 Amr Mostafa <amr.mostafa@stripped>

> 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:
>
>
> http://dev.mysql.com/doc/refman/5.1/en/server-system-variables.html#sysvar_tmpdir
>
> Cheers,
> Amr
>
> 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
> >
>

--000e0cd29d36c7c1a2046c0f0de2--