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Re: Pgstat.tmp file activity

From: "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu>
To: pgsql-admin(at)postgresql(dot)org
Subject: Re: Pgstat.tmp file activity
Date: 2005-12-23 01:24:17
Message-ID: dofjhs$2pqd$1@news.hub.org (view raw or flat)
Thread:
Lists: pgsql-admin
""Dan Austin"" <DAustin(at)au(dot)westfield(dot)com> wrote
>
> I take it that the file gets renamed almost immediately because we can
> also see writes to the parent directory -- but never see the file itself
> using ls.
>
I think so.

>
> /export/data/pgsql/data/base/64920741/pgsql_tmp/pgsql_tmp966.9
>
> What are these files used for? In this particular sample, that file was
> being written to a lot. Perhaps we're running out of memory for some
> sorting?
>

These files could be generated by several situations to store intermediate 
data. For example, hash join and external sort. For sort, if you increase 
sort_mem, then you may avoid/alleviate usage of temp file.

Regards,
Qingqing 



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