Subject: Re: Size of Temporary tablespace is increasing very much in
 postgresql 9.1.
To: Dinesh Chandra 12108 <Dinesh.Chandra@cyient.com>,
 "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
References: <8e77559fe4f74e469c9079b098c42aca@cyient.com>
From: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
Message-ID: <677ae7cf-d349-fe9d-a810-ba75f9885c44@catalyst.net.nz>
Date: Sat, 17 Dec 2016 14:57:57 +1300
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On 15/12/16 23:28, Dinesh Chandra 12108 wrote:

> Dear expert,
>
> In postgreSQL-9.1,the size of *pgsql_tmp* inside tablespace (Temp 
> tablespace) is increased by 544G in one day.
>
> However, the DBsize is as usual but tablespace size is getting increased.
>
> Could you please suggest why it is happening ?
>
>

That is due to queries doing sorts or (hash) joins. You can log which 
queries are doing this with the log_temp_files parameter.

Now it might be that this is just normal/expected (e.g complex data 
warehouse style workload), but it could also be many small queries that 
might benefit from some additional indexes (logging the queries will 
help you decide what if anything needs to be done).

regards

Mark


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