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Re: Disk full problem

From: Frank Bax <fbax(at)sympatico(dot)ca>
To: pgsql-novice(at)postgresql(dot)org
Subject: Re: Disk full problem
Date: 2005-04-22 13:26:36
Message-ID: 5.2.1.1.0.20050422084510.03665ba0@pop6.sympatico.ca (view raw or flat)
Thread:
Lists: pgsql-novice
You misread the documentation.  It says "normally not be more than 2 * 
checkpoint_segments + 1 files".  Notice the word "normally".  There can be 
more files on your system due to "short-term peak" in log activity, but 
system will recover space when system activity is reduced.  If your system 
has "short-term peaks" often enough, the system will not recover that space.

http://www.postgresql.org/docs/current/static/wal-configuration.html

I just checked two of my systems (both with default setting of 
checkpoint_segments = 3).  The production system has 4 log files (with 
timestamps 25-30 hours apart), the test system (which has been idle for a 
few days) has only 2 log files.




At 04:28 AM 4/22/05, Pradeepkumar, Pyatalo (IE10) wrote:


>But in the documentation, it says that there can be 2*checkpoint_segments +
>1 xlog files at a time. Since I have configured the only 1
>checkpoint_segments....there should be a maximum of only 3 xlog files taking
>only 48 MB, not 4 taking 65MB.
>
>
>
>-----Original Message-----
>From: pgsql-novice-owner(at)postgresql(dot)org
>[mailto:pgsql-novice-owner(at)postgresql(dot)org] On Behalf Of Frank Bax
>Sent: Thursday, April 21, 2005 6:26 PM
>To: pgsql-novice(at)postgresql(dot)org
>Subject: Re: [NOVICE] Disk full problem
>
>At 03:06 AM 4/20/05, Prashant wrote:
> >I am a new addition to this mailing list. I am using Postgresql 7.4.3.
> >I went through the postgresql documentation for saving the disk usage.
> >Accordingly i changed the checkpoint_segments parameter to 1 in the
> >postgresql.conf file. I cross checked by giving the SHOW ALL command.
> >It shows 1 for the checkpoint_segments parameter. But when I chk the
> >disk usage, the pg_xlog folder is taking up 65MB. There are 4 files
> >under pg_xlog folder. According to the documentation, it should be
> >taking only 16MB.
>
>Not quite.  the docs say 16M per file.  4 files * 16M = 64M
>
> >And one more thing I noticed was that the base folder under pgsql/data
> >folder is taking up 25MB space.
> >
> >How do I reduce the space taken up by these folders. I am running the
> >vaccumdb command at regular intervals.
>
>
>pgsql/data contains one folder for each database you created.  To further
>reduce space here, you'll need to drop tables and/or databases.


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