From: | Frederiko Costa <frederiko(at)gmail(dot)com> |
---|---|
To: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
Cc: | pgsql-admin(at)postgresql(dot)org |
Subject: | Re: archived WALL files question |
Date: | 2010-04-19 17:49:51 |
Message-ID: | 4BCC97BF.8090501@gmail.com |
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Thread: | |
Lists: | pgsql-admin |
On 04/19/2010 10:26 AM, Kevin Grittner wrote:
> Frederiko Costa<frederiko(at)gmail(dot)com> wrote:
>
>> I have seen new 16 MB segments files created in pg_xlog directory
>> as time goes on. Honestly, I did not understand why it got
>> created, because I was running it on a VM and there was no
>> activity. I got several new segments.
>>
>> If I run the command you asked, this is the output. Neither
>> segment is copied, nor a new segment file gets created:
>>
>> select pg_switch_xlog();
>> pg_switch_xlog
>> ----------------
>> 0/81000088
>> (1 row)
>>
>
> What version of PostgreSQL is this?
>
8.4.3
>
> What do you see if you run?:
>
> show archive_command;
>
cp -p %p /mnt/data/%f
> show archive_mode;
>
on
> show archive_timeout;
>
1min
I have just enabled that. Now, log files are being copied directly to
the /mnt/data dir. However, the same segments are not in the pg_xlog
dir. Is this a default behaviour?
Must I set archive_timeout? I don't think I want that, because,
specially for the next few months, where the activity would be very
limited and I would get several zero written segments just because
timeout has been reached. Is this approach recommended anyway? Or is it
better to use this approach even having limited approach?
> Check your log file from the time you ran pg_switch_xlog to look for
> any messages which might give a clue to what's happening.
>
>
The log files did not write anything about pg_switch_xlog.
> -Kevin
>
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