Re: URGENT: Out of disk space pg_xlog

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От ohp@pyrenet.fr
Тема Re: URGENT: Out of disk space pg_xlog
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Msg-id Pine.UW2.4.53.0612221943070.10324@sun.pyrenet
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Ответ на Re: URGENT: Out of disk space pg_xlog  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: URGENT: Out of disk space pg_xlog  (Tom Lane <tgl@sss.pgh.pa.us>)
Re: URGENT: Out of disk space pg_xlog  (Alvaro Herrera <alvherre@commandprompt.com>)
Re: URGENT: Out of disk space pg_xlog  ("Steinar H. Gunderson" <sgunderson@bigfoot.com>)
Список pgsql-performance
On Fri, 22 Dec 2006, Tom Lane wrote:

> Date: Fri, 22 Dec 2006 13:14:18 -0500
> From: Tom Lane <tgl@sss.pgh.pa.us>
> To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
> Cc: Jeremy Haile <jhaile@fastmail.fm>, pgsql-performance@postgresql.org
> Subject: Re: [PERFORM] URGENT: Out of disk space pg_xlog
>
> "Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> > As I understand it, the log space accumulates for the oldest transaction
> > which is still running, and all transactions which started after it.
>
> No, pg_xlog can be truncated as soon as a checkpoint occurs.

Even for currently running transactions ?

My understanding was that checkpoint was syncing data files for commited
transactions.

What happens to pg_xlogs when a transaction updates M of rows/tables and
runs for hours?
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>
>             regards, tom lane
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