Re: URGENT: Out of disk space pg_xlog

On Fri, 22 Dec 2006, Tom Lane wrote:

> Date: Fri, 22 Dec 2006 13:14:18 -0500
> From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
> To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
> Cc: Jeremy Haile <jhaile(at)fastmail(dot)fm>, pgsql-performance(at)postgresql(dot)org
> Subject: Re: [PERFORM] URGENT: Out of disk space pg_xlog
>
> "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)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?
[snip]
>
> regards, tom lane
>
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regards
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