From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
Cc: | Guillaume Lelarge <guillaume(at)lelarge(dot)info>, PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Maximum number of WAL files in the pg_xlog directory |
Date: | 2014-11-26 23:00:50 |
Message-ID: | 20141126230050.GB15839@momjian.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On Mon, Nov 3, 2014 at 12:39:26PM -0800, Jeff Janes wrote:
> It looked to me that the formula, when descending from a previously stressed
> state, would be:
>
> greatest(1 + checkpoint_completion_target) * checkpoint_segments,
> wal_keep_segments) + 1 +
> 2 * checkpoint_segments + 1
I don't think we can assume checkpoint_completion_target is at all
reliable enough to base a maximum calculation on, assuming anything
above the maximum is cause of concern and something to inform the admins
about.
Assuming checkpoint_completion_target is 1 for maximum purposes, how
about:
max(2 * checkpoint_segments, wal_keep_segments) + 2 * checkpoint_segments + 2
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ Everyone has their own god. +
From | Date | Subject | |
---|---|---|---|
Next Message | Maxim Boguk | 2014-11-26 23:01:32 | Re: BUG #12071: Stat collector went crasy (50MB/s constant writes) |
Previous Message | Tom Lane | 2014-11-26 22:48:43 | Re: bug in json_to_record with arrays |