From: Jim Nasby <Jim.Nasby@BlueTreble.com>
To: Tomas Vondra <tomas.vondra@2ndquadrant.com>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: checkpoints, proper config
Date: Fri, 11 Dec 2015 17:47:36 -0600
Message-ID: <566B6098.6020508@BlueTreble.com> (raw)
In-Reply-To: <566A24DD.8020106@2ndquadrant.com>
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On 12/10/15 7:20 PM, Tomas Vondra wrote:
>> I agree, but actually, what is the sense of checkpoint_warning? I think
>> it was useful back when we didn't have log_checkpoints, but now that we
>> have detailed checkpoint logging I think it's pretty much useless noise.
>>
>
> Not entirely. The WARNING only triggers when you get below the 30s (or
> whatever value is set in the config) and explicitly warns you about
> doing checkpoints too often. log_checkpoints=on logs all checkpoints and
> you have to do further analysis on the data (and it's just LOG).
Agree, though I also find it pretty useless to set it significantly less
than checkpoint_timeout in almost all cases. If you want ~5 minutes
between checkpoints checkpoint_timeout=30 seconds is way too low to be
useful. We should really change the default.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
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To: pgsql-performance@postgresql.org
Cc: Jim.Nasby@BlueTreble.com, tomas.vondra@2ndquadrant.com, alvherre@2ndquadrant.com
Subject: Re: checkpoints, proper config
In-Reply-To: <566B6098.6020508@BlueTreble.com>
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