Re: Why so many xlogs?

From: Cédric Villemain <cedric(dot)villemain(dot)debian(at)gmail(dot)com>
To: depesz(at)depesz(dot)com
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Why so many xlogs?
Date: 2010-11-01 19:13:49
Message-ID: AANLkTi=VbN-TaL+O0EdpxhoMcV_CR9wz-b4T90BntJ8j@mail.gmail.com
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2010/11/1 hubert depesz lubaczewski <depesz(at)depesz(dot)com>:
> On Mon, Nov 01, 2010 at 07:22:50PM +0100, Cédric Villemain wrote:
>> > as I understand, max number of xlog files in pg_xlog should be ( 1 + 2 *
>> > checkpoint_segments ).
>> (2 + checkpoint_completion_target) * checkpoint_segments + 1
>> => 291
>
> this is formula gave to me by rhodiumtoad on irc, but we tested with lower
> checkpoint_completion_target and it didn't change *anything*.

You'll have between 211 and 291 files for 0.1 to 0.9
checkpoint_completion_target.
You'd have more than the number of files given by formula used during
your tests ?

>
> Best regards,
>
> depesz
>
> --
> Linkedin: http://www.linkedin.com/in/depesz  /  blog: http://www.depesz.com/
> jid/gtalk: depesz(at)depesz(dot)com / aim:depeszhdl / skype:depesz_hdl / gg:6749007
>

--
Cédric Villemain               2ndQuadrant
http://2ndQuadrant.fr/     PostgreSQL : Expertise, Formation et Support

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