From: Bruce Momjian <bruce@momjian.us>
To: yigongh@gmail.com
To: pgsql-docs@lists.postgresql.org
Subject: Re: The suggestion of reducing autovacuum_vacuum_cost_delay should be documented
Date: Tue, 12 May 2020 17:41:01 -0400
Message-ID: <20200512214101.GA21408@momjian.us> (raw)
In-Reply-To: <20200512214014.GD4666@momjian.us>
References: <158927918783.656.11973436145559215458@wrigleys.postgresql.org>
<20200512214014.GD4666@momjian.us>
On Tue, May 12, 2020 at 05:40:14PM -0400, Bruce Momjian wrote:
> On Tue, May 12, 2020 at 10:26:27AM +0000, PG Doc comments form wrote:
> > The following documentation comment has been logged on the website:
> >
> > Page: https://www.postgresql.org/docs/11/runtime-config-autovacuum.html
> > Description:
> >
> > The `autovacuum_vacuum_cost_delay` setting changes to 2ms in PostgreSQL 12
> > but in the old Postgresql version, the default setting is still 20ms. I
> > would suggest adding a suggestion in the old document
> > to lower the autovacuum_vacuum_cost_delay as:
> >
> > > The default value of autovacuum_vacuum_cost_delay is reduced to 2ms in
> > PostgreSQL 12. Reducing the autovacuum_vacuum_cost_delay will make the
> > autovacuum more aggressive and might reduce the vacuum cost for
> > write-intensive workload on big table.
>
> Uh, we usually don't suggest new defaults in back branches.
Basically, what I am saying is that if you want this, it would be a new
behavior that would need general discussion.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EnterpriseDB https://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
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To: pgsql-docs@postgresql.org
Cc: bruce@momjian.us, yigongh@gmail.com, pgsql-docs@lists.postgresql.org
Subject: Re: The suggestion of reducing autovacuum_vacuum_cost_delay should be documented
In-Reply-To: <20200512214101.GA21408@momjian.us>
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