From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Sergei Kornilov <sk@zsrv.org>
Cc: Nasby, Jim <nasbyj@amazon.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: pgsql: Improve autovacuum logging for aggressive and anti-wraparound ru
Date: Mon, 24 Sep 2018 18:11:17 -0300
Message-ID: <20180924211117.tpwxemzd3372nagj@alvherre.pgsql> (raw)
In-Reply-To: <23209391537822541@iva4-6d7004ac8463.qloud-c.yandex.net>
On 2018-Sep-24, Sergei Kornilov wrote:
> Hi
>
> > An autovacuum can't be just aggressive; it's either anti-wraparound or normal.
> But autovacuum _can_ be aggressive and not anti-wraparound.
> I build current master and can see 3 different line types:
> 2018-09-24 23:47:31.500 MSK 27939 @ from [vxid:4/272032 txid:0] [] LOG: automatic aggressive vacuum of table "postgres.public.foo": index scans: 0
> 2018-09-24 23:49:27.892 MSK 28333 @ from [vxid:4/284297 txid:0] [] LOG: automatic aggressive vacuum to prevent wraparound of table "postgres.public.foo": index scans: 0
> 2018-09-24 23:49:29.093 MSK 28337 @ from [vxid:4/284412 txid:0] [] LOG: automatic vacuum of table "postgres.public.foo": index scans: 0
Exactly.
It cannot be anti-wraparound and not aggressive, which is the line type
not shown.
"Aggressive" means it scans all pages; "anti-wraparound" means it does
not let itself be cancelled because of another process waiting for a
lock on the table.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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Subject: Re: pgsql: Improve autovacuum logging for aggressive and anti-wraparound ru
In-Reply-To: <20180924211117.tpwxemzd3372nagj@alvherre.pgsql>
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