Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sI34E-00CTFK-MQ for pgsql-general@arkaria.postgresql.org; Fri, 14 Jun 2024 09:17:54 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1sI34B-00Ful1-0e for pgsql-general@arkaria.postgresql.org; Fri, 14 Jun 2024 09:17:51 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sI34A-00Fukt-Lt for pgsql-general@lists.postgresql.org; Fri, 14 Jun 2024 09:17:51 +0000 Received: from mail-oo1-xc33.google.com ([2607:f8b0:4864:20::c33]) by makus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94.2) (envelope-from ) id 1sI348-001G2l-TC for pgsql-general@postgresql.org; Fri, 14 Jun 2024 09:17:50 +0000 Received: by mail-oo1-xc33.google.com with SMTP id 006d021491bc7-5ba18126a3bso852903eaf.1 for ; Fri, 14 Jun 2024 02:17:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718356667; x=1718961467; darn=postgresql.org; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :from:to:cc:subject:date:message-id:reply-to; bh=n7ppN6nYfPG0cGheXoba7I6rzG8pQ6g3klQONQM+aLg=; b=I3FahETdsWfKOnDTVddEuyhsyjqsNrBGcxOHwQJPVsjqfkqCF6nPLcZQ3ArgLk02Uw in+4y/EiTuAJCJgX571sj0hgBnstBZEOIvzKJeUgfq2ZCz9eCoPC+T+vtVzI8+bG1FG4 9WP1lxoUsKFDtyN6gH5fRWXWhzb2w+a1NISJMmVJrcba8alSbznzvUJY/ojWwdfYifXu 052JqwoHCD1VBlyKReEP/1Y1lr/VMjdDOxskQUzhgmWRKEc6a8b3aXnmDfHbNTV6SBsX 00Iixv43PCnGmp1VL82D8QD+zsrUC6HyrvjaKVy+YwFgnzcF5+SAxHcfYrjvp3gZ3H8w E9Wg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718356667; x=1718961467; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=n7ppN6nYfPG0cGheXoba7I6rzG8pQ6g3klQONQM+aLg=; b=OXBBpHCPfSSVftM7icGbo1Ax6DPQJIP5uBglFF8Vtqb345R4P2gi4+RPbeLG2U0qmd 5zup965Tx1QpY+dKtoKYNNhr/IkV1Zu+QgK2l46QQCU8rTqOz5HLukDjzogmS+ohL7ii ZklB5FKb8+2c9SI1DAipYBpdm5Ipf+kEuylx56ISZ0EJjMyZVhRKObZwuQghKyFl/B8q H+z4GwWvoXO15VeSXZN2I4tt3+X0kB/tUf4luG3t08lMVUKPjuSUc1umDB9XzXy+Gu5o rgEpwAahsSp+/HMz0H0ZNTWtB7k8HGu9pVhyEbIXkQZhK9B+M6XrlK4ojNydyKVI6BCp 3vCA== X-Gm-Message-State: AOJu0YxQ5Uyt3YN80AOeUMvQSg3mRQ9hjzW4JZuPVgMO4+vYLeAyfyci wNQtn51t5Q7WFXphFERPs68OpXdQO2J8GWqrBQjgiMuqyGKuaNIUs5kjNYXct3cCAknvwtZZEAS RzernLwGhrMjyZ17/4D0f56aqEnUi2RQ8 X-Google-Smtp-Source: AGHT+IEDRY3+82hDtEtsMWL69+nISrJOdsKe2f5F0/5v1kdlTpEKv8mmPPKJILqbRbE+xvEbwCQ7MI4ftVTuLD6APLc= X-Received: by 2002:a05:6870:14cf:b0:254:b5b9:354c with SMTP id 586e51a60fabf-25840f95353mr1396250fac.8.1718356667350; Fri, 14 Jun 2024 02:17:47 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Ron Johnson Date: Fri, 14 Jun 2024 05:17:36 -0400 Message-ID: Subject: Re: Configure autovacuum To: pgsql-general Content-Type: multipart/alternative; boundary="000000000000c14659061ad61624" List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --000000000000c14659061ad61624 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Jun 14, 2024 at 2:20=E2=80=AFAM Shenavai, Manuel wrote: > Hi everyone, > > > > I would like to configure the autovacuum in a way that it runs very > frequently (i.e. after each update-statement). I tried the following > settings on my table: > > alter table mytable set (autovacuum_vacuum_scale_factor =3D 0.0); > > alter table mytable set (autovacuum_vacuum_cost_delay =3D 0.0); > > alter table mytable set (autovacuum_vacuum_cost_limit =3D 10000); > > alter table mytable set (autovacuum_vacuum_threshold =3D 1); > > > > I do a lot of updates on a single tuple and I would expect that the > autovacuum would start basically after each update (due to > autovacuum_vacuum_threshold=3D1). But the autovacuum is not running. > HOT is probably what you're looking for: https://www.postgresql.org/docs/14/storage-hot.html Presuming that the field you're updating is not indexed, and the table can be exclusively locked for as long as it takes to rewrite it: give the table "more space to work" in each page: ALTER TABLE foo SET (fillfactor =3D 30); VACUUM FULL foo; Then you don't need to VACUUM soooo frequently. --000000000000c14659061ad61624 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Fri, Jun 14, 2024 at 2:20=E2=80=AFAM S= henavai, Manuel <manuel.shena= vai@sap.com> wrote:

Hi everyone,

=C2=A0

I would like to configure the a= utovacuum in a way that it runs very frequently (i.e. after each update-sta= tement). I tried the following settings on my table:

alter table mytable set (autova= cuum_vacuum_scale_factor=C2=A0 =3D 0.0);

alter table mytable set (autova= cuum_vacuum_cost_delay=C2=A0 =3D 0.0);

alter table mytable set (autova= cuum_vacuum_cost_limit=C2=A0 =3D 10000);

alter table mytable set (autova= cuum_vacuum_threshold=C2=A0 =3D 1);

=C2=A0

I do a lot of updates on a sing= le tuple and I would expect that the autovacuum would start basically after= each update (due to autovacuum_vacuum_threshold=3D1). But the autovacuum i= s not running.


HOT is probably what you= 're=C2=A0looking for: https://www.postgresql.org/docs/14/storage-hot.html

Presuming that the field you're updating is not in= dexed, and the table can be exclusively locked for as long as it takes to r= ewrite it: give the table "more space to work" in each page:
ALTER TABLE foo SET (fillfactor=C2=A0=3D 30)= ;
VACUUM FULL foo;

Then you don't need to VACUUM soooo frequently.
=

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