From: Laurenz Albe <laurenz.albe@cybertec.at>
To: James Pang (chaolpan) <chaolpan@cisco.com>
To: pgsql-admin@lists.postgresql.org <pgsql-admin@lists.postgresql.org>
Subject: Re: autovacuum default run with vacuum_index_cleanup and vacuum_truncate and related lock?
Date: Mon, 07 Feb 2022 17:09:20 +0100
Message-ID: <9a196c5db21caadb873493439011e4959d387ffe.camel@cybertec.at> (raw)
In-Reply-To: <PH0PR11MB51917B6D0E1C97DA6EAAEC3FD62C9@PH0PR11MB5191.namprd11.prod.outlook.com>
References: <PH0PR11MB51917B6D0E1C97DA6EAAEC3FD62C9@PH0PR11MB5191.namprd11.prod.outlook.com>
On Mon, 2022-02-07 at 08:43 +0000, James Pang (chaolpan) wrote:
> It’s Postgres 13 version, we plan to migrate from Oracle to Postgres 13 on RHEL8.
> One maintain job is about autovacuum, with default config, autovacuum will do on
> tables with “vacuum_index_cleanup” and “vacuum_truncate” option?
> With both options, autovacuum woker will hold “access exclusive” lock when truncate
> empty blocks and cleanup index ? if that’s true, how to handle autovacuum to reduce
> the lock blocking issue?
Cleaning up the index will not take any locks that block data modifications.
The ACCESS EXCLUSIVE lock for truncation is only held for a very short time
and won't bother you (unless perhaps, you could get replication conflicts on
a standby server).
Yours,
Laurenz Albe
--
Cybertec | https://www.cybertec-postgresql.com
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To: pgsql-admin@postgresql.org
Cc: laurenz.albe@cybertec.at, chaolpan@cisco.com, pgsql-admin@lists.postgresql.org
Subject: Re: autovacuum default run with vacuum_index_cleanup and vacuum_truncate and related lock?
In-Reply-To: <9a196c5db21caadb873493439011e4959d387ffe.camel@cybertec.at>
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