From: Kouber Saparev <kouber@gmail.com>
To: pgsql-admin@postgresql.org
Subject: VACUUM unable to accomplish because of a non-existent MultiXactId
Date: Fri, 27 Nov 2015 20:25:49 +0200
Message-ID: <62FE8F79-7278-4AE0-9FDE-0C0277A7B609@gmail.com> (raw)
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Hello,
Recently I spotted an auto vacuum that is constantly being run over a pg_toast table in the database. Interestingly the underlying table did not have that amount of writes that would trigger the auto vacuum every minute.
When I tried to run the VACUUM manually it died with a non-existent MultiXactId error:
db=# vacuum analyze verbose pg_toast.pg_toast_376621;
INFO: vacuuming "pg_toast.pg_toast_376621"
ERROR: MultiXactId 2915905228 does no longer exist -- apparent wraparound
db=# select txid_current();
txid_current
--------------
2583853583
(1 row)
db=# select datfrozenxid from pg_database where datname=‘db';
datfrozenxid
--------------
2161848861
(1 row)
We did a pg_upgrade about a month ago to upgrade from 9.2 to 9.4, so I guess there might be some relation, as I do not remember having that issue before the upgrade.
The question is, how can I clean the table in question and finally be able to run a vacuum over it?
Regards,
—
Kouber Saparev
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To: pgsql-admin@postgresql.org
Cc: kouber@gmail.com
Subject: Re: VACUUM unable to accomplish because of a non-existent MultiXactId
In-Reply-To: <62FE8F79-7278-4AE0-9FDE-0C0277A7B609@gmail.com>
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