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help / color / mirror / Atom feedFrom: Alvaro Herrera <alvherre@2ndquadrant.com>
To: jim_yates <pg@wg5jim.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: could not access status of transaction pg_multixact issue
Date: Thu, 9 Oct 2014 17:36:37 -0300
Message-ID: <20141009203637.GH7043@eldon.alvh.no-ip.org> (raw)
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jim_yates wrote:
> Then I'm really confused.
> The minimum relminmxid for all the rows in pg_class that have relminmxid
> greater then zero is 1.
> That's the current value of datminmxid in pg_database.
>
> And the NextMultiXactId from pg_controldump is 303464.
>
> So if I use the min value from pg_class then I have some other issue.
>
> Where should I get the new pg_database value from?
I'm deep in another issue which I don't want to page out right now, but
try vacuuming the tables that have relminmxid=1 with low values set for
vacuum_multixact_freeze_table_age and vacuum_multixact_freeze_min_age,
say 100000. (I think 65536 ought to get you beyond segment
pg_multixact/offset/0000, and then that file would be removed.) Since
any multixact values below the point at which pg_upgrade ran should be
marked "no longer running" through hint bits, there would be no
pg_multixact lookups anyway and thus the vacuuming should complete with
no errors.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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To: pgsql-sql@postgresql.org
Cc: alvherre@2ndquadrant.com, pg@wg5jim.net
Subject: Re: could not access status of transaction pg_multixact issue
In-Reply-To: <20141009203637.GH7043@eldon.alvh.no-ip.org>
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