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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 15:00:25 -0300
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jim_yates wrote:
> Alvaro Herrera-9 wrote
> >
> > There must have been some confusion somewhere; certainly you shouldn't
> > be subtracting anything. The subtraction was just suggested as a way to
> > determine the age. The value to update pg_database.datminmxid to is the
> > oldest one of all the relminmxid in pg_class; so if you have 8376 as the
> > minimum value there, that's what you set pg_database.datminmxid to. Not
> > the 21973 value.
> >
> > update pg_database set datminmxid='8376' where datname='production-copy';
>
> Ok, I'm still confused. Is the value to use the Max value of relminmxid
> from pg_class or the value of NextMultiXactId from pg_controldump? Or are
> these the same thing?
You need to *minimum* of all the values in relminmxid (excluding those
that are zero).
The pg_controldata value is a mechanism to determine which value is
minimum -- when there's been wraparound, the minimum might be "smaller
than zero", i.e. something like 4 thousand millions. I doubt this is
your case though.
--
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: <20141009180022.GE7043@eldon.alvh.no-ip.org>
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