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From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Sergey Konoplev <gray.ru@gmail.com>
Cc: Dave Johansen <davejohansen@gmail.com>
Cc: Scott Marlowe <scott.marlowe@gmail.com>
Cc: Jeff Janes <jeff.janes@gmail.com>
Cc: pgsql-performance <pgsql-performance@postgresql.org>
Subject: Re: Recommendations for partitioning?
Date: Mon, 30 Dec 2013 18:29:07 -0300
Message-ID: <20131230212907.GT22570@eldon.alvh.no-ip.org> (raw)
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Sergey Konoplev escribió:
> On Fri, Dec 20, 2013 at 7:59 AM, Alvaro Herrera
> <alvherre@2ndquadrant.com> wrote:

> > Eh.  Why can't you just do something like
> >
> > WITH moved AS (
> >         DELETE FROM src WHERE ..
> >         RETURNING *
> > ) INSERT INTO dst SELECT * FROM moved;
> 
> Avero, I think it could be cheaper to do this like it is shown below, correct?
> 
> psql dbname -c 'copy src to stdout' | \
> psql dbname -c 'copy dst from stdin; truncate src;'

Yes, if you can get rid of the old records by removing or emptying a
partition (or de-inheriting it, as suggested elsewhere in the thread),
that's better than DELETE because that way you don't create dead rows to
vacuum later.

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services


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