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From: Bruce Momjian <bruce@momjian.us>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: "Hugo <Nabble>
Cc: " <hugo.tech@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: pg_dump and thousands of schemas
Date: Fri, 25 May 2012 11:18:30 -0400
Message-ID: <20120525151830.GD25444@momjian.us> (raw)
In-Reply-To: <20887.1337956883@sss.pgh.pa.us>
References: <1337843209018-5709766.post@n5.nabble.com>
	<CAFwQ8rdZ3LjiwdDuzNR3vN=OryQ6fzDb08hzeKzNbOzrQXNPbA@mail.gmail.com>
	<CAMkU=1zgUUqT6ZPAFAMR6cFx01Bbk+y05Fmwk63PBHOMrBPPoQ@mail.gmail.com>
	<20120525035455.GC25444@momjian.us>
	<1337921645663-5709975.post@n5.nabble.com>
	<20887.1337956883@sss.pgh.pa.us>

On Fri, May 25, 2012 at 10:41:23AM -0400, Tom Lane wrote:
> "Hugo <Nabble>" <hugo.tech@gmail.com> writes:
> > If anyone has more suggestions, I would like to hear them. Thank you!
> 
> Provide a test case?
> 
> We recently fixed a couple of O(N^2) loops in pg_dump, but those covered
> extremely specific cases that might or might not have anything to do
> with what you're seeing.  The complainant was extremely helpful about
> tracking down the problems:
> http://archives.postgresql.org/pgsql-general/2012-03/msg00957.php
> http://archives.postgresql.org/pgsql-committers/2012-03/msg00225.php
> http://archives.postgresql.org/pgsql-committers/2012-03/msg00230.php

Yes, please help us improve this!  At this point pg_upgrade is limited
by the time to dump/restore the database schema, but I can't get users
to give me any way to debug the speed problems.

Someone reported pg_upgrade took 45 minutes because of pg_dumpall
--schema, which is quite long.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +



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