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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: Jeff Janes <jeff.janes@gmail.com>
Cc: Jesper Pedersen <jesper.pedersen@redhat.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Jamison, Kirk <k.jamison@jp.fujitsu.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: fabriziomello@gmail.com <fabriziomello@gmail.com>
Cc: pgsql-hackers@lists.postgresql.org <pgsql-hackers@lists.postgresql.org>
Cc: Bruce Momjian <bruce@momjian.us>
Subject: Re: pg_upgrade: Pass -j down to vacuumdb
Date: Thu, 04 Apr 2019 10:49:46 -0400
Message-ID: <5806.1554389386@sss.pgh.pa.us> (raw)
In-Reply-To: <18557ba2-3ee7-9e17-44f2-e208d26b8640@2ndquadrant.com>
References: <201902010958.cf2cbi3d2ule@alvherre.pgsql>
	<bef52417-2416-cb97-afce-a351601eab43@redhat.com>
	<D09B13F772D2274BB348A310EE3027C64659E9@g01jpexmbkw24>
	<CA+TgmobMGTfkMY-isz4pLw_bfywVOqTUDcW+obeAfYSeTBJM7A@mail.gmail.com>
	<03845f77-49e7-4569-7062-8ee1fb460ec2@redhat.com>
	<30470.1553551070@sss.pgh.pa.us>
	<2c054085-0b68-c049-d6d8-8b74852b4c73@2ndquadrant.com>
	<CAMkU=1zcOfThON4p00VTWEO1xdY6R8Xbh9KSt9pZkLHq0gdE=A@mail.gmail.com>
	<da27737d-9f3e-6798-c999-4adaa22c47f5@2ndquadrant.com>
	<CAMkU=1w2Yuvz+xbCU+42pT2U3GCE0xmkaSDXCgM9CR3bt=5Crw@mail.gmail.com>
	<20190403212434.GY17544@telsasoft.com>
	<18557ba2-3ee7-9e17-44f2-e208d26b8640@2ndquadrant.com>

Peter Eisentraut <peter.eisentraut@2ndquadrant.com> writes:
> I think the real fix is to have pg_upgrade copy over the statistics.
> They are right there after all, just take them.

Well, it's not "just take them", we need to develop some infrastructure
that will permit coping with cross-version differences in the stats
storage.  This isn't insoluble, but it will take some work.  We had
a prior discussion that trailed off without much result:

https://www.postgresql.org/message-id/flat/724322880.K8vzik8zPz%40abook

			regards, tom lane





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  Cc: tgl@sss.pgh.pa.us, peter.eisentraut@2ndquadrant.com, pryzby@telsasoft.com, jeff.janes@gmail.com, jesper.pedersen@redhat.com, robertmhaas@gmail.com, k.jamison@jp.fujitsu.com, alvherre@2ndquadrant.com, michael@paquier.xyz, fabriziomello@gmail.com, pgsql-hackers@lists.postgresql.org, bruce@momjian.us
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