Re: pg_upgrade: Pass -j down to vacuumdb

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>
Cc: Justin Pryzby <pryzby(at)telsasoft(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "Jamison, Kirk" <k(dot)jamison(at)jp(dot)fujitsu(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, "fabriziomello(at)gmail(dot)com" <fabriziomello(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Bruce Momjian <bruce(at)momjian(dot)us>
Subject: Re: pg_upgrade: Pass -j down to vacuumdb
Date: 2019-04-04 14:49:46
Message-ID: 5806.1554389386@sss.pgh.pa.us
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Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)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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