Re: Freeze avoidance of very large table.

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Petr Jelinek <petr(at)2ndquadrant(dot)com>, Greg S <stark(at)mit(dot)edu>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Freeze avoidance of very large table.
Date: 2016-03-07 19:03:08
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On Mon, Mar 7, 2016 at 12:41 PM, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
> Attached latest version optimisation patch.
> I'm still consider regarding pg_upgrade regression test code, so I
> will submit that patch later.

I was thinking more about this today and I think that we don't
actually need the PD_ALL_FROZEN page-level bit for anything. It's
enough that the bit is present in the visibility map. The only point
of PD_ALL_VISIBLE is that it tells us that we need to clear the
visibility map bit, but that bit is enough to tell us to clear both
visibility map bits. So I propose the attached cleanup patch.

Robert Haas
The Enterprise PostgreSQL Company

Attachment Content-Type Size
no-pd-all-frozen.patch application/x-patch 6.9 KB

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