| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Simon Riggs <simon(at)2ndQuadrant(dot)com>,Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Petr Jelinek <petr(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
| Subject: | Re: Freeze avoidance of very large table. |
| Date: | 2015-10-08 17:52:40 |
| Message-ID: | 4C0361FB-447C-4624-B966-530AA0325A5B@anarazel.de |
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| Lists: | pgsql-hackers |
On October 8, 2015 7:35:24 PM GMT+02:00, Simon Riggs <simon(at)2ndQuadrant(dot)com> wrote:
>The problem is we won't be able to tell the two formats apart, since
>they
>both are just lots of bits. So we won't be able to tell if the file is
>old
>format or new format, which could lead to loss of information that
>relates
>to visibility.
I don't see the problem? I mean catversion will reliably tell you which format the vm is in?
We could additionally use the opportunity to as a metapage, but that seems like an independent thing.
Andres
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Please excuse brevity and formatting - I am writing this on my mobile phone.
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