Re: 答复: [HACKERS] Re: [HACKERS] 答复: [HACKERS] postgres 1 个(共 2 个) can pg 9.6 vacuum freeze skip page on index?

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: xu jian <jamesxu(at)outlook(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: 答复: [HACKERS] Re: [HACKERS] 答复: [HACKERS] postgres 1 个(共 2 个) can pg 9.6 vacuum freeze skip page on index?
Date: 2016-12-02 13:32:44
Message-ID: CA+TgmoYxdhOvG_0chTLeXUjs3VDGkOmsAmeFH9XF5Gd6vJCmhg@mail.gmail.com
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On Thu, Dec 1, 2016 at 9:54 PM, xu jian <jamesxu(at)outlook(dot)com> wrote:
> Thanks every for your help. I am not familiar with the internal of the
> vacuum freeze, just curious if there is no row change on the table(in other
> words, all pages are frozen), why could index page have dead tuple?

It can't. If the *entire* table is frozen, then I would think it
shouldn't be scanning the indexes.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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