Re: Vacuum, visibility maps and SKIP_PAGES_THRESHOLD

From: Greg Stark <gsstark(at)gmail(dot)com>
To: Bruce Momjian <bruce(at)momjian(dot)us>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Vacuum, visibility maps and SKIP_PAGES_THRESHOLD
Date: 2011-06-07 10:59:06
Message-ID: BANLkTi=Vj6jA1ZZrNCmrwH3WYez4Bvy4tg@mail.gmail.com
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On Jun 3, 2011 8:38 PM, "Bruce Momjian" <bruce(at)momjian(dot)us> wrote:
>
> I realize we just read the pages from the kernel to maintain sequential
> I/O, but do we actually read the contents of the page if we know it
> doesn't need vacuuming? If so, do we need to?

I dont follow. What's your question?

Tom's final version does basically the optimal combination of the above I
think.

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