| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Florian Pflug <fgp(at)phlo(dot)org> |
| Cc: | Cédric Villemain <cedric(dot)villemain(dot)debian(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | Re: the big picture for index-only scans |
| Date: | 2011-06-19 21:16:13 |
| Message-ID: | BANLkTimmLg9FkeN3CuYTsmLw=tvkVLWE=A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Jun 19, 2011 at 5:10 PM, Florian Pflug <fgp(at)phlo(dot)org> wrote:
> On Jun19, 2011, at 20:40 , Robert Haas wrote:
>> 2. Since VACUUM and ANALYZE often run together, we will be estimating
>> the percentage of rows on all-visible pages just at the time when that
>> percentage is highest. This is not exactly wonderful, either...
>
> Hm, doesn't autovacuum run ANALYZE quite a bit more frequently than
> VACUUM by default?
The autoanalyze threshold is, by default, 10%; and the autovacuum
threshold, 20%.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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