| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Cc: | josh(at)agliodbs(dot)com, andres(at)anarazel(dot)de, alvherre(at)commandprompt(dot)com, ants(at)cybertec(dot)at, heikki(dot)linnakangas(at)enterprisedb(dot)com, cbbrowne(at)gmail(dot)com, neil(dot)conway(at)gmail(dot)com, daniel(at)heroku(dot)com, huangqiyx(at)hotmail(dot)com, Florian Pflug <fgp(at)phlo(dot)org>, pgsql-hackers(at)postgresql(dot)org, sfrost(at)snowman(dot)net, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | Re: Gsoc2012 idea, tablesample |
| Date: | 2012-05-11 17:05:37 |
| Message-ID: | CA+TgmoYHC+KCz_uJakW92quktb1w8i3E1OJGygrTusSj76DgvQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, May 11, 2012 at 11:36 AM, Kevin Grittner
<Kevin(dot)Grittner(at)wicourts(dot)gov> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> The trouble is, AFAICS, that you can't bound M very well without
>> scanning the whole table. I mean, it's bounded by theoretical
>> limit, but that's it.
>
> What would the theoretical limit be?
MaxHeapTuplesPerPage?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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