| From: | "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> |
|---|---|
| To: | "Robert Haas" <robertmhaas(at)gmail(dot)com> |
| 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 17:16:12 |
| Message-ID: | 4FAD030C0200002500047BF1@gw.wicourts.gov |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> 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?
What about dead line pointers without corresponding tuples?
-Kevin
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