| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> |
| Cc: | "alexandre paes :: aldeia digital" <alepaes(at)aldeiadigital(dot)com(dot)br>, pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: LIMIT Optimization |
| Date: | 2002-01-25 19:36:30 |
| Message-ID: | 200201251936.g0PJaUQ10608@candle.pha.pa.us |
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| Thread: | |
| Lists: | pgsql-sql |
> if I'm not mistaken, it's called partial sorting, when you stop
> sorting process after getting desired number of rows specified by LIMIT clause.
> it's extremely friendly for web applications, because 90% of users
> just read the first page of results. We already discussed this feature
> sometime during 7.1 dev and even made very crude patch. In our tests we
> got performance win of factor 5-6 ( getting first 100 row from 1mln ).
> We hope sometime we'll return to this.
But we already have cursor's assuming 10% return. Is allowing that
value to be changed using SET an acceptable solution?
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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