| From: | "Jim C(dot) Nasby" <decibel(at)decibel(dot)org> |
|---|---|
| To: | Neil Conway <neilc(at)samurai(dot)com> |
| Cc: | Christopher Petrilli <petrilli(at)gmail(dot)com>, Ying Lu <ying_lu(at)cs(dot)concordia(dot)ca>, pgsql-general(at)postgresql(dot)org, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL |
| Date: | 2005-05-09 16:51:33 |
| Message-ID: | 20050509165133.GJ35026@decibel.org |
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| Thread: | |
| Lists: | pgsql-general pgsql-performance |
On Tue, May 10, 2005 at 02:38:41AM +1000, Neil Conway wrote:
> Jim C. Nasby wrote:
> >Having indexes that people shouldn't be using does add confusion for
> >users, and presents the opportunity for foot-shooting.
>
> Emitting a warning/notice on hash-index creation is something I've
> suggested in the past -- that would be fine with me.
Probably not a bad idea.
> >Even if there is some kind of advantage (would they possibly speed up
> >hash joins?)
>
> No, hash joins and hash indexes are unrelated.
I know they are now, but does that have to be the case? Like I said, I
don't know the history, so I don't know why we even have them to begin
with.
--
Jim C. Nasby, Database Consultant decibel(at)decibel(dot)org
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