Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL 8.0)

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От
Christopher Petrilli
Тема
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL 8.0)
Дата
в 12:28:02
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59d991c405050908271b55e673@mail.gmail.com
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Дерево обсуждения
"Hash index" vs. "b-tree index" (PostgreSQL 8.0) Ying Lu <ying_lu@cs.concordia.ca>
Re: "Hash index" vs. "b-tree index" (PostgreSQL 8.0) Neil Conway <neilc@samurai.com>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL 8.0) Christopher Petrilli <petrilli@gmail.com>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Neil Conway <neilc@samurai.com>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL "Jim C. Nasby" <decibel@decibel.org>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Neil Conway <neilc@samurai.com>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL "Jim C. Nasby" <decibel@decibel.org>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Bruce Momjian <pgman@candle.pha.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Neil Conway <neilc@samurai.com>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL "Jim C. Nasby" <decibel@decibel.org>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Mischa Sandberg <mischa.sandberg@telus.net>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Mark Lewis <mark.lewis@mir3.com>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Mischa Sandberg <mischa.sandberg@telus.net>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Bruce Momjian <pgman@candle.pha.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Mischa Sandberg <mischa.sandberg@telus.net>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Bruce Momjian <pgman@candle.pha.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Mischa Sandberg <mischa.sandberg@telus.net>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Neil Conway <neilc@samurai.com>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Bruce Momjian <pgman@candle.pha.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Tom Lane <tgl@sss.pgh.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Mischa Sandberg <mischa.sandberg@telus.net>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Tom Lane <tgl@sss.pgh.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Tom Lane <tgl@sss.pgh.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL "Jim C. Nasby" <decibel@decibel.org>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Tom Lane <tgl@sss.pgh.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL "Jim C. Nasby" <decibel@decibel.org>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Neil Conway <neilc@samurai.com>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Tom Lane <tgl@sss.pgh.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Neil Conway <neilc@samurai.com>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Greg Stark <gsstark@mit.edu>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Tom Lane <tgl@sss.pgh.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Greg Stark <gsstark@mit.edu>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Tom Lane <tgl@sss.pgh.pa.us>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Greg Stark <gsstark@mit.edu>
Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL Tom Lane <tgl@sss.pgh.pa.us>
On 5/9/05, Neil Conway  wrote:
> I don't think we've found a case in which the hash index code
> outperforms B+-tree indexes, even for "=". The hash index code also has
> a number of additional issues: for example, it isn't WAL safe, it has
> relatively poor concurrency, and creating a hash index is significantly
> slower than creating a b+-tree index.

This being the case, is there ever ANY reason for someone to use it? 
If not, then shouldn't we consider deprecating it and eventually
removing it.  This would reduce complexity, I think.

Chris
-- 
| Christopher Petrilli
| petrilli@gmail.com
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