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Re: Hash index

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
Cc: Scott Marlowe <smarlowe(at)g2switchworks(dot)com>,RAJU kumar <raju_19db(at)rediffmail(dot)com>, pgsql-admin(at)postgresql(dot)org
Subject: Re: Hash index
Date: 2005-08-30 20:20:03
Message-ID: 24391.1125433203@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-admin
"Jim C. Nasby" <jnasby(at)pervasive(dot)com> writes:
> So does that mean a hash index could (theoretically) improve the
> performance of a hash join or hash aggregation?

I don't think so --- the whole point of a hash is to do your matching
in-memory, rather than jumping all over the disk for it ...

			regards, tom lane

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