Re: Why hash join instead of nested loop?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Ian Westmacott <ianw(at)intellivid(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Why hash join instead of nested loop?
Date: 2005-08-09 14:33:37
Message-ID: 15881.1123598017@sss.pgh.pa.us
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Ian Westmacott <ianw(at)intellivid(dot)com> writes:
> On Mon, 2005-08-08 at 20:58, Tom Lane wrote:
>> I'd be interested to see results from other people using 7.4.* too.

> 7.4.8:
> Total runtime: 0.198 ms

> 7.4.2:
> Total runtime: 0.697 ms

Just to be clear: those are two different machines of different speeds,
right? I don't believe we put any factor-of-three speedups into 7.4.*
after release ;-)

regards, tom lane

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