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From: John Beaver <john.e.beaver@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Jeremy Harris <jgh@wizmail.org>
Cc: Pgsql-Performance <pgsql-performance@postgresql.org>
Subject: Re: sequence scan problem
Date: Mon, 30 Jun 2008 20:37:58 -0400
Message-ID: <48697C66.5040501@gmail.com> (raw)
In-Reply-To: <28999.1214839555@sss.pgh.pa.us>
References: <48680418.7030708@gmail.com>
	<48680860.2000300@wizmail.org>
	<4868BC74.6020006@gmail.com>
	<28999.1214839555@sss.pgh.pa.us>

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&lt;chuckle&gt; You're right - for some reason I was looking at the (18
rows) at the bottom. Pilot error indeed - I'll have to figure out
what's going on with my data.<br>
<br>
Thanks!<br>
<br>
Tom Lane wrote:
<blockquote cite="mid:28999.1214839555@sss.pgh.pa.us" type="cite">
  <pre wrap="">John Beaver <a class="moz-txt-link-rfc2396E" href="mailto:john.e.beaver@gmail.com">&lt;john.e.beaver@gmail.com&gt;</a> writes:
  </pre>
  <blockquote type="cite">
    <pre wrap="">Ok, here's the explain analyze result. Again, this is Postgres 8.3.3 and 
I vacuumed-analyzed both tables directly after they were created.
    </pre>
  </blockquote>
  <pre wrap=""><!---->
  </pre>
  <blockquote type="cite">
    <pre wrap=""> Merge Join  (cost=1399203593.41..6702491234.74 rows=352770803726 
width=22) (actual time=6370194.467..22991303.434 rows=15610535128 loops=1)
    </pre>
  </blockquote>
  <pre wrap=""><!---->                                                        ^^^^^^^^^^^

Weren't you saying that only 50 rows should be returned?  I'm thinking
the real problem here is pilot error: you missed out a needed join
condition or something.  SQL will happily execute underconstrained
queries ...

			regards, tom lane

  </pre>
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