Re: sequence scan problem
От | John Beaver |
---|---|
Тема | Re: sequence scan problem |
Дата | |
Msg-id | 48697C66.5040501@gmail.com обсуждение исходный текст |
Ответ на | Re: sequence scan problem (Tom Lane <tgl@sss.pgh.pa.us>) |
Список | pgsql-performance |
<chuckle> You're right - for some reason I was looking at the (18 rows) at the bottom. Pilot error indeed - I'll haveto 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"><john.e.beaver@gmail.com></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"><prewrap=""> 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></blockquote>
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