Re: Pushing LIMIT into sub-queries of a UNION ALL?

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I apologize for the multiple posts. I sent this email right after joining the list and after it hadn't shown up a day later I figured that it had been lost or something and sent the other one.

Also, the database I posted this about does not have internet access and so I'm working on getting it moved over to a machine that does or getting it the info onto a machine where I can post the pertinent information about the schema and explain outputs.

Thanks,
Dave

--
Dave Johansen
phone: (520) 302-4526


On Sun, May 22, 2011 at 10:34 AM, Robert Klemme <shortcutter@xxxxxxxxxxxxxx> wrote:
Dave,

how often do you want to repeat that posting?  What about instead
replying to the answers you got so far?

Cheers

robert


On Tue, May 17, 2011 at 5:31 PM, Dave Johansen <davejohansen@xxxxxxxxx> wrote:
> I am using Postgres 8.3 and I have an issue very closely related to the one
> described here:
> http://archives.postgresql.org/pgsql-general/2005-06/msg00488.php
>
> Basically, I have a VIEW which is a UNION ALL of two tables but when I do a
> select on the view using a LIMIT, it scans the entire tables and takes
> significantly longer than writing out the query with the LIMITs in the
> sub-queries themselves. Is there a solution to get the view to perform like
> the sub-query version?
>
> Thanks,
> Dave



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http://blog.rubybestpractices.com/


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