От: Joel Fradkin
Тема: Re: speed of querry?
Дата: ,
Msg-id: 000001c540f9$311dd440$797ba8c0@jfradkin
(см: обсуждение, исходный текст)
Ответ на: Re: speed of querry?  (Tom Lane)
Ответы: Re: speed of querry?  (Dawid Kuroczko)
Список: pgsql-performance

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speed of querry?  ("Joel Fradkin", )
 Re: speed of querry?  (Richard Huxton, )
  Re: speed of querry?  ("Joel Fradkin", )
  Re: speed of querry?  (Tom Lane, )
   Re: speed of querry?  ("Joel Fradkin", )
    Re: speed of querry?  (Dawid Kuroczko, )
     Re: speed of querry?  ("Joel Fradkin", )
      Re: speed of querry?  (Dawid Kuroczko, )
       Re: speed of querry?  (Tom Lane, )
        Re: speed of querry?  ("Joel Fradkin", )
         Re: speed of querry?  ("Joel Fradkin", )
 Re: speed of querry?  ("Dave Held", )
  Re: speed of querry?  ("Joel Fradkin", )
   Re: speed of querry?  (Tom Lane, )
    Re: speed of querry?  ("Joel Fradkin", )
     Re: speed of querry?  (Tom Lane, )
 Re: speed of querry?  ("Dave Page", )
  Re: speed of querry?  ("Joel Fradkin", )

I have done a vacuum and a vacuum analyze.
I can try again for kicks, but it is not in production so no new records are
added and vacuum analyze is ran after any mods to the indexes.

I am still pursuing Dell on why the monster box is so much slower then the
desktop as well.

Joel Fradkin

Wazagua, Inc.
2520 Trailmate Dr
Sarasota, Florida 34243
Tel.  941-753-7111 ext 305


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-----Original Message-----
From: Tom Lane [mailto:]
Sent: Thursday, April 14, 2005 1:47 AM
To: Richard Huxton
Cc: Joel Fradkin; PostgreSQL Perform
Subject: Re: [PERFORM] speed of querry?

Richard Huxton <> writes:
> In the first, we match outer.clientnum to inner.clientnum, in the second
> it's "?column10?" - are you sure the query was identical in each case.
> I'm guessing the unidentified column in query 2 is the reason for the
> sort a couple of lines below it, which seems to take up a large chunk of
> time.

The "?column10?" is because EXPLAIN isn't excessively bright about
reporting references to outputs of lower plan nodes.  (Gotta fix that
sometime.)  The real point here is that the planner thought that a scan
plus sort would be faster than scanning an index that exactly matched
the sort order the Merge Join needed ... and it was wrong :-(

So this is just the usual sort of question of "are your stats up to
date, maybe you need to increase stats targets, or else play with
random_page_cost, etc" ...

            regards, tom lane



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