be moving to it when it's
officially released.
-Original Message-
From: Tom Lane [mailto:[EMAIL PROTECTED]
Sent: September 23, 2005 2:13 PM
To: Gurpreet Aulakh
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] Query slower on 8.0.3 (Windows) vs 7.3 (cygwin)
Gurpreet Aulakh [EMAIL
Gurpreet Aulakh [EMAIL PROTECTED] writes:
While testing 8.1, I found that simple joins take longer in 8.1 than 8.0.
For example the sub query
SELECT doc.doc_documentid FROM document AS doc LEFT JOIN folder_document ON
doc.doc_documentid = folder_document.doc_documentId LEFT JOIN document as
After further investigation I have found that the reason why the query is
slower on 8.0.3 is that the hash and hash joins are slower on the 8.0.3.
So the question comes down to : Why are hash and hash joins slower? Is this
a postgres configuration setting that I am missing? Is the locale still
Gurpreet Aulakh [EMAIL PROTECTED] writes:
After further investigation I have found that the reason why the query is
slower on 8.0.3 is that the hash and hash joins are slower on the 8.0.3.
So the question comes down to : Why are hash and hash joins slower?
I looked into this a bit and
-performance@postgresql.org
Subject: Re: [PERFORM] Query slower on 8.0.3 (Windows) vs 7.3 (cygwin)
Gurpreet Aulakh [EMAIL PROTECTED] writes:
What is really interesting is the time it takes for the Hash to occur. For
the first hash, on the 7.3 it takes only 12ms while on the 8.0 it takes
47ms.
You
I have started to break my query down and analyze each piece.
What I have discovered is very interesting.
First here is a small piece of my query.
EXPLAIN ANALYZE SELECT doc.doc_documentid FROM document AS doc
LEFT JOIN document as root ON doc.doc_internalRootXref =
root.doc_documentId
Gurpreet Aulakh [EMAIL PROTECTED] writes:
What is really interesting is the time it takes for the Hash to occur. For
the first hash, on the 7.3 it takes only 12ms while on the 8.0 it takes
47ms.
You haven't told us a thing about the column datatypes involved (much
less what the query actually
