On Fri, 8 Sep 2006, Heikki Linnakangas wrote:
Date: Fri, 08 Sep 2006 15:22:19 +0100
From: Heikki Linnakangas <[EMAIL PROTECTED]>
To: Praveen Kumar N <[EMAIL PROTECTED]>
Cc: pgsql-hackers@postgresql.org
Subject: Re: [HACKERS] postgresql shared buffers
Praveen Kumar N wrote:
Following is the output of query i have executed.
Looks like Alvaro guessed right. It reads both relations in sequence, sorts
them in temporary storage, outside bufmgr, and then does a merge join on the
sorted inputs.
could you tell me how can we trace that? I mean which functions shall I
checkout for that.
If you want to see the behavior you expected, I think you need to define
indexes on a2 and b2, if you don't have them already, and coerce the planner
to choose a nested loop join. I'd suggest using "SET enable_seqscan=false;
SET enable_bitmapscan=false;" and see if that gets you a nested loop join.
--
N Praveen Kumar
Btech-IV CSE
IIIT,Hyd
AP,India
Imagination is more important than knowledge...
--Albert Einstein
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