Received: from localhost (postgresql.org [64.49.215.8])
	by postgresql.org (Postfix) with ESMTP id 2908E4758DC
	for <pgsql-sql@postgresql.org>; Thu, 21 Nov 2002 02:03:21 -0500 (EST)
Received: from news.hub.org (news.hub.org [64.49.215.80])
	by postgresql.org (Postfix) with ESMTP id B93A84753A1
	for <pgsql-sql@postgresql.org>; Thu, 21 Nov 2002 02:03:20 -0500 (EST)
Received: by news.hub.org (Postfix, from userid 8)
	id A6B6043A617; Thu, 21 Nov 2002 02:03:20 -0500 (EST)
From: ernest_it@hotmail.com (ernest_it@hotmail.com)
X-Newsgroups: comp.databases.postgresql.sql
Subject: can i decrease the query time?
Date: 20 Nov 2002 23:03:19 -0800
Organization: http://groups.google.com/
Lines: 18
Message-ID: <10d6eb7c.0211202303.53a7ac58@posting.google.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Complaints-To: groups-abuse@google.com
To: pgsql-sql@postgresql.org
X-Virus-Scanned: by AMaViS new-20020517
X-Archive-Number: 200211/372
X-Sequence-Number: 10514

i created index already. how can i decrease the query time more.

number of record is over 1 million.
the following is the query plan. 

Group (cost=34082.59..34085.62 rows=61 width=112)
-> Sort (cost=34082.59..34082.59 rows=607 width=112)
-> Nested Loop (cost=0.00..34054.51 rows=607 width=112)
-> Nested Loop (cost=0.00..125.64 rows=2 width=108)
-> Nested Loop (cost=0.00..8.84 rows=1 width=22)
-> Index Scan using tbl_member_pkey on tbl_member d (cost=0.00..5.14
rows=1 width=18)
-> Index Scan using tbl_company_pkey on tbl_company c (cost=0.00..3.68
rows=1 width=4)
-> Index Scan using tbl_adpage_pkey on tbl_adpage b (cost=0.00..112.65
rows=332 width=86)
-> Index Scan using tbl_showlog_adpage_id_idx on tbl_showlog a
(cost=0.00..20370.75 rows=5466 width=4)