From: | "D(dot) Duccini" <duccini(at)backpack(dot)com> |
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To: | Pgsql-novice <pgsql-novice(at)postgresql(dot)org> |
Subject: | voodoo planner update |
Date: | 2002-05-08 01:27:46 |
Message-ID: | Pine.GSO.4.03.10205072020180.20094-100000@ra.bpsi.net |
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Lists: | pgsql-novice |
Here's where things get interesting:
now things have flipped around!
billdate = 1 is SLOWER than billdate = any other value
# explain select s.id from subaccounts s, accounts a where a.id = s.idaccount and a.billdate = 2;
NOTICE: QUERY PLAN:
Nested Loop (cost=0.00..16.42 rows=2 width=12)
-> Index Scan using idxaccountbilldate on accounts a (cost=0.00..2.02 rows=1 width=4)
-> Index Scan using idxsubprimary on subaccounts s (cost=0.00..14.22 rows=15 width=8)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# explain select s.id from subaccounts s, accounts a where a.id = s.idaccount and a.billdate = 1;
NOTICE: QUERY PLAN:
Hash Join (cost=79.83..310.33 rows=3506 width=12)
-> Seq Scan on subaccounts s (cost=0.00..71.10 rows=3510 width=8)
-> Hash (cost=76.03..76.03 rows=1520 width=4)
-> Seq Scan on accounts a (cost=0.00..76.03 rows=1520 width=4)
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david(at)backpack(dot)com BackPack Software, Inc. www.backpack.com
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+1 651.645.9798 fax Don't forget your BackPack!"
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