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08.20.2003 at 12:41PM PDT, ID: 20715327
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6.6

Difference between following two queries?

Asked by StriderX in Oracle Product Info

Tags: , , , ,

I have following two queries that do exact same thing. Only difference is the order of the tables in FROM clauses.
Can someone explain why the speed of the query is different between the two?
First query:

select count(*)
from
spaces cs,
rates crg,
seasons css
where
cs.customer_id = css.customer_id
and cs.class_id = crg.class_id
and cs.attribute_id = crg.attribute_id
and cs.type_id = crg.type_id

Second Query:

select count(*)
from
spaces cs,
seasons css,
rates crg
where
cs.customer_id = css.customer_id
and cs.space_class_id = crg.class_id
and cs.attribute_id = crg.attribute_id
and cs.type_id = crg.type_id

First query takes at least 20 seconds to fetch rows while second query is instant.
All join columns are either primary keys or have indexes.
This is not the actual query I'm runnign on my app.
I was trying to isolate the slowness and came up with above queries.
How come first one takes longer than second one?

There are about 1000 rows in spaces. 300 rows in rates and 100 rows in seasons.

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[+][-]08.20.2003 at 02:53PM PDT, ID: 9191605

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[+][-]08.20.2003 at 10:10PM PDT, ID: 9193204

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[+][-]08.21.2003 at 03:48AM PDT, ID: 9194518

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[+][-]08.21.2003 at 09:16AM PDT, ID: 9196652

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[+][-]08.22.2003 at 09:22AM PDT, ID: 9204651

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[+][-]08.25.2003 at 07:31AM PDT, ID: 9216396

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[+][-]08.26.2003 at 04:45PM PDT, ID: 9228597

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About this solution

Zone: Oracle Product Info
Tags: difference, between, index, queries, two
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Solution Provided By: bmoshier
Participating Experts: 4
Solution Grade: A
 
 
[+][-]08.27.2003 at 09:15AM PDT, ID: 9233677

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[+][-]08.27.2003 at 09:18PM PDT, ID: 9237649

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