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Statistics in Rule based database

From: Meng, Dennis <Dennis.Meng_at_alcoa.com>
Date: Fri, 25 Apr 2003 07:27:00 -0800
Message-ID: <F001.0058951F.20030425072700@fatcity.com>


Hi All,
Oracle 8.0.5
HP 11.0
Oracle Apps 11.0.3
What happens if we analyze the database on rule based optimizer? I have an Apps database with optimizer init parameter set to 'rule' and has some statistics in it ( previous DBA set this up). I have noticed that with statistics it seems to be using cost base optimizer because the query plan changes during different sampling period. I deleted the statistics from the database and the query plan became horrific with full table scans all over the place.
Can anybody explain to me what is going on here?

TIA Dennis

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Author: Meng, Dennis
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Received on Fri Apr 25 2003 - 10:27:00 CDT

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