RE: <> causing full table scan

From: Richard Huntley <rhuntley_at_mindleaders.com>
Date: Tue, 30 Jul 2002 12:02:33 -0800
Message-ID: <F001.004A66C0.20020730120233@fatcity.com>

bp, indexes are used when limiting conditions are equalities not inequalities (<>, !=, NOT IN)
How about rewriting the query to replace the <> by an outer join.  

-----Original Message-----

Sent: Tuesday, July 30, 2002 3:20 PM
To: Multiple recipients of list ORACLE-L

Hi list ,
In one of my queries if I use <> in where clause it is causing full table scan . If i use "IN " ( ) it uses index . Actually if it is" <> " the it is doing hash join and if "IN" then nested loop . when i make opt_indx_cost_adj to 5 it starts using index again with <> condition .
Is there a way i can cause it to use index ( yeah i can use hints . ) ? anything else ..
-bp
       

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Author: Richard Huntley
  INET: rhuntley_at_mindleaders.com

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