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Tuning SQL with OPTIMIZER_MODE

edited Mar 25, 2012 10:07PM in Database Tuning (MOSC) 6 commentsAnswered
 Hi all,
   My Oracle version 9.2.0.4

   I read about OPTIMIZER_MODE parameter and I care about two values are: CHOOSE (default value) and ALL_ROWS.

   Difference between them is CHOOSE made oracle view statistics of objects in statement to use Cost-Based or Rule-Based. ALL_ROWS use Cost-Based and regardless of the presence of statistics.

   I saw some db server with 11g use ALL_ROWS but 9i is CHOOSE. I think that choosing ALL_ROWS is better for statements, am I right ?

   Thanks.

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