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How does query_rewrite_enabled=FALSE optimize database performance?

edited Jul 29, 2009 1:43AM in Database Tuning (MOSC) 8 commentsAnswered ✓
 Hi,

I obtained a copy of init.ora for the production database (9iR2)  from which data will migrate to my database.  The parameter query_rewrite_enabled is set to FALSE while my database (11gR1) has it set to TRUE by default.  I did some search on this parameter on the web to learn its purpose.  However, I do not see how it being set to FALSE will optimize database performance?  From one web site I also saw the same setting for a 9i database.  Is this a 9i thing?

Thanks,

Simon

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