What's the differences of optimizer_features_enable between 8.1.7 and 9.2 i

Everyone , now i may to change the optimizer_features_enable to set is 8.1.7 due to have urgent performance issues after upgrade from 8i to 920 . I know the default value of optimzier_features_enable is 9.2 in 9i and it is a database level parameter. So i want to know all the differences of optimizer_features_enable between 9.2 and 8.1.7 . It will impact the whole system if changed it to 8.1.7 ? Thanks in advance !!

It will, obviously, affect the entire database. Setting optimizer_features_enable to 8.1.7 basically turns the CBO in your database back to an 8.1.7 CBO. There are a fairly large number of changes between 8.1.7 and 9.2, many in hidden parameters. I don't believe Oracle publishes a list of differences, but there are folks out there that have researched the differences. Wolfgand Breitling has a couple of papers on the subject http://www.centrexcc.com/
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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