Having FKs allows for table elimination transformations: http://blogs.oracle.com/optimizer/entry/why_are_some_of_the_tables_in_my_query_missing_from_the_plan 2011/8/17 <Laimutis.Nedzinskas@xxxxxx>: > As for optimizer and foreign keys then it considers only uniqueness. > F-keys have no effect on CBO whatsoever. Correct me if I am wrong. -- Regards, Greg Rahn http://structureddata.org -- //www.freelists.org/webpage/oracle-l
