Today there is the first very interesting Day of the DOAG Berliner Expert Seminar "DB Tuning, Optimizing Oracle" with ORACLE ACE Director Jonathan Lewis.
This topis will be discussed:
CBO session 1: Why isn’t Oracle using my index?
CBO session 2: Mechanisms of Joins
CBO session 3: Selectivity, Joins, and hints
Explain Plan session 1 and 2: Finding and Reading Plans