Choose the best answer.
Which statement correctly describes the SQL profiling performed by the SQL Tuning Advisor?
A.It is a set of recommendations by the optimizer to change the access methods used. B.It is auxiliary information collected by the optimizer for a SQL statement to eliminate estimation error. C.It is a set of recommendations by the optimizer to restructure a SQL statement to avoid suboptimal execution plans. D.It is auxiliary information collected by the optimizer for a SQL statement to help use better joins orders. E.It is a set of recommendations by the optimizer to create new indexes.正确答案B
