Which three are true about the Oracle Optimizer? (Choose three.)
A.正确答案BCDIt obeys all hints.
B.It considers the filters in WHERE clauses when generating execution plans for SQL statements.
C.It can re-optimize execution plans after previous executions detect suboptimal plans.
D.It considers object statistics when generating execution plans for SQL statements.
E.It updates stale object statistics in the Data Dictionary.
F.It can only use SQL plan Directives tied to the SQL statement for which a plan is being generated.
