.Which two are true about Oracle Optimizer Statistics, their use, and their collection? (Choose two.)
A.The number of table rows is considered when evaluating the cost of accessing a table using an index. B.Index balanced B*Tree height is considered when evaluating the cost of using an index. C.The Statistics Advisor can help recommend the best way to gather statistics. D.Statistics collected using DBMS_STATS always yield the best optimizer result. E.The Statistics Advisor generates actions for all recommendations.正确答案AC
