Which two are true about Optimizer Statistics（）?
A、They are ignored by Optimizer if they are stale.
B、They provide real-time data about schema objects
C、By default, they are automatically gathered by a maintenance job
D、They are gathered by the SQL Tuning Advisor
E、They can be gathered by the DBMS_STATS package

答案:CE

版权声明：本文为博主原创文章，未经博主允许不得转载。

oracle