OCP-052考試題庫彙總（10）-CUUG內部解答版

Which two are true about Oracle's Optimizer statistics?

A)They are automatically updated when ddl statements execute.

B)They can be calculated exactly.

C)They can be gathered on external tables.

D)They are automatically updated when dml statements execute.

E)They can be estimated.

Answer: BE

趙：

estimated adj. 估計的;預計的;估算的;