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OCP 1Z0-052完整版题库收集整理中-2

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2018年Oracle对OCP考试的题库进行了更新，考试形式更加灵活，考题顺序发生变化，更是有不断的新题出现，对很多考生造成影响，为了帮助大家顺利通过OCP考试，这里对OCP的新题进行了收集整理。

2、Which two are true about Optimizer Statistics?

A) They do not persist across Instance restarts.

B) They are automatically updated when DDL statements execute.

C) They are gathered by the Manageability Monitor (MMON) background process.

D) They can be gathered by executing the PL/SQL procedures in the DBMS_STATS package.

E) They can be used to determine the events on which a database instance waited.

F) They provide Information to the Optimizer so that it can determine optimal execution plans for SQL statements.

Answer:DF

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