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【OCP|052】OCP最新题库解析系列-2

程序员文章站 2022-06-02 10:59:17
2、Which two are true about Optimizer Statistics? ❑ A) They do not persist across Instance restarts. ❑ B) They are automatically updated when DDL state ......

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