2、Which two are true about Optimizer Statistics?

OCP最新题库解析系列。❑ A) They do not persist across Instance restarts.

www.9778.com,❑ B) They are automatically updated when DDL statements execute.

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

❑ 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