2018版OCP 11g 052最新考试题库整理（带答案）（2）
2018-08-17 09:46
851 查看
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
北京CUUG整理，转载请注册
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
北京CUUG整理，转载请注册
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 