应用场景二：读写分离 DBLE除了做数据的分片功能外，也支持读写分离功能；开启读写分离功能后，可以将主实例上的读压力负载给原本stand by的从实例，从而扩展整个集群的吞吐能力； 后端MySQL节点 我们再通过示例， ...

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You want to return the current date and time from the user session, with a data type of TIMESTAMP WITH TIME ZONE Which function will do this? A) CURRENT DATE B) CURRENT_ TIMESTAMP C) SYSDATE D) LOCALT ...

Which two statements will return the names of the three employees with the lowest salaries? A) SELECT last_ name, salary FROM employees FETCH FIRST 3 ROWS ONLY ORDER BY salary; B) SELECT last name, ...

Which two statements execute successfully? A SELECT TO_ DATE('2019-DEC-25 15:30'， 'YYYY-MON-DD HH24:MI', 'NLS_ DATE_ LANGUAGE =AMERICAN' ) FROM DUAL; B SELECT TO_CHAR('2019-DEC-25 15:30"， YY-MON-D H ...

Which two statements cause changes to the data dictionary? A) DELETE FROM scott. emp; B) GRANT UPDATE ON scott. emp TO fin manager; C) AITER SESSION set NLs. _DATE FORMAT = 'DD/MM/YYYY'; D) TRUNCATE ...

Which two statements are true about * TABLES views? A) You must have SELECT privileges on a table to view it in ALL TABLES. B) You must have SELECT privileges on a table to view it in DBA TABLES. C) ...

Which two statements are true about * TABLES views? A) You must have SELECT privileges on a table to view it in ALL TABLES. B) You must have SELECT privileges on a table to view it in DBA TABLES. C) ...