单项选择题
A.Mysqld uses internal configuration versioning and reverts to the previous configuration
B.When using mysql_config_editor for configuration adjustments, it detects incorrect syntax and typing mistakes
C.The mysqld_safe script skips the unknown variable and starts using the remaining configuration changes
D.Mysqld prints to the error log about an unknown variable, and then exits
单项选择题 Which High Availability solution can provide a consistent, time-delayed (for example, one hour) snapshot of the live production database?（）
单项选择题 Which MySQL utility program should you to process and sort the slow Query log based on query time or average query time?（）
单项选择题 Review the definition of the phone_list view. CHEATE OR REPLACE ALGORITHM=MERGE DEFINER= root@localhost SQL SECURITY DEFINER VIEW phone_list AS SELECT e . id as id e . first_name AS first_name e . last_name AS last_name coalesce ( ph1.phone_no, – ) AS office_no coalesce (ph2 .phone_no, – ) AS cell_no FROM employees e LEFT JOIN employee_phone ph1 ON ph1.emp_id = e.id AND ph1.type = office LEFT JOIN employee_phone ph2 ON ph2 .emp_id = e.id AND ph2 .type = mobile The tables employees and employee_phone are InnoDB tables; all columns are used in this view. The contents of the phone_list view are as follows: Mysql> select * from phone_list; 1 row in set (0.00 sec) Which method can you use to change the cell_no value to 555-8888 for John Doe?（）