单项选择题 Given: What is the result?（）

多项选择题 You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）

单项选择题 A simple master-to-slave replication is currently being used. The following information is extracted from the SHOW SLAVE STATUS output: Last_SQL_Error: Error 'Duplicate entry '8' for key 'PRIMARY' ' on query. Default database: 'mydb'. Query: 'insert into mytable VALUES ('8' , 'George') ' Skip_Counter: 0 Retrieved _Gtid_Set: 38f32e23480a7-32a1-c323f78067fd37821: 1-8 Auto _Position: 1 You execute a "SHOW CREATE TABLE mytable" on the slave: CREATE TABLE 'mytable' ( 'ID' int(11) NOT NULL DEFAULT '0', 'name' char(10) DEFAULT NULL, PRIMARY KEY ('ID') ) The table mytable on the slave contains the following: You have issued a STOP SLAVE command. One or more statements are required before you can issue a START SLAVE command to resolve the duplicate key error. Which statement should be used（）