mysql\> SHOW SLAVE STATUSIG 

*********************************1. row****************************

 Slave_ I0_ Running: Yes 

Slave_ SQL_ Running: Yes 

seconds_ Behind_ Master: 1612 

Seconds_ Behind_ Master value is steadily growing

 What are two possible causes? (Choose two.) 

mysql\> GRANT r_read@localhost To mark WITH ADMIN OPTION; 

Which two are true? (Choose two.) 

dropMetadataSchema() 

Which two statements are true?

While you were manipulating files, all files were accidentally deleted from the top-level data directory. （在 innodb_fast_shutdown=0 的情况下执行了干净关机 在操作文件时，所有文件都意外地从顶级数据目录中删除）

Which two files must be restored from backup to allow the DB to restart cleanly? （必须从备份还原哪两个文件才能使数据库干净地重新启动）

 Which three methods are supported? （您必须在单个主机上运行多个 MySQL 服务器实例 支持哪三种方法）

Myswl\> SHOW GRANTS FOR jsmith; 

+----------------------------------------------------------------------------- -+

 |Grants for jsmith@% | 

+----------------------------------------------------------------------------- -+ 

|GRANT USAGE ON *.* TO jsmith’@’%’ | |GRANT UPDATE(Name)ON ‘world’. ‘country’TO ‘jsmith ‘@’%’| 

+----------------------------------------------------------------------------- --+ 

2 rows in set (0.00 sec) 

Which two SQL statement can jsmith execute?（jsmith 可以执行哪两条 SQL 语句）