备份数据库常用的工具有（）。

A.server-id
B.log-bin=mysql-bin
C.relay-log=mysql-relay
D.binlog_format=ROW

A.service mysql d restart
B./etc/init.d/mysql d restart
C.service mysql d reload
D.service my sql d stop

A.SET PASSWORD FOR’root’@’localhost’=PASSWORD（’newpass’）
B.ALTER user SET Password=PASSWORD（’newpass’）WHERE user=’root’
C.UPDATE user SET Password=PASSWORD（’newpass’）WHERE user=’root’
D.mysqladmin -u root password"newpass"