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1、修改默认密码
(在开始前看一下mysql库中 user表中的root用户有多少个，如果特别多的话找到自己修改的，在修改时限制自己要修改的用户)

mysql> update user set password=password("mima") where user="root";  #修改密码报错
ERROR 1054 (42S22): Unknown column 'password' in 'field list'
mysql> update mysql.user set authentication_string=password('mima') where user='root';  #修改密码成功
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1mysql> flush privileges;  #立即生效
Query OK, 0 rows affected (0.00 sec)mysql> quit
Bye

2、授予权限

GRANT ALL PRIVILEGES ON *.* to 'root'@'333.333.333.333' IDENTIFIED BY 'mima' with GRANT OPTION;

3、刷新用户权限

flush privileges;