新初始化登陆后，执行show databases  提示：

ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

执行 set password for root@localhost = password('root')；

有如下报错：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'database' at line 1

改用： alter user root set pawwsord=PASSWORD('root123456');有另一个报错：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set pawwsord=PASSWORD('root123456')' at line 1

改用：alter user 'root'@'localhost' identified by 'root123456';

执行成功。