CentOS6.4下安装MySQL5.6.10后root无法登陆MySQL

 启动MySQL后root无法登陆

[root@localhost mysql]# /usr/bin/mysql -u root -p

Enter password: 

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

解决办法：

    1.停止MySQL  

      [root@localhost mysql]# service mysql stop

    2.启动MySQL安全模式

      [root@localhost mysql]# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

      mysql -u root mysql

    3.更改root密码

      mysql> UPDATE user SET Password=PASSWORD('sa') where USER='root';

Query OK, 4 rows affected (0.01 sec)

Rows matched: 4  Changed: 4  Warnings: 0

 

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

 

mysql> quit

Bye

 

    4.重新登录后，无法执行show databases;

      mysql> show databases;

ERROR 1820 (HY000): You must SET PASSWORD before executing this statement

 

    5.重新设置密码

      mysql> SET PASSWORD = PASSWORD('sa');

Query OK, 0 rows affected (0.00 sec)

 

mysql> show databases;

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

| Database           |

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

| information_schema |

| mysql              |

| performance_schema |

| test               |

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

4 rows in set (0.01 sec)