mysql报错Mysql ERROR 1045 (28000): Access denied for user 'root'@'localhost'问题

[root@centos yum.repos.d]# /etc/init.d/mysqld stop  

停止 mysqld： [确定]

[root@centos yum.repos.d]# mysqld_safe --user=mysql --skip-grant-tables --skip-networking & 

[1] 8307

[root@centos yum.repos.d]# 130531 01:08:38 mysqld_safe Logging to '/var/log/mysqld.log'.

130531 01:08:38 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

^C

[root@centos yum.repos.d]# ^C

[root@centos yum.repos.d]# mysql -u root mysql 

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

 

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 1

Server version: 5.1.69 Source distribution

 

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

 

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

 

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

 

mysql> select  host, user from user; 

Empty set (0.00 sec)

 

mysql> show databases;

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

| Database           |

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

| information_schema |

| mysql              |

| test               |

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

3 rows in set (0.00 sec)

 

mysql> select  host, user from user; 

Empty set (0.00 sec)

 

mysql> use mysql;

Database changed

mysql> select  host, user from user; 

Empty set (0.00 sec)

 

mysql>  UPDATE user SET Password=PASSWORD('123456') where USER='root';

Query OK, 0 rows affected (0.00 sec)

Rows matched: 0  Changed: 0  Warnings: 0

 

mysql> desc user;

ERROR 1 (HY000): Can't create/write to file '/tmp/#sql_20d3_0.MYI' (Errcode: 13)

mysql> desc USER;

ERROR 1 (HY000): Can't create/write to file '/tmp/#sql_20d3_0.MYI' (Errcode: 13)

mysql> insert into user(user,password) values('root',PASSWORD('123456'));

Query OK, 1 row affected, 3 warnings (0.00 sec)

 

mysql> FLUSH PRIVILEGES;  

Query OK, 0 rows affected (0.00 sec)

 

mysql> quit

Bye

[root@centos yum.repos.d]# /etc/init.d/mysqld restart

130531 02:00:39 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

停止 mysqld： [确定]

正在启动 mysqld： [确定]

[1]+  Done                    mysqld_safe --user=mysql --skip-grant-tables --skip-networking

[root@centos yum.repos.d]# ps -ef  | grep mysql

root      8452     1  0 02:00 pts/4    00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysql

mysql     8554  8452  0 02:00 pts/4    00:00:00 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock

root      8563  7506  0 02:00 pts/4    00:00:00 grep mysql

[root@centos yum.repos.d]# mysql -uroot -p

Enter password: 

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.1.69 Source distribution

 

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

 

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

 

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

 

mysql> show databases;

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

| Database           |

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

| information_schema |

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

1 row in set (0.00 sec)

 

mysql> show databases;

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

| Database           |

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

| information_schema |

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

1 row in set (0.00 sec)