Mysql学习之--修改root用户口令
一、拥有原来的myql的root的密码
方法一：
在mysql系统外，使用mysqladmin
# mysqladmin -u root -p password "test123"
Enter password: 【输入原来的密码】
方法二：
通过登录mysql系统，
# mysql -uroot -p
Enter password: 【输入原来的密码】
mysql>use mysql;
mysql> update user set password=passworD("test") where user='root';
mysql> flush privileges;
mysql> exit;
二、忘记原来的myql的root的密码：
首先，你必须要有操作系统的root权限了。要是连系统的root权限都没有的话，先考虑root系统再走下面的步骤。
类似于安全模式登录系统，有人建议说是pkill mysql，但是我不建议哈。因为当你执行了这个命令后，会导致这样的状况：
/etc/init.d/mysqld status
mysqld dead but subsys locked
这样即使你是在安全模式下启动mysql都未必会有用的，所以一般是这样/etc/init.d/mysqld stop，如果你不幸先用了pkill，那么就start一下再stop咯。
# mysqld_safe --skip-grant-tables &
&，表示在后台运行，不再后台运行的话，就再打开一个终端咯。
# mysql
mysql> use mysql;
mysql> UPDATE user SET password=password("oracle") WHERE user='root';
mysql> flush privileges;
mysql> exit;
案例：
[root@ogg ~]# mysqld_safe --skip-grant-tables &[1] 3117
[root@ogg ~]# 140924 14:03:30 mysqld_safe Logging to '/var/lib/mysql/ogg.err'.
140924 14:03:30 mysqld_safe A mysqld process already exists
[1]+ Exit 1 mysqld_safe --skip-grant-tables
关闭mysql server：
[root@ogg ~]# service mysql stop
Shutting down MySQL.. [ OK ]
[root@ogg ~]# mysqld_safe --skip-grant-tables &
[1] 3243
[root@ogg ~]# 140924 14:03:48 mysqld_safe Logging to '/var/lib/mysql/ogg.err'.
140924 14:03:48 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
[root@ogg ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.1.47-log Source distribution
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use mysql
Database changed
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.01 sec)
mysql> show tables;
+---------------------------+
| Tables_in_mysql |
+---------------------------+
| columns_priv |
| db |
| event |
| func |
| general_log |
| help_category |
| help_keyword |
| help_relation |
| help_topic |
| host |
| innodb_index_stats |
| innodb_table_stats |
| ndb_binlog_index |
| plugin |
| proc |
| procs_priv |
| proxies_priv |
| servers |
| slave_master_info |
| slave_relay_log_info |
| slave_worker_info |
| slow_log |
| tables_priv |
| time_zone |
| time_zone_leap_second |
| time_zone_name |
| time_zone_transition |
| time_zone_transition_type |
| user |
+---------------------------+
29 rows in set (0.00 sec)
mysql> update user set password=PASSWORD('oracle') where user='root';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 4 Changed: 3 Warnings: 0
mysql> flush privileges;
ERROR 1033 (HY000): Incorrect information in file: './mysql/tables_priv.frm'
mysql> exit
Bye
[root@ogg ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.47-log Source distribution
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
错误信息：
[root@ogg mysql]# mysqld_safe --skip-grant-tables &
[1] 3795
[root@ogg mysql]# 140924 14:15:09 mysqld_safe Logging to '/var/lib/mysql/ogg.err'.140924 14:15:09 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql[root@ogg mysql]# mysqlWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.1.47-log Source distributionCopyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.This software comes with ABSOLUTELY NO WARRANTY. This is free software,and you are welcome to modify and redistribute it under the GPL v2 licenseType 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> use mysqlDatabase changed
mysql> flush privileges;
ERROR 1033 (HY000): Incorrect information in file: './mysql/tables_priv.frm'
mysql> exit
Bye
[root@ogg mysql]# service mysql stopShutting down MySQL.....140924 14:15:44 mysqld_safe mysqld from pid file /var/lib/mysql/ogg.pid ended [ OK ][1]+ Done mysqld_safe --skip-grant-tables[root@ogg mysql]# service mysql startStarting MySQL.. [ OK ] 正常连接： [root@ogg mysql]# mysql -u root -pEnter password:Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.6.4-m7-log Source distributionCopyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.This software comes with ABSOLUTELY NO WARRANTY. This is free software,and you are welcome to modify and redistribute it under the GPL v2 licenseType 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> use mysql;Database changedmysql> flush privileges;Query OK, 0 rows affected (0.00 sec)mysql>
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