忘记root密码
如果不小心忘记了root密码，那么mysql就不能再登录了，这时就要重置root密码才行。通过下面的步骤，我们可以重新设置root密码。
退出mysql
[root@localhost src]# service mysqld stop
停止mysqld： [确定]
[root@localhost src]#
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进入sql安全模式，命令“/usr/bin/mysqld_safe --skip-grant-table &”
[root@localhost src]#/usr/bin/mysqld_safe --skip-grant-table &
[1] 6332
[root@localhost src]# 180814 10:10:00 mysqld_safe Logging to '/var/log/mysqld.log'.
180814 10:10:00 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
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无密码方式登录，命令“mysql –u root”
[root@localhost src]# mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.1.71 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>
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使用mysql，命令“use mysql；”
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql>
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重设root密码，命令“update user set password=password (“密码”) where user=’root’”
mysql> update user set password=password('123456') where user='root';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3 Changed: 3 Warnings: 0
mysql>
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刷新
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
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退出，重新登录
[root@localhost src]# mysql -u root -p
Enter password: //这里输入新密码
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Sever version: 5.1.71 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>
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链接:https://pan.baidu.com/s/1GOLVU2CbpBNGtunztVpaCQ 密码:n7bk
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