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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。
1、退出mysql
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[root@localhost src]# service mysqld stop
停止mysqld： [确定]
[root@localhost src]#
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2、进入sql安全模式，命令“/usr/bin/mysqld_safe --skip-grant-table &”
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[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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3、无密码方式登录，命令“mysql –u root”
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[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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4、使用mysql，命令“use mysql；”
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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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5、重设root密码，命令“update user set password=password (“密码”) where user=’root’”
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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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6、刷新
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mysql> flush privileges;
query ok, 0 rows affected (0.00 sec)
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7、退出，重新登录
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[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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