1、在命令行输入命令
root@centos64 mysql]# /usr/bin/mysqld_safe --skip-grant-tables&
2. 再启一个终端执行下面的一系列命令：
[root@centos64 proc]# mysql welcome to the mysql monitor. commands end with ; or \g. your mysql connection id is 1 server version: 5.6.13 mysql community server (gpl) 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> update user set password=password('admin') where user='root'; error 1046 (3d000): no database selected mysql> show databases ; +--------------------+ | database | +--------------------+ | information_schema | | mysql | | performance_schema | | test | +--------------------+ 4 rows in set (0.06 sec) 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> update user set password=password('admin') where user='root'; query ok, 4 rows affected (0.04 sec) rows matched: 4 changed: 4 warnings: 0 mysql> flush privileges; 也可以不用。 mysql> exit bye
注意，就是有可能，user表中根本就没有root这个用户。
如果没有此用户，用：
mysql> insert into mysql.user(host,user,password,ssl_cipher,x509_issuer,x509_subject) values("localhost","root",password("admin"),"","",""); query ok, 1 row affected (0.10 sec)
3.授权。 给所有的权限
mysql> grant all privileges on *.* to 'root'@'localhost' identified by 'admin' ; query ok, 0 rows affected (0.06 sec) mysql> flush privileges;
再以正常的方式启动即可。
以上就是mysql之——忘记root密码如何操作的内容。