刪錯了user表root也連不上去了，然後我們可以理解為root密碼不知道了，忘記了。使用此類方法來找回root，再對刪除後的user重新創建。還好不是線上的。。。



1.修改MySQL的登錄設置： 
# vim /etc/my.cnf 
在[mysqld]的段中加上一句：skip-grant-tables 
例如： 
[mysqld] 
datadir=/var/lib/mysql 
socket=/var/lib/mysql/mysql.sock 
skip-grant-tables 
保存並且退出vi。

2．重新啟動mysqld 
# service mysqld restart 
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]

 
3．登錄並修改MySQL的root密碼 
# mysql 
Welcome to the MySQL monitor. Commands end with ; or \g. 
Your MySQL connection id is 3 to server version: 3.23.56 
Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the buffer. 
mysql> USE mysql ; 
Database changed 
mysql> UPDATE user SET Password = password ( ‘new-password
 
‘ ) WHERE User = ‘root‘ ; 
Query OK, 0 rows affected (0.00 sec) 
Rows matched: 2 Changed: 0 Warnings: 0 
mysql> flush privileges ; 
Query OK, 0 rows affected (0.01 sec) 
mysql> quit

4．將MySQL的登錄設置修改回來 
# vim /etc/my.cnf 
將剛才在[mysqld]的段中加上的skip-grant-tables刪除 
保存並且退出vim

5．重新啟動mysqld 
# service mysqld restart 
 

Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]

mysql刪錯user表，忘記root密碼