MySQL 误删用户

误删除root用户&误删除所有用户

#-------------------------------------------------------------------------------
#忘记root密码 登录并修改root密码 beign
#-------------------------------------------------------------------------------

mysqld_safe --skip-grant-tables --skip-networking &
[root@db01-sa ~]# mysql
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 1
Server version: 5.6.38 Source distribution

Copyright (c) 2000, 2017, 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> 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('123') where user='root' and host='localhost';
Query OK, 1 row affected (0.98 sec)
Rows matched: 1  Changed: 1  Warnings: 0

[root@db01-sa ~]# /etc/init.d/mysqld restart
Shutting down MySQL.. SUCCESS! 
Starting MySQL.180620 13:09:10 mysqld_safe mysqld from pid file /application/mysql/data/db01-sa.pid ended
.... SUCCESS! 
[1]+  Done                    mysqld_safe --skip-grant-tables --skip-networking

[root@db01-sa ~]# mysql -uroot -p123
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.6.38 Source distribution

Copyright (c) 2000, 2017, 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> 

#-------------------------------------------------------------------------------
#忘记root密码 登录并修改root密码 end
#-------------------------------------------------------------------------------


#-------------------------------------------------------------------------------
#误删除所有用户 beign
#-------------------------------------------------------------------------------

#模拟情况
select user,host,password from mysql.user;
mysql> drop user root@'localhost';

#开始处理
[root@db01-sa ~]# /etc/init.d/mysqld stop
[root@db01-sa ~]#mysqld_safe --skip-grant-tables --skip-networking &
[root@db01-sa ~]# mysql



mysql> INSERT INTO mysql.user VALUES ('localhost','root',
    -> '','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y',
    -> 'Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y',
    -> '','','','',0,0,0,0,'mysql_native_password','','N');
Query OK, 1 row affected (0.00 sec)

mysql> update mysql.user set password=PASSWORD('123') where user='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0


mysql> select user,host,password from mysql.user;
+------+-----------+-------------------------------------------+
| user | host      | password                                  |
+------+-----------+-------------------------------------------+
| root | localhost | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
+------+-----------+-------------------------------------------+
row in set (0.08 sec)


[root@db01-sa ~]# /etc/init.d/mysqld restart
Shutting down MySQL..180620 13:19:15 mysqld_safe mysqld from pid file /application/mysql/data/db01-sa.pid ended
 SUCCESS! 
Starting MySQL..... SUCCESS! 
[1]+  Done                    mysqld_safe --skip-grant-tables --skip-networking
[root@db01-sa ~]# mysql
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
[root@db01-sa ~]# mysql -uroot -p123
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.6.38 Source distribution

Copyright (c) 2000, 2017, 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> select user,host,password from mysql.user;
+------+-----------+-------------------------------------------+
| user | host      | password                                  |
+------+-----------+-------------------------------------------+
| root | localhost | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
+------+-----------+-------------------------------------------+
1 row in set (0.00 sec)

#-------------------------------------------------------------------------------
#误删除所有用户 end
#-------------------------------------------------------------------------------

其实做到以上下面的就不用看了

############################################################################

如果遇到以上处理权限不足的补充处理

----add begin  by nod 18-06-21------

备注：可能会有权限不够的情况
处理方式：


INSERT INTO mysql.user VALUES ('localhost','root',
'','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y',
'Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y',
'','','','',0,0,0,0,'mysql_native_password','','N');


mysql> update mysql.user set password=PASSWORD('123') where user='root';


[root@db01-sa ~]# /etc/init.d/mysqld restart
Shutting down MySQL..180621 08:08:27 mysqld_safe mysqld from pid file /application/mysql/data/db01-sa.pid ended
 SUCCESS! 
Starting MySQL..... SUCCESS! 
[1]+  Done                    mysqld_safe --skip-grant-tables --skip-networking
[root@db01-sa ~]# mysql -uroot -p123
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 1
Server version: 5.6.38 Source distribution

Copyright (c) 2000, 2017, 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.

----add end  by nod 18-06-21------