MySQL5.7忘記root密碼的處理方式

本篇內容主要講解“5.7忘記root密碼的處理方式”，感興趣的朋友不妨來(lái)看看。本文介紹的方法操作簡(jiǎn)單快捷，實(shí)用性強。下面就讓小編來(lái)帶大家學(xué)習“MySQL5.7忘記root密碼的處理方式”吧!

MySQL忘記root密碼，而且不能使用操作系統認證直接進(jìn)入數據庫修改密碼時(shí)，需要重置root密碼。
1、在配置文件/etc/my.cnf添加skip-grant-tables一行，跳過(guò)密碼驗證。
2、重啟mysql數據庫主進(jìn)程# /etc/init.d/mysqld restart（也可以直接先停掉MySQL進(jìn)程后使用skip-grant-tables參數重啟MySQL）
3、登錄數據庫修改密碼。
mysql> update user set authentication_string=password('') where user='root' and host='localhost';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> exit
這里需要修改的字段是authentication_string，這點(diǎn)和之前的版本不同。
4、這個(gè)時(shí)候，如果你設置的密碼太簡(jiǎn)單，則在數據庫執行任何命令都會(huì )報類(lèi)似如下錯誤：
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> show database;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'database' at line 1
mysql> update user set authentication_string=password('mysql') where user='root' and host='localhost';
ERROR 1046 (3D000): No database selected
mysql> use mysql;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
5、注意：如果只想設置簡(jiǎn)單密碼需要修改兩個(gè)全局參數：
mysql> set global validate_password_policy=0;
mysql> set global validate_password_length=1;
mysql> set global validate_password_policy=0;
       Query OK, 0 rows affected (0.00 sec)
mysql> set global validate_password_length=1;
       Query OK, 0 rows affected (0.00 sec)
mysql> set password=password("mysql");
Query OK, 0 rows affected, 1 warning (0.00 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
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