现象：设置简单密码会报错：
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
原因：
原来MySQL5.6.6版本之后增加了密码强度验证插件validate_password，相关参数设置的较为严格。使用了该插件会检查设置的密码是否符合当前设置的强度规则，若不满足则拒绝设置。影响的语句和函数有：create user,grant,set password,password(),old password。
解决：
该问题其实与mysql的validate_password_policy的值有关，查看一下msyql密码相关的几个全局参数：
**[sql]** [view plain](http://blog.csdn.net/youshounianhua123/article/details/79606581# "view plain")[copy](http://blog.csdn.net/youshounianhua123/article/details/79606581# "copy")
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1. mysql> select @@validate_password_policy;
2. +----------------------------+
3. | @@validate_password_policy |
4. +----------------------------+
5. | MEDIUM |
6. +----------------------------+
7. 1 row in set (0.00 sec)
10. mysql> SHOW VARIABLES LIKE 'validate_password%';
11. +--------------------------------------+--------+
12. | Variable_name | Value |
13. +--------------------------------------+--------+
14. | validate_password_dictionary_file | |
15. | validate_password_length | 8 |
16. | validate_password_mixed_case_count | 1 |
17. | validate_password_number_count | 1 |
18. | validate_password_policy | MEDIUM |
19. | validate_password_special_char_count | 1 |
20. +--------------------------------------+--------+
21. 6 rows in set (0.08 sec)
参数解释
validate_password_dictionary_file
插件用于验证密码强度的字典文件路径。
validate_password_length
密码最小长度，参数默认为8，它有最小值的限制，最小值为：validate_password_number_count + validate_password_special_char_count + (2 * validate_password_mixed_case_count)
validate_password_mixed_case_count
密码至少要包含的小写字母个数和大写字母个数。
validate_password_number_count
密码至少要包含的数字个数。
validate_password_policy
密码强度检查等级，0/LOW、1/MEDIUM、2/STRONG。有以下取值：
<u style="box-sizing: border-box;">Policy Tests Performed </u>
0 or LOW Length
1 or MEDIUM Length; numeric, lowercase/uppercase, and special characters
2 or STRONG Length; numeric, lowercase/uppercase, and special characters; dictionary file
默认是1，即MEDIUM，所以刚开始设置的密码必须符合长度，且必须含有数字，小写或大写字母，特殊字符。
validate_password_special_char_count
密码至少要包含的特殊字符数。
修改：
**[html]** [view plain](http://blog.csdn.net/youshounianhua123/article/details/79606581# "view plain")[copy](http://blog.csdn.net/youshounianhua123/article/details/79606581# "copy")
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1. mysql> set global validate_password_policy=0;
2. Query OK, 0 rows affected (0.05 sec)
4. mysql>
5. mysql>
6. mysql> set global validate_password_mixed_case_count=0;
7. Query OK, 0 rows affected (0.00 sec)
9. mysql> set global validate_password_number_count=3;
10. Query OK, 0 rows affected (0.00 sec)
12. mysql> set global validate_password_special_char_count=0;
13. Query OK, 0 rows affected (0.00 sec)
15. mysql> set global validate_password_length=3;
16. Query OK, 0 rows affected (0.00 sec)
18. mysql> SHOW VARIABLES LIKE 'validate_password%';
19. +--------------------------------------+-------+
20. | Variable_name | Value |
21. +--------------------------------------+-------+
22. | validate_password_dictionary_file | |
23. | validate_password_length | 3 |
24. | validate_password_mixed_case_count | 0 |
25. | validate_password_number_count | 3 |
26. | validate_password_policy | LOW |
27. | validate_password_special_char_count | 0 |
28. +--------------------------------------+-------+
29. 6 rows in set (0.00 sec)
