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Password Policy

When it is running on Windows Server 2003 or later versions, SQL Server 2005 can use Windows password policy mechanisms.

SQL Server 2005 can apply the same complexity and expiration policies used in Windows Server 2003 to passwords used inside SQL Server. This functionality depends on the NetValidatePasswordPolicy API, which is only available in Windows Server 2003 and later versions.
Password ComplexityPassword Complexity

Password complexity policies are designed to deter brute force attacks by increasing the number of possible passwords. When password complexity policy is enforced, new passwords must meet the following guidelines:

* The password does not contain all or part of the account name of the user. Part of an account name is defined as three or more consecutive alphanumeric characters delimited on both ends by white space such as space, tab, and return, or any of the following characters: comma (,), period (.), hyphen (-), underscore (_), or number sign (#).
* The password is at least eight characters long.
* The password contains characters from three of the following four categories:
o Latin uppercase letters (A through Z)
o Latin lowercase letters (a through z)
o Base 10 digits (0 through 9)
o Non-alphanumeric characters such as: exclamation point (!), dollar sign ($), number sign (#), or percent (%).

Passwords can be up to 128 characters long. You should use passwords that are as long and complex as possible.