Knowledge Sharing: Maximum Length of UserName and password in SQL Server 2005

Hello Experts,

Greeting of the day!

Today one of my collegues asked about the maximum length of a SQL Server USerName and Password. I checked into the system tables/views and found the following:

A)

Object Name: sys.sysusers
Column Name: Name
Type: sysname
Length: 256

Column Name: password
Type: varbinary
Length: 256

B)

Object Name: sys.syslogins
Column Name: Name
Type: sysname
Length: 256
Collation: SQL_Latin1_General_CP1_CI_AS

Column Name: loginname
Type: sysname
Length: 256

Column Name: password
Type: sysname
Length: 256

From this, I concluded that the maximum character length of a SQL Server Username and Password should be 256. Now when I created a login,user and password with 256 characters or more, SQL Server readily accepted it but were trimmed. The final result which I got is:

Maximum character length of username: 115
Maximum character length of login: 115
Maximum character length of password: 128
Username Accepts: Alphabets, Numeric and special characters
Login Accepts: Alphabets, Numeric and special characters
Password Accepts: Alphabets, Numeric and special characters

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