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i m now Microsoft Certified technology specialist in
MS SQL Server 2005: Implementation & maintenance.

security in SQL Server 2005

LOGIN Vs USER

A LOGIN give you connection rights.

• It is stored in the MASTER database
• Applies to the instance
• Has no permissions directly per se Exception: Server Role membership
• Mapped to a user for permissions

A database USER is the permissions container

• Also the schema owner
• Permissions are granted to database users, not logins
• Specific to a single database

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Access and Authentication - Principals

Windows-level principals

• Windows Domain Login
• Windows Local Login

SQL Server-level principal

• SQL Server Login

Database-level principals

• Database User
• Database Role
• Application Role

** DENY at any level always take precedence.