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SQL Server FAQ - Security Model Used in SQL Server 2005

By: FYIcenter.com

(Continued from previous topic...)

What Is the Security Model Used in SQL Server 2005?

SQL Server 2005 uses a very standard security model involves 3 concepts:

  • Securables - Entities representing resources that need to be secured. For example, a database table is a securable.
  • Principals - Entities representing users that request accesses to resources. For example, a login user is a principal.
  • Permissions - Types of accesses associated with securables. Permissions can be granted to or revoked from principals. For example, "Update" is a permission associated a securable, table "R". "Update" on "R" can be granted to a principal, user "U". Now user "U" will get "Update" access on table "R".

In simple terms, a principal answers the security question of "Who are you?"; a securable answers the security question of "What is your target object?"; a permission answers the security question of "You are allowed to perform this action on this target object".

SQL Server 2005 supports multiple securables and multiple principals organized into hierarchical structures as shown in this picture:
SQL Server Security Model
(Picture by Microsoft)

(Continued on next topic...)

  1. What Is the Security Model Used in SQL Server 2005?
  2. What Are Security Principals Used in SQL Server 2005?
  3. What Is the Security Principal at the Server Level That Represents Your Session?
  4. What Is the Security Principal at the Database Level That Represents Your Session?
  5. How To Create a New Login Name in SQL Server?
  6. How To Verify a Login name with SQLCMD Tool?
  7. How To List All Login Names on the Server?
  8. How To Change the Password of a Login Name?
  9. How To Change a Login Name?
  10. How To Disable a Login Name?
  11. How To Delete a Login Name?
  12. How To Create a User Name in a Database?
  13. How To List All User Names in a Database?
  14. How To Find the Login Name Linked to a Given User Name?
  15. How To Verify a User name with SQLCMD Tool?
  16. How To Change the Name of a Database User?
  17. How To Delete an Existing Database User?

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