SQL Server Security Architecture: Logins, Users, Roles & Permissions Explained #269561 (License: Personal Use)

This diagram illustrates the layered security model in SQL Server, where a login (MyAccount) is granted access to two databases-MyDb and SomeOtherDb-and within MyDb, the user becomes a member of roles like db_ddladmin and MyDbUsers, which authorize access to tables, views, and stored procedures. The structure highlights separation between server-level authentication and database-level authorization, including explicit grants and role-based permissions. It also shows how service accounts (e.g., bulkadmin) can be assigned server roles independently.

Used in database administration tutorials, SQL Server documentation, and security best-practice guides; targets DBAs and developers learning permission delegation, role mapping, and cross-database access control.