What are the advantages of a 3-tier architecture?

Splitting a system into presentation, application, and database layers brings several practical benefits over a simpler, tightly-coupled design.

• Independent scalability — add more application servers to handle more users, without touching the database or presentation layers.
• Centralized business logic — logic lives on the application server, not scattered across individual user machines, making it easier to maintain and update consistently.
• Improved security — end-user devices never connect directly to the database, reducing the attack surface for sensitive data.
• Flexibility in deployment — each layer can run on separate hardware suited to its specific workload (e.g. powerful database hardware, separate from application processing hardware).

This separation of concerns is a big part of why SAP systems can scale from small installations to supporting tens of thousands of concurrent users across large global enterprises.

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