r/3 architecture – SAP EWM Help

r/3 architecture – SAP EWM Help https://www.sapewmhelp.com SAP EWM questions answered by experts — ABAP, S/4HANA, warehouse management Sat, 02 Aug 2025 12:17:02 +0000 en-US hourly 1 https://wordpress.org/?v=7.1 SAP R/3 Architecture https://www.sapewmhelp.com/question/sap-r-3-architecture/ https://www.sapewmhelp.com/question/sap-r-3-architecture/#respond Sat, 02 Aug 2025 12:17:02 +0000 https://www.sapewmhelp.com/?question=sap-r-3-architecture SAP R/3 is based on a 3-tier client-server architecture, which separates presentation, application, and database layers. This design provides scalability, flexibility, and better performance.

Three-Tier Architecture:

1. Presentation Layer (Client Tier)

Interface between the user and SAP system
Usually a SAP GUI or web browser
Sends user input to the application server and displays output
Example: Entering a sales order in SAP GUI

2. Application Layer (Middle Tier)

- Core processing engine of SAP R/3
- Handles:
  - Business logic
  - Running ABAP programs
  - Communicating with the database
  - Managing user sessions
- Multiple application servers can run in parallel (load balancing)

3. Database Layer (Back-End Tier)
- Stores all data including:
  - Business data (e.g., orders, customers)
  - Customizing settings
  - Repository objects (tables, programs, etc.)
- Typically uses Oracle, SAP HANA, MS SQL Server, etc.

Concepts:

Dispatcher: Manages requests in the app server.
Work Processes: Carry out specific tasks (Dialog, Background, Update, etc.).
Message Server: Distributes load between application servers.
Gateway: Manages communication with external systems.

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