SAP R/3 Architecture
SAP R/3 Architecture facilitates all business transactions of an organisation and connects them together using real-time integration. Real-time integration ensures that any change or upgrade in one application causes the data to be modified or updated automatically in the other applications involved.
We know that SAP R/3 Architecture, particularly the client-server software. This ensures that the groups / layers that make up the R/3 system are built to operate concurrently through a variety of different computer systems.When a company instals SAP software, each part (or “layer” in the case of R/3) is stored, controlled and processed via the hardware of separate and specialised computer systems.
Each layer is capable of calling on all of the other layers built to complete the job.Such components/layers that request services are called “clients,” such components/layers that deliver services are called “servers.” This is the term-“client/server.
The three Conceptual Layers of this R/3 Architecture are … the classic configuration of the R/3 Framework includes the following layers of software:
The Presentation Layer
Receives input from the user and generates a method request. Presentation Layer is an interface for the user and a variety of different graphical user interfaces ( GUIs) can be used. SAPGUI is SAP’s own user interface programme (over 20 languages).
Usually, the presentation or GUI layer collects keyboard / mouse data from the user and sends the data to the application layer in the form of process requests for further processing. When the layer receives output from the application layer, it reformats the data and displays text and graphical data on the user’s PC screen.
The Application Layer
Uses the Software Logic Application to receive and process a request for a process.
The application layer consists of the core components of R/3. The bulk of R/3 business logic processing takes place in the application server layer. This is where the dispatcher controls the job procedures.
Application servers provide the complete logic of R/3 applications for business processes. The number of different application servers may be linked to a network, spread geographically.
The Database Layer
stores and recovers all data.Database Layer handles both the application elements of the R/3 Framework and the working data of the enterprise. Applications are downloaded from the database as needed, loaded into the application layer, and run from there.
The database layer includes an engine whose sole function is to store and retrieve data on behalf of the application layer. SAP R/3 uses the industry-standard database access language SQL (pronounced “SEE”-“QUEL”-Structured Query Language) as an interface for accessing its supporting database
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