SAP R3 ARCHITECTURE INTRODUCTION
With SAP R/3, SAP ushers in a new generation of enterprise software —
from mainframe computing (client-server architecture) to the three-tier
architecture of database, application, and user interface.
Presentation Server
The Presentation Layer contains the software components that make
up the SAP gui (graphical user interface). This layer is the interface between
the R/3 System and its users. The R/3 System uses the SAP gui to provide an
intuitive graphical user interface for entering and displaying data.
The presentation layer sends the user's input to the application
server, and receives data for display from it. While a SAP gui component is
running, it remains linked to a user's terminal session in the R/3 System.
Application Server
The Application Layer consists of one or more
application servers and a message server. Each application server contains a
set of services used to run the R/3 System. Theoretically, you only need one
application server to run an R/3 System. In practice, the services are
distributed across more than one application server. The message server is
responsible for communication between the application servers. It passes
requests from one application server to another within the system. It also
contains information about application server groups and the current load
balancing within them. It uses this information to assign an appropriate server
when a user logs onto the system.
Database Layer
The Database Layer
consists of a central database system containing all of the data in the R/3
System. The database system has two components - the database management system
(DBMS), and the database itself. SAP has manufactured its own database named
Hana but is compatible with all major databases such as Oracle.All R/3 data is
stored in the database. For example, the database contains the control and
customizing data that determine how your R/3 System runs. It also contains the
program code for your applications. Applications consist of program code,
screen definitions, menus, function modules, and various other components.
These are stored in a special section of the database called the R/3
Repository, and are accordingly called repository objects. R/3 repository,
objects are used in ABAP workbench .
For SAP ERP Training or SAP R3 Architecture Module Training please visit the links.
For SAP ERP Training or SAP R3 Architecture Module Training please visit the links.
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