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Three Tier Architecture Of R/3 SAP System.

Database Server
Application Server
Presentation Server

(Unlike normal Client/server architecture where you have only two layers i.e., client and server.)

Communication among the 3 tiers is accomplished by standard protocol services like TCP/IP or CPIC (Common Programming Interface Communication).

In above case database server stores the data centrally. Basically contains database engine and associated processes. The database layers contain the database system used by all servers.

Application server contains software components to run the program. It contains a SAP kernel, which can run ABAP/4 program.

The presentation server is your client through which you send your request to application server. It is also called as SAP graphical user interfaces known as SAPGUI and is available in windows 3.1, Windows NT, Windows 95, and Macintosh. They all look similar whatever underlying system they are running on.

The SAPGUI includes all graphical capabilities of window interface with menu bars, tool bars, focus property, and the entire mouse clicking operations.

The R/3 system is open system in the sense that it can run on any operating system or any database and any communication technology. It means that:
• R/3 system can run on any operating system platform such as UNIX, NT, 95, AS/400.
• It supports various RDBMS such as SQL server, Oracle, Informix, DB2.
• Standard GUIs supported by R/3 are Windows 95, NT, Windows 3.1, and Macintosh.
• SAP can use standard communication protocols TCP/IP, CPIC, OSF/DCE/DME for network.

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