hi karthick,
In SAP architecture we come across with three tier architecture that is R1,r2,r3..
the main difference between these three architectures are dependent on the layers .....
1)presentation layer 2) application layer 3) database layer
presentation layer in presentation layers all end users logon to sap system
application layerin application layer , depending on scenario we run the processes given by users
database layer in database layer, all the required data can be taken from the database...layer
r1: in this architecture all the three layers will reside in single system.in this type of architecture the possiblity of changes will be less
r2: in this architecture application layer and presentation layer will reside in single system and database in different system, even though the process timinig of data is less , errors can be rectified to some extent
r3: coming to this architecture , all the three layers will reside in different systems , the probability of getting errors is less when compared to r1 and r3,,, so every production system is designed with r3 architecture...
