Link  between LANDSCAPE AND R/3

hi gurus i have doubt. that what is the difference between DEV,QUALITY AND PRODUCTION SERVERS AND DATABASE, APPLIACATION, PRESENTATION.
initailly while we are in implementation we use DEV,QUALITY AND PRODUTION.
after impllementation DATABASE, APPLICATION AND PRESENTATION comes into picture. so in landscape good configuration sits in production server. so for end user point of u PRODUCTION SERVER WILL BECOME DATABASE SERVER OR NOT. pls tell me the link between landscape and R/3.
will reward

Hi Krishna,
I think you are trying to mix 2 questions.
Well you can frame the questions like this:
1) Difference between Development, Quality and Production Servers
2) Database, application and presentation layer.
Well the point1) refers to Landscape. What happens is when are working for any end to end implemetation or support project we need certain instances so we can have instances like Development, Quality and Production. we have got different instances because we need to test whether the changes made are working as per the requirements.
Point 2)  refers to R/3 technology.
SAP R/3 is based on a three tier client/server technology. Typically, it is made up of three functionally distinct layers namely: the user interface, business logic and database.
The user interface, which is otherwise known as the presentation server displays the interface for users' communication with the SAP system. It is often referred to as the SAP GUI. As a matter of fact, it is a program called sapgui.exe. The application server is where the business logic and data manipulation takes place. Data processing, SAP administration tasks and client request/feedback management are handled within the business layer. The database layer is synonymous to the database server and it typically acts as a data repository for tables and other database objects and structures.
Ideally, an R/3 system is composed of one database server, one or more application servers and one or more presentation servers.
Hope this helps you.
Do award points if you found them useful.
Regards,
Rakesh

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