Answer / kapil

Presentation Layer :
These components are responsible for the presentation of
data for users and the receiving of user entries. When web
browsers are used as user interfaces, HTML pages prepared in
the presentation layer are accessed by application programs
through the classes and interfaces of the Internet
Connection Framework (ICF), which wrap the HTML pages. The
presentation in a web browser is based on Web Dynpro ABAP
(MVC-based technology for creating platform-independent
web-based interfaces) and also still Business Server Pages
(BSP, HTML pages that incorporate server-side scripts
written directly in ABAP). When you use the SAP GUI that is
available in versions for MS Windows, Java and Web Browser,
user interfaces are displayed in windows that are based on
the (classical) dynpro technology. The layout of a dynpro
can contain a set of predefined screen elements or GUI
controls (wrapped by the classes of a Control Framework, CFW).

Application Layer :
Here, application programs are executed. The application
layer contains a kernel written primarily in C/C++ that
serves as a platform for the application programs. The
kernel of AS ABAP provides Virtual Machines for ABAP with
ABAP Objects (main programming interface of AS ABAP for
business applications), XSLT and ST (transformation
languages for transforming ABAP data to XML and vice versa),
and still JavaScript (obsolete, server-side scripting in
BSPs beside ABAP).

Persistence Layer :
Here, persistent data is held in a database. The database is
accessed by ABAP programs through the database interface of
AS ABAP that is subdivided into an Open SQL interface and a
native SQL interface. Open SQL is a subset of the Structured
Query Language (SQL) realized directly by ABAP statements.
Native SQL are database-specific SQL instructions that are
passed directly to the database system (either statically or
dynamically via ADBC)

Answer / anil chandel

3 tier architecture-
DATABASE LAYER-it is responsible for the maintenance of entrie database. it is logically and physically structured data available in database.

Application layer- it is responsible for business logic. All business logic is maintained at this level...exple-cash should never go negative etc

Presentation layer- it is responsible for user interface and user interaction with the application. it is responsible for images, diagram, chart, table, collection user inputs sending them to application and database layer.

Answer / ramanji436

Presentation layer:- In this layer end user can get input and output .Nothing but user can request and get the output as per his requested date/task.(Using Sapgui,HTTP etc)
Application layer: It receives the request/task from the presentation layer and process the request accordingly(R/3,Netweaver)
Database layer:- This is contain all data about sap data/business data.

Answer / syed mahboob feroz ahmed

Hi,

The Presentation,Application and DataBase Servers in SAP
R/3 represent SAP Architecture and there are 4 types of SAP
R/3 Architecture.
1) SAP/R3 Tier-1 Architecture.
2) SAP/R3 Tier-2 Architecture.
3) SAP/R3 Tier-3 Architecture.
4)SAP/R3 Multi-Tier Architecture.

SAP/R3 Tier1 Architecture is where all the 3 Servers are
present in a Single Server.(Presentation,Application and
DataBase Server).
SAP/R3 Tier2 Architecture is where you
find 2 Servers Presentation and Application Server in One
System and DataBase Server on One System.
SAP/R3 Tier3 Architecture is where you
find 3 Servers Presentation and Application,and DataBase
Server on 3 Different Systems.
SAP/R3 Multi Tier Architecture is where
you find Internet WebServer along with
Presentation,Application and DataBase Server and it is also
Called as SAPWEBAS Application Server.

Whole together it is called as SAP Architecture.

Answer / sanjay

Syed Mahboob Feroz Ahmed

the answer is related to according what is the
architechture and configuration of SAP. But here the
question is diffrent...

Answer / syed mahboob feroz ahmed

Hi Sandy,
I feel like you for your answer this is a online
solution for queries and you dont have any right to say
like that i dont think so you have done your SAP Training
as i am very much comfortable witht he subject and no one
have asked for your sugegstion on this only because of
greedyness bastarad you think you are very smart i would
have you if you are in front of me remember this .

Answer / syed mahboob feroz ahmed

Hi Sanjay,
I agree to your answer related to Presentation,Application
and DataBase Server and the answer you have sent is
Difference between Presentation,Application and DataBase
Server and the question here is not the difference between
Presntation,application and DataBase Server but what are
presentation,Application and DataBase Servers in SAP R/3
Module ,I am highlighting SAP R/3 Module in Terms of SAP
R/3 Module what does Presntation,Application and DataBase
Servers represents and my Solution for this is exactly
Correct.If you do not agree to this you can question me
again.

Answer / thinakar

The presentation server in the netweaver architecture is the
portal server.

In the previous versions, it was the message server that the
sapgui cliets would talk to posting requests to the dispatcher.
ITS came in and enabled the presentation to the web.

IN nw04 stages, the ITS was complemented with nw04 and nw04s.

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