INTRODUCTION TO SAP R/3 ARCHITECTURE AND HANA.

What is sap r/3 architecture?

SAP R/3 is a 3 tier architecture consisting of 3 layers

Presentation

Application

Database

In simple words, it’s a client server architecture.

R signifies Real-time system

3 represents - 3-tier architecture.

User's PC:-  Users can access SAP system in two ways:-

Through SAP GUI

Through Web browser

It's called front-end. Only the front-end is installed in the user's PC not the application/database servers .Front-end takes the user's requests to database server and application servers.

Application Servers: -

 Application server is built to process business-logic. This workload is distributed among multiple application servers. With multiple application servers, the user can get the output more quickly .Application server exists at a remote a location as compared to the location of the user PC.

Database Servers: -

Database server stores and retrieves data as per SQL queries generated by ABAP and Java applications .Database and Application may exist on the same or different physical location.

LAYERS:-

Presentation Layer:

The Presentation Layer contains the software components that make up the SAPgui (graphical user interface). This layer is the interface between the R/3 System and its users.

Application Layer:

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.

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.

SAP HANA AND S/4 HANA.

SAP R3 is the application structure, represents SAPs 3 tier architecture (App , Pres , and DB layers). Each SAP application is a 3 tier where DB is traditional databases like Oracle , DB2 , SQL , MSSQL , Sybase etc… from the last couple of years there is new database is added to this list called “HANA”.

HANA is SAP’s own database and developed for more accuracy and faster in terms of performance more time better than any other database existed due to because of its in-memory concept.

Now HANA is rapidly developing for many upcoming technologies like first and foremost its UI called Fiori and for cloud apps, IOT, Predictive analytics, SDA so many new features were implemented in recent developments of HANA releases….