INTERVIEW QUESTION ON SAP ABAP R/3 ARCHITECTURE-2

What is the meaning of "R" in R/3 systems?

R/3 stands for real-time three tier architecture. R/3 means three layers are installed in Different System/server and they are connected with each other.

Which interface controls what is shown on the PC?

Presentation Interface.

For which tasks is the database interface responsible?

1.       Conversion of Open SQL statement from ABAP statements into the corresponding database statements.

      2. Database independence of application programs.

      3. Usage of the SAP buffers.

What are presentation and application servers in SAP?

Presentation server is actually a program named SAPGUI.exe. It is usually installed on a user’s Workstation. Application server is a set of executables that collectively interpret the ABAP/4 programs and manage the input & output for them.

Where does an ABAP program get stored after save?

SAP program is stored in Application server and SAP kernel.

Who take care of data while passing to Application server?

Database interpreter.

What guarantees the integration of all application modules?

The R/3 basis system guarantees the integration of all application modules. The R/3 basis software provides the run time Environment for the R/3 applications, ensures optimal integration, defines a stable architectural frame for system Enhancements, and contains the administration tools for the entire system. One of the main tasks of the Basis system is to guarantee the portability of the complete system.

What is a Server & Client in SAP terminology?

Server: A component can consist of one process or a group of processes and is then called the server for the respective Service.

Client: A software component that uses the service (offered by a software component) is called a client. At the same time these clients may also be servers for other services.

A single R/3 system can manage the application data for several separate areas of business. Each of these commercially separate areas in the R/3 system is called a client. Every client has a unique number, and when a user Logon to R/3 System they specify that client number. Both client and server is self-contained organization unit in the system.

What are R/3 Basis configurations?

1. A central system with centrally installed presentation software.

2. Two-level client/server system with rolled out presentation software.

3. two-level client/server system. Presentation and Application run on the same computer.

4. three-level client server system. Presentation, application and database each run on separate computers.

5. from hardware perspective, every information system can be divided into three task areas

Presentation, Application Logic and Data storage. The R/3 Basis software is highly suitable for use in multi-level client/server architectures.

What is a SAP System?

The union of all software components that are assigned to the same database is called as a SAP system.

Does SAP handle multiple currencies?

Yes.

SAP system configuration includes _______ tasks and ________ tasks.

Dialog, Update.

Define Instance.

An instance is an administrative unit in which components of an R/3 system providing one or more services are grouped together. The services offered by an instance are started and stopped at random. All components are parameterized using a joint instance profile. A central R/3 system consists of a single instance in which all necessary SAP services are offered. Each instance uses a separate buffer areas.

Which SAP GUI types are there?

SAP GUI for Windows.

SAP GUI for HTML.

SAP GUI for Java.

Explain how SAP GUI handles output screen for the user.

The SAP front-end software can either run on the same computer or on different computers provided for that purpose. User terminal input is accepted by the SAP terminal program SAP GUI, converted to SAP proprietary format and sent to the SAP dispatcher. The dispatcher co-ordinates the information exchange between the SAP GUIs and the work processes. The dispatcher first places the processing request in request queues which it then processes. The dispatcher dispatches the requests one after another, to the available work process. The actual processing takes place in the work process. When processing is complete, the result of a work process is returned via the dispatcher to the SAP GUI. The SAP GUI interprets the received data and generates the output screen for the user.

What is SAP dispatcher?

SAP dispatcher is the control agent which manages the resources for the R/3 applications.

What are the functions of dispatcher?

Functions of dispatcher are:

1. Equal distribution of transaction load to the work process.

2. Management of buffer areas in main memory.

3. Integration of the presentation levels.

4. Organization of communication activities.

Which component of an application server controls the data traffic between work process and presentation server?

Dispatcher.

What is a work process?

A work process is where individual dialog steps are actually processed and the work is done. Each work process handles one type of request. Dialog work processes perform only one dialog step and then available for the next request.