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What is ERP?

ERP stands for Enterprise Resource Planning.

Enterprise Resource Planning systems integrate all data processes of an Oraganization into unified system.

The key feature of an ERP system is it uses a single or Unified database to store data for the various system modules.

Various Modules which comes under ERP are listed below:

i.Manufacturing
ii.Supply Chain
iii.Financials
iv.CRM
v.Human Resources
vi.Warehouse Management

What is SAP ?

SAP stands for Systems Applicatios and Products in Data Processing.

SAP AG has released SAP R/2 Version initially.The architecture of the R/2 system is Mainframe Architecture.

Later SAP R/3 is released which has different from R/2 architecture.

R stands for RealTime.
3 stands for 3 Tier Architecture.

There are over 120,000 installations at more than 30000 Companies.SAP Products are used over 15 millon People in more than 125 countries.

SAP R/3 Architecture Qns

11. Define service (within R/3)?
A service is a process or group of processes that perform a specific system function and often provide an application-programming interface for other processes to call.

12. What are the roll and page areas?
Roll and page areas are SAP R/3 buffers used to store user contexts (process requests). The SAP dispatcher assigns process requests to work processes as they are queued in the roll and page areas.
Paging area holds data from the application programs.
Roll area holds data from previous dialog steps and data that characterize the user.

13. What are the different layers in R/3 system?
Presentation Layer.
Application Layer.
Database Layer.

14. What are the phases of background processing?
Job Scheduling.
Job Processing.
Job Overview.

15. What components of the R/e system initiate the start of background jobs at the specified time?
The batch scheduler initiates the start of background job. The dispatcher then sends this request to an available background work process for processing.

16. Define Instance.
An instance is an administrative unit in which components of an R/3 systems 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 separate buffer areas.

17. 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.

18. What are R/3 Basis configurations?
A central system with centrally installed presentation software.
Two-level client/server system with rolled out presentation software.
Two-level client/server system. Presentation and Application run on the same computer.
Three-level client/server system. Presentation, Application and database each run on separate computers.

19. What is a Service in SAP terminology?
A service refers to something offered by a s/w component.

20. What is Server in SAP terminology?
A component can consist of one process or a group and is then called the server for the respective service.

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