User:Vdcbose

SAP Basic Questions

1. When SAP is founded?

Ans: SAP was founded in 1972 in Walldorf, Germany

2. What is SAP ?

Ans: System Applications & Products for/in Data Processing. SAP is an ERP product. ERP - Enterprised Resource Planning. ERP is an Integrated software solution for a company.

3. Why SAP ?

Ans: It has competitive advantage over to other ERP products. Today SAP focussed on        SMB( Small Business) also. Advantages of SAP : DB Independent OS Independent Multilingual User Friendly Environment [ Font sizes, colors, set your own favourites ] Rich set of modules (SD, MM, PS, HR) ADD ON's : Industry Specific Components Support X platform (XI) : To Communicate with legacy systems Continuous Improvement : R/3( 2.0,3.0, 3.1, 4.0, 4.5, 4.6, 4.7, 5.6, 5.7) Web Enabled User Interfaces: Which is Enterprised Portal means user can logon to SAP system through Web Browser ( say IE ) any where. Mobile Infrastructure [ SMS, Paging, PDA ] Security: a. It is provided by SAP in a network through Encryption or Decryption & by                     Digital Signatures. b. SAP provides field level security. c. SAP provides security in two ways: I. Internal Security: * Security built on application. * Parameters are defined to control access. II. External Security: * SAP Router * Firewall * DMZ Support email & fax Provides Releability & Integration Scalable : You can upgrade from lower version to higher version It provides greater Performance You can Customize the SAP product according to the company requirements. SAP is Highly Available. SAP & Non SAP can Communicate : This is supported by a technology called ALE,EDI,IDOC. Currently : Exchange Infrastructure(XI) 3.0.

4. Difference between Authentication & Authorization ?

Ans: Authentication : Means Checking Username & Password. Authorization  : Means Checking Accessive Permissions of an User. 5. What is BASIS ?

Ans: a. Who supports an SAP Environment. b. It is a Platform for SAP Applications. c. BASIS stands for Bussiness Application Software Integrated Soluition.

6. What is High Availability ?

Ans: High Availability means the system should not down. For that we have to protect Operating System & Log Files.

7. What is the Difference between SAN & NAS ?

Ans: SAN:a. SAN stands for Storage Area Network b. SAN is through Fiber Channel. c. More Advantage becoz of dedicated channel. NAS:a. NAS stands for Network Area Storatge. b. NAS is through LAN. c. Less Advantage when compared to SAN.

8. What is RAID? Types of RAID ? and Discuss about Clustering concept ?

Ans: RAID : Redundant Array of Inexpensive Disks.

9. What is Memory Leak ? How to Find it ? Give Suggestion to overcome a failure at a    particular time ?

Ans: a. Memork Leak means it works partially. And the performance will be down. b. Using tools we can find the memory leak is exists or not c. When you are buying a 1 memory stick buy 4 sticks to overcome a failure at            a particular time. If one fails other will works. 256MB *  4 = 1GB (Recommended) 10. Give one example why you need more RAM?

Ans:

Suppose if you have 1 GB memory stick & 128 MB Graphics ( Dedicated memory for Graphics). If graphics needs more memory then it directly takes from Main Memory.

11. Why Dual CPU's are recommended ?

Ans: For Load Balancing(only sharing not mirroring) & Failover

12. What Process Agent Thread will do?

Ans: When Number of users increases we need more number of process which is allocated by Process Agent Thread.

13. Who designs CPU ? and What is SAPS?

Ans: CPU is designed by vendor. We have to ask vendor how many SAPS, the CPU will generate. SAPS : a. SAPS is the unit to measure CPU. b. SAPS(SAP Application benchmark for Performance Standards). We can go for multiple CPU's when dual CPU is not supported. 14. Difference between Mirroring and RAID ?

Ans: Mirroring: a. Mirroring is not Hotswap. b. For 10 disks, we need 10 disks for mirroring. c. Mirroring is used for O.S and for Log Files. d. In Mirroring I/O contentions are more. RAID: a. RAID is Hotswap. b. For 10 disks, we need 10 + 1 disks(i.e., n+1). c. RAID is used for Database. d. In RAID, we span the data the I/O contentions are less compared to Mirroring.

15. Discuss about Server Down Times ?

Ans: The server can be down in two types. a. Planned Down Time and  b.  Unplanned Down Time

16. Discuss about Unplanned Down Time ?

Ans: Unplanned down time occurs when building collapse, then to provide High Availablity to users when Unplanned down time occurs we setup DR Servers( Disaster Recovery Servers). By using DR servers we will recover the data at the point where failure occurs.

17. Disadvantages of Client/Server Architeture or 2- Tier Architecture ?

Ans: a. Load on the server b. High Response Times. c. Database is Heavily Loaded d. Network Congestion (Wait Time Increases). e. Buffers are not Managed Effectively

18. Why Intermediate Layer is required in Client/Server Architecture ? What is it ?

Ans: In Client/Server Architecture, a. Load on the server b. High Response Times. c. Database is Heavily Loaded d. Network Congestion (Wait Time Increases). e. Buffers are not Managed Effectively So, the Intermediate layer is added which is Application Server. Application Server is an Agent or Catalyst for Client/Server Architeture.

19. How many users Application Server supports ? Can we increase Application Servers ? If we can increase Application Servers increases how the are updated?

Ans: a. Each Application Server can be go upto 300 to 500 users. b. We can increase the Application Servers depending upon the load. c. Application Servers are updated using " Buffer Synchronization " concept.