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Tuesday, August 23, 2016

Top 25 Most Important SAP BW Interview Questions with Answers.


Top 25 Most Important SAP BW Interview Questions with Answers. Latest SAP BW Interview Questions and Answers. Most Frequently Asked SAP BW Interview Questions And Answers.

1) What is SAP BW/BI? What is the purpose of SAP BW/BI?

SAP BW/BI stands for Business Information Warehouse, also known as business intelligence.  For any business, data reporting, analyses and interpretation of business data is very crucial for running business smoothly and making decision.  SAP BW/BI manage the data and enables to react quickly and in line with the market. It enables the user to analyze data from operative SAP applications as well as from other business.

2) In SAP/BI what are the main areas and activities?

a)Data Warehouse: Integrating, collecting and managing entire company’s data.

b)Analyzing and Planning: Using the data stored in data warehouse

c)Reporting: BI provides the tools for reporting in web-browser, excel etc.

d)Broad cast publishing:  To send the information to the employees using email, fax etc.

e)Performance: Performance of the company

f)Security: Securing the access like using SAP logon tickets from portal

3) What is data Integrity?

Data integrity is to eliminate duplicate entries in the database.

4) What is table partition?

Table partition is done to manage the huge data to improve the efficiency of the applications. The partition is based on 0CALMONTH and 0FISCPER. There are two type of partitioning that is done

a)Database partitioning

b)Logical partitioning

5) What is data flow in BW/BI?

Data flows from a transactional system to the analytical system (BW).  DS ( Data Service) on the transactional system needs to be replicated on BW side and attached to infosource and update rules respectively.

6) What is ODS (Operational Data Store)?

‘Operational Data Store’ or ‘ODS’ is used for detailed storage of data. It is a BW architectural component that appears between PSA ( Persistent Staging Area) and infocubes, it allows BEX (Business Explorer) reporting.  It is primarily used for detail reporting rather than dimensional analysis, and it is not based on the star schema. ODS (Operational Data Store) objects do not aggregate data as infocubes do.  To load the data into an IDS object, new records are inserted, existing records are updated, or old records are deleted as specified by RECORDMODE value.

7) What is an ‘Infocube’?

‘Infocube’ is structured as the star schema and it is a data storage area. To create an infocube, you require 1 ‘fact table’ surrounded by 4 dimensions.  The ‘fact table’ is surrounded by different dim table, which are linked with DIM’ ids.  And as per the data, you will have aggregated data in the cubes.

8) How many tables does info cube contain?

Info cubes contain two tables, E table and F (fact table).

9) Mention what are the maximum number of dimensions in info cubes?

In info cubes, there are 16 dimensions ( 3 sap defined and 1 customer defined)

10) What is the difference between ODS and Info-cubes?

The difference between ODS and Info-cubes are

a)ODS has a key while Info-cubes does not have any key
b)ODS contains detailed level data while Info-cube contains refined data
c)Info-cube follows Star Schema (16 dimensions) while ODS is a flat file structure
d)There can be two or more ODS under a cube, so cube can contain combined data or data that is derived from other fields in the ODS

11) What is the dimension in BW? How would you optimize the dimensions?

A dimension in BW is a collection of reference information about a measurable event in data warehousing.  In this context, events are known as “facts”.  For example, a customer dimension’s attributes could include first and last name, gender, birth date etc.  To optimize the dimensions, do not add most dynamic characteristics into the same dimension and make the dimension smaller. Also, define as many dimensions as possible,  and the dimension should not exceed 20% of the fact table size.

12) What are info objects?

Characteristics and key figures will be called as info objects.  ‘Info-objects’ are similar to fields of the source system, data based on which we organize data in different info provider in BW.

13) What is modelling?

Designing of data base is done by using modelling. The design of DB (Data Base) depends on the schema, and schema is defined as the representation of tables and their relationship.

14) What is extended star schema?

Star Schema comprises of Fact tables and Dimension Tables, while the table that consists the Master data are kept in separate tables. These separate tables for Master data are referred as Extended Star Schema.

15) What are the extractors and mention their types?

To extract data from the system program is used which is known as Extractor. The types of extractors in BW are:

a)Application Specific:  BW content FI, HR, CO, SAP CRM, LO cockpit
b)Customer-Generated Extractors:  LIS, FI-SL, CO-PA
c)Cross Application (Generic Extractors) : DB View,Infoset, Function Module

16)   What is a ‘Fact Table’?

Fact table is the collection of facts and relations that mean foreign keys with the dimension.  Actually fact table holds transactional data.

17) What are the data types for the characteristics info object?

There are 4 types


18) What is the use of the process chain?

The use of the process chain is to automate the data load process. It automates the process like Data load, Indices creation, Deletion, Cube compression etc. Process chains are only to load your data’s.

19) What are the transaction codes or T-codes for Info-objects?

The T-codes for Info-Cubes are

a)LISTCUBE: List viewer for InfoCubes
b)LISTSCHEMA: Show InfoCube schema
c)RSDCUBE, RSDCUBED, RSDCUBEM: Start InfoCube editing

20) What is the maximum number of key figures and characteristics?

The maximum number of key figures is 233 and characteristics are 248.

21) How can you convert an info package group into the process chain?

You can convert  package group into a process chain by double clicking on the info package group, then you have to click on the ‘ Process Chain Maint ’ button where you have to type the name and description, this will insert individual info packages automatically.

22) Can an Info-object be an Info-provider?

Yes, info-object can be an info-provider.  In order to do this, you have to right click on the Info Area and select “ Insert characteristics as data target”.

23) What is multi-provider in SAP BI ? What are the features of  Multiproviders?

Multi-provider is a type of info-provider that contains data from a number of info-providers and makes it available for reporting purposes.

a)Multi-provider does not contain any data.
b)The data comes entirely from the info providers on which it is based.
c)The info-providers are connected to one another by union operations.
d)Info-providers and Multi-providers are the objects or views relevant for reporting.
e)A multi-provider allows you to run reports using several info-providers that are, it is used for creating reports for one or more than one info-provider at a time.

24) What is Conversion Routine?

Conversion routine is used to convert data types from internal format to external format or display format.

25) Explain the difference between the Start routine and Conversion routine?

In the ‘start routine’, you can modify the data packages, when data is loading.  While conversion of routine, usually refers to routines bound to info objects for conversion of internal and display format.

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