Data Warehouse General Interview Questions
Questions Answers Views Company eMail

What is the difference between OLAP, ROLAP, MOLAP and HOLAP?

2 41993

What is the difference between an ODS and a W/H?

Barclays,

1 12441

What Oracle tools can be used to design and build a W/H?

1 4267

When should one use an MD-database (multi-dimensional database) and not a relational one?

IBM,

2 7722

What is a star schema? Why does one design this way?

3 13871

When should you use a STAR and when a SNOW-FLAKE schema?

Accenture,

6 47616

What is the difference between Oracle Express and Oracle Discoverer?

1 6227

How can Oracle Materialized Views be used to speed up data warehouse queries?

3 11773

What Oracle features can be used to optimize my Warehouse system?

1 4908

Where can one get more info about Data Warehousing?

TCS,

3 9348

what is the difference between aggregate table and fact table ? how do you load these two tables ?

Target,

12 49563

suppose data are coming from different locations and those data will not change . is there any need to use surrogate key ?

Oracle,

3 8742

how can one connect two fact tables ? is it possible ? how?

ABC, Oracle, Patni,

8 34672

Difference between ODS and Staging

HeadStrong, TCS,

4 38613

wht is degenerated dimension ?it's uses?

CTS, Infosys,

10 48807


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Un-Answered Questions { Data Warehouse General }

Explain what are the methodologies of data warehousing?

525


In a star schema, are foreign key constraints between facts and dimensions neccessary?

532


What is the 4 + 1 view model as it relates to system modeling?

586


How to pivot row data using informatica?

504


hi i have 2 users and 4 reports in dashboard.i have to give rights 2 reports for every users. is it possible give the rights in dashboard.if yes plz let me know how is it possible . thanks in advacne for appreciation. bye rohit

1634






What are partition points?

555


Suppose we want to display zero when null values coming to report how can we do that?

520


Explain why denormalization is promoted in universe designing?

541


What are the approaches used by optimizer during execution plan?

474


How to limit the max no of rows retrieved in the report?

542


What is the purpose of cluster analysis in data warehousing?

554


How to add a number to a macro variable?

543


Explain difference between snow flake and star schema. What are situations where snow flake schema is better than star schema to use and when the opposite is true?

488


What are the other names given to data warehousing?

632


In my report contain product name, amount, country, sales person I want to create one prompt: sales territory.( Ex: asia, us, uk, aus), but territory column is not there in my model and source if u select the asia in prompt page-ll asian country results I want in report page I discussed with my friends and colleague, they told use the static choice function still I face this problem. If u know please tell me?

590