Explain the importance of data warehouse?


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More Data Warehouse General Interview Questions

If I have table T1 and table T2 T1 has 250 cols and 10,000 rows T2 has 2 billion rows and 10 cols Which one would be Fact table and which one would be Dimension table and why ?

3 Answers   Extech, Principal Finance,


Explain what are snapshots? What are materialized views & where do we use them? What is a materialized view log?

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Explain what are the various transformation available?

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What is metadata in context of a datawarehouse and how it is important?

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Explain what are the modules in power mart?

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What is the difference between power center & power mart?

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What is the difference between star and snowflake schemas?

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What is Time Series algorithm in data mining?

2 Answers  


How can you define a transformation? What are different types of transformations in Informatica?

7 Answers   TCS,


What is difference between Mapplet and reusable transformation?

3 Answers   UST,


What is the main difference between schema in rdbms and schemas in datawarehouse?

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What is a core dimension?

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