Introduction to Data Warehouse

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Questions and Answers

What does it mean for a data warehouse to be subject-oriented?

It integrates data from various sources
It can be used to analyze multiple subject areas simultaneously
It only contains data related to sales
It focuses on analyzing a specific subject area (correct)

Why is historical data kept in a data warehouse?

To enhance real-time decision making
To reduce storage costs
To support analysis over time (correct)
To retrieve data quickly

What does it mean for a data warehouse to be non-volatile?

Data cannot be altered once it's in the warehouse (correct)
Data is easily modifiable
Data is volatile and prone to loss
Data changes frequently

How does a data warehouse differ from a transaction system in terms of time-variant data?

In a data warehouse, historical data is maintained for analysis over time (D) Signup and view all the answers

Why does a data warehouse integrate data from multiple sources?

To unify different ways of identifying the same entity (B) Signup and view all the answers

What does it mean for a data warehouse to be subject-oriented?

A data warehouse is subject-oriented as it can be used to analyze a particular subject area, such as 'sales'. Signup and view all the answers

Why is historical data kept in a data warehouse?

Historical data is kept in a data warehouse to enable retrieval of data from various time periods, like 3 months, 6 months, or even older data. Signup and view all the answers

What does it mean for a data warehouse to be non-volatile?

A data warehouse is non-volatile as once data is stored in it, it will not change. Signup and view all the answers

How does a data warehouse differ from a transaction system in terms of data retention?

Data warehouses retain historical data for analysis over time, while transaction systems often only hold the most recent data. Signup and view all the answers