Introduction to Data Warehouse
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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?

    <p>In a data warehouse, historical data is maintained for analysis over time</p> Signup and view all the answers

    Why does a data warehouse integrate data from multiple sources?

    <p>To unify different ways of identifying the same entity</p> Signup and view all the answers

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

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

    Why is historical data kept in a data warehouse?

    <p>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.</p> Signup and view all the answers

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

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

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

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

    Why does a data warehouse integrate data from multiple sources?

    <p>A data warehouse integrates data from multiple sources to provide a unified view with consistent data identifiers.</p> Signup and view all the answers

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