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Home ‣ Database ‣ Object-Oriented Database See What Others Are Saying!
  • Question

  • Which of the following is an unordered collection of elements that may contain duplicates?


  • Options
  • A. Set
  • B. Bag
  • C. List
  • D. Dictionary

  • Correct Answer
  • Bag 

    • More questions

    • 1. Databases that contain historical and summarized information are usually called data warehouses.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Backward recovery is which of the following?

    • Options
    • A. Where the before-images are applied to the database
    • B. Where the after-images are applied to the database
    • C. Where the after-images and before-images are applied to the database
    • D. Switching to an existing copy of the database
      • Discuss
    • 3. Read-only databases are ________ updated.

    • Options
    • A. always
    • B. commonly
    • C. seldom
    • D. never
      • Discuss
    • 4. Applications are programs that interact directly with the database.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The DTD defines the structure of XML documents.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The size of a lock is referred to as lock sizing.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. There are three SQL data modification operations: insert, modify and delete.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Data Mining uses simple arithmetic techniques such as sums, averages, and groupings to perform what-if analyses, to make predictions, and to facilitate decision making.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Which of the following are not done by Business Intelligence (BI) systems?

    • Options
    • A. Analyze past and current activities only
    • B. Process and record transactions only
    • C. Both of the above are correct.
    • D. Neither of the above is correct.
      • Discuss
    • 10. In general, larger block sizes are used for online transaction processing applications and smaller block sizes are used for databases with a decision support or data warehousing system.

    • Options
    • A. True
    • B. False
      • Discuss

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