Database Design and Normalization
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Questions and Answers

What is the goal of physical database design?

  • Creating a design for storing data that provides adequate performance and ensures database integrity, security, and recoverability (correct)
  • Minimizing storage space
  • Ensuring data integrity only
  • Improving response time only

    • In the physical design process, what are some of the inputs needed?

  • Logical design diagrams
  • Integrity format and storage estimates (correct)
  • Database normalization rules
  • Data manipulation techniques

    • What is the main purpose of denormalization in database design?

  • Ensuring database security
  • Increasing data redundancy for improved query performance (correct)
  • Reducing redundancy and improving data consistency
  • Optimizing storage space usage

    • When selecting a data type for a field, what is one of the objectives?

    <p>To represent all possible values for the field</p> Signup and view all the answers

    What does the physical database design process lead to?

    <p>File organizations and indexes</p> Signup and view all the answers

    How does field design contribute to database efficiency?

    <p>By controlling data integrity through various techniques</p> Signup and view all the answers

    What is a common reason for denormalization according to Rogers (1989)?

    <p>To increase chance of errors and inconsistencies</p> Signup and view all the answers

    In denormalization, what situation involves two entities with a one-to-one relationship?

    <p>Reference data</p> Signup and view all the answers

    What is a potential downside of denormalization as discussed in the text?

    <p>Force reprogramming when business rules change</p> Signup and view all the answers

    When considering denormalization, what does the text warn about increasing?

    <p>Chance of errors and inconsistencies</p> Signup and view all the answers

    In denormalization, what situation involves a many-to-many relationship with non-key attributes?

    <p>Common denormalization opportunities</p> Signup and view all the answers

    What is an outcome that denormalization may introduce, as mentioned in the text?

    <p>Reintroduce anomalies</p> Signup and view all the answers

    What is the primary benefit of denormalization?

    <p>Speeds up performance by reducing table lookups</p> Signup and view all the answers

    How can denormalization impact the speed of a database system?

    <p>It speeds up performance by reducing the need for multiple table lookups</p> Signup and view all the answers

    In denormalization, what is one common approach to handling missing data?

    <p>Substitute an estimate of the missing value</p> Signup and view all the answers

    What is a key consideration when transforming normalized relations into denormalized physical record specifications?

    <p>Balancing data redundancy and query performance</p> Signup and view all the answers

    Which operation in database design involves transforming normalized relations into non-normalized physical record specifications?

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

    What can denormalization help achieve in terms of data handling?

    <p>Enhanced speed in retrieving data</p> Signup and view all the answers

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