Database Normalization Process
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Questions and Answers

What is the main purpose of Normalization?

  • To minimize relationships
  • To organize data in the database (correct)
  • To increase data redundancy
  • To create anomalies

    • Which type of anomaly does Insertion Anomaly refer to?

  • Update Anomaly
  • Inability to Insert Data Anomaly (correct)
  • Data Integrity Anomaly
  • Insertion of Redundant Data Anomaly

    • What does Normalization aim to eliminate?

  • Insertion Anomalies (correct)
  • Data Integrity
  • Relationships
  • Data Security

    • Why is it important to remove anomalies through Normalization?

    <p>To avoid data redundancy and integrity problems</p> Signup and view all the answers

    Which of the following does Normalization NOT help with?

    <p>Increasing update anomalies</p> Signup and view all the answers

    What happens when there is a Deletion Anomaly in a database?

    <p>An unintended loss of some important data occurs</p> Signup and view all the answers

    What is the main characteristic of a relation in 1NF?

    <p>Contains atomic values</p> Signup and view all the answers

    Which normal form requires that all non-key attributes be fully functional dependent on the primary key?

    <p>2NF</p> Signup and view all the answers

    What does BCNF stand for in database normalization?

    <p>Boyce Codd's Normal Form</p> Signup and view all the answers

    Which normal form focuses on the absence of multi-valued dependencies?

    <p>4NF</p> Signup and view all the answers

    What is one of the disadvantages of normalization mentioned in the text?

    <p>Performance degrades with higher normal forms</p> Signup and view all the answers

    What does First Normal Form (1NF) disallow?

    <p>Multi-valued attributes</p> Signup and view all the answers

    In the given context, if there is a transitive dependency for non-prime attributes, what form must the relation be in?

    <p>Third normal form</p> Signup and view all the answers

    What are the conditions that need to be satisfied for a relation to be in third normal form?

    <p>X is a super key, Y is a prime attribute</p> Signup and view all the answers

    In the EMPLOYEE_DETAIL table, which set of attributes forms a candidate key?

    <p>{EMP_ID}</p> Signup and view all the answers

    Why were EMP_CITY and EMP_STATE moved to the EMPLOYEE_ZIP table in the given scenario?

    <p>To avoid transitive dependency</p> Signup and view all the answers

    Which normal form does Boyce Codd normal form (BCNF) relate to in terms of relational database normalization?

    <p>Third normal form</p> Signup and view all the answers

    What makes Boyce Codd normal form (BCNF) stricter than 3NF?

    <p>It enforces functional dependencies more rigorously</p> Signup and view all the answers

    What is a lossless join decomposition in a database?

    <p>A decomposition that preserves all the data without any loss</p> Signup and view all the answers

    What does dependency preservation mean in the context of database decompositions?

    <p>Ensuring that at least one decomposed table satisfies every dependency</p> Signup and view all the answers

    Why is dependency preservation an important constraint in database design?

    <p>It ensures data integrity and consistency</p> Signup and view all the answers

    What term is used to describe the dependency between BIKE_MODEL and MANUF_YEAR?

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

    In a lossless join decomposition, what must be true about the decomposed tables?

    <p>At least one table must satisfy every dependency</p> Signup and view all the answers

    What is the purpose of relational decomposition in the relational model?

    <p>To break tables into multiple tables</p> Signup and view all the answers

    How can dependencies of a relation be preserved in its decomposed tables?

    <p>By distributing dependencies across the tables</p> Signup and view all the answers

    What problem may arise if a relation in the relational model is not in an appropriate normal form?

    <p>Loss of information</p> Signup and view all the answers

    What happens if a decomposition fails to preserve all dependencies of the original relation?

    <p>Data integrity is compromised</p> Signup and view all the answers

    In database design, what issues can decomposition help to eliminate?

    <p>Anomalies, inconsistencies, and redundancy</p> Signup and view all the answers

    How is a lossless decomposition defined in database design?

    <p>When all information is retained during decomposition</p> Signup and view all the answers

    What does a lossless decomposition guarantee in terms of the join of relations?

    <p>Results in the same relation as the original</p> Signup and view all the answers

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