NoSQL Databases Overview
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Questions and Answers

What are the main characteristics of NoSQL databases?

  • Dependence on traditional SQL queries
  • High scalability, high availability, and fault tolerance (correct)
  • Limited scalability and availability
  • Strict data consistency and low performance

    • What is a key focus of most NoSQL databases?

  • Performance over transaction consistency (correct)
  • Transaction consistency over performance
  • Data security over performance
  • Schema enforcement over performance

    • Why do distributed databases make copies of data elements at multiple nodes?

  • To ensure high availability and fault tolerance (correct)
  • To increase data consistency
  • To simplify the querying process
  • To reduce the storage cost

    • Which ANSI/SPARC architecture defines three levels of data abstraction?

    <p>External, conceptual, and internal</p> Signup and view all the answers

    What does the external model represent in data modeling?

    <p>End user's view of the data environment</p> Signup and view all the answers

    Which level of data abstraction provides a global view of the entire database?

    <p>Conceptual model</p> Signup and view all the answers

    What is the main purpose of the hierarchical model in data management?

    <p>To manage large amounts of data for complex manufacturing projects</p> Signup and view all the answers

    Which of the following is a key feature of the network database model?

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

    What is the equivalent of a file system's record type in the hierarchical model?

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

    Which model was developed to resolve critical shortcomings of the hierarchical model and improve database performance?

    <p>Network Model</p> Signup and view all the answers

    What does Subschema define in data management?

    <p>The portion of the database viewed by the database administrator</p> Signup and view all the answers

    Which type of relationship is generally used in modern data models according to the text?

    <p>One-to-many (1:M) relationship</p> Signup and view all the answers

    What does 'Velocity' refer to in the context of data processing?

    <p>The need to process data quickly for insights</p> Signup and view all the answers

    Which of the following is a general characteristic of NoSQL databases?

    <p>They provide high scalability and fault tolerance</p> Signup and view all the answers

    What is a key advantage of NoSQL databases with regards to distributed database architecture?

    <p>They generally use a distributed database node</p> Signup and view all the answers

    Why are NoSQL databases considered suited for sparse data?

    <p>Because they support very large amounts of sparse data</p> Signup and view all the answers

    Which of the following is NOT a characteristic of NoSQL databases?

    <p>High transaction consistency</p> Signup and view all the answers

    What role does Velocity play in the context of data processing?

    <p>Processing data quickly for generating information</p> Signup and view all the answers

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