COPY: Data Modeling Concepts
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COPY: Data Modeling Concepts

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Questions and Answers

What is the primary objective of the Conference on Data Systems Languages (CODASYL) in creating the Database Task Group (DBTG)?

  • To establish database standards (correct)
  • To manipulate database contents
  • To define data structures
  • To improve database performance
  • What is the term for the collection of records in 1:M relationships in the Network Model?

  • Subschema
  • Schema
  • Database
  • Set (correct)
  • What is the purpose of the Data Definition Language (DDL) in the Network Model?

  • To model complex relationships
  • To define schema components (correct)
  • To manipulate database contents
  • To represent data semantics
  • What is the term for the conceptual organization of the entire database as viewed by the database administrator?

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

    What is an advantage of the Network Model?

    <p>Ability to model complex relationships</p> Signup and view all the answers

    What is the relationship between the Owner and Member in the Network Model?

    <p>Parent-Child</p> Signup and view all the answers

    What is the primary focus of physical/low-level data models?

    <p>Describing details of how data is stored in the computer</p> Signup and view all the answers

    What is the purpose of the external schema in the Three-Schema Architecture?

    <p>To describe the various user views</p> Signup and view all the answers

    According to the ANSI/SPARC framework, which level of abstraction describes the structure and constraints for the whole database?

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

    What is the benefit of the Three-Schema Architecture in terms of program-data independence?

    <p>It supports changes to the physical storage without affecting the program</p> Signup and view all the answers

    What is the role of the DBMS in the Three-Schema Architecture?

    <p>To map requests and data among schema levels</p> Signup and view all the answers

    What is the main advantage of using implementation/representational/logical data models?

    <p>They balance user views with some computer storage details</p> Signup and view all the answers

    What is the primary benefit of the declarative nature of SQL language?

    <p>Protection of data from programming errors</p> Signup and view all the answers

    What is the main goal of Big Data management?

    <p>To derive business insights from large amounts of web-generated data</p> Signup and view all the answers

    What is a key characteristic of NoSQL databases?

    <p>Supports distributed database architectures</p> Signup and view all the answers

    What is the term for data with a large number of attributes but a low number of actual instances?

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

    What is the term for the guarantee that updates will eventually propagate through the system?

    <p>Eventual consistency</p> Signup and view all the answers

    What is the main characteristic of a key-value data model?

    <p>Has two main data elements: key and value</p> Signup and view all the answers

    What is the primary focus of database vendors in the 'Internet age'?

    <p>Developing database products that interface efficiently with the Internet</p> Signup and view all the answers

    What is a common characteristic of successful 'Internet age' databases?

    <p>Flexible, efficient, and secure Internet access</p> Signup and view all the answers

    What type of data model provides concepts that are close to how users perceive data?

    <p>Conceptual / high-level / semantic data model</p> Signup and view all the answers

    What is the main benefit of Object-Relational Data Models?

    <p>Provides upward compatibility with existing relational languages</p> Signup and view all the answers

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