Structured Data Types Quiz
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Structured Data Types Quiz

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Questions and Answers

What is the purpose of the object structure described in the text?

  • To store only basic data types such as integers and strings
  • To represent complex data structures and specific operations defined by the programmer (correct)
  • To enable efficient data retrieval and manipulation
  • To provide a simple and uniform way to represent data

    • What is the purpose of the (i, c, v) representation described in the text?

  • To enable efficient storage and retrieval of object data
  • To provide a way to store complex objects with multiple attributes
  • To represent a tuple of three values, each of which is a different data type
  • To represent a unique object identifier, a type constructor, and the object state (correct)

    • What is the purpose of the 'atom' type constructor described in the text?

  • To represent a single-dimensional array of object identifiers
  • To represent a basic data type such as an integer or string (correct)
  • To represent a set of object identifiers
  • To represent an ordered list of object identifiers

    • What is the purpose of the 'tuple' (or 'struct') type constructor described in the text?

    <p>To represent a structured object with multiple attributes</p> Signup and view all the answers

    What is the purpose of the 'collection' type constructors (e.g., 'set', 'list', 'array', 'bag') described in the text?

    <p>To represent a collection of object identifiers, either ordered or unordered</p> Signup and view all the answers

    What is the difference between an 'array' and a 'list' as described in the text?

    <p>An array is an ordered collection, while a list is an unordered collection</p> Signup and view all the answers

    What are single-valued or atomic types?

    <p>Types that are considered indivisible single values</p> Signup and view all the answers

    What is the purpose of the struct (or tuple) constructor?

    <p>To create standard structured types like tuples or record types</p> Signup and view all the answers

    Which of the following is NOT considered a collection or multivalued type constructor?

    <p>struct(T)</p> Signup and view all the answers

    What is a requirement for the elements in a particular collection value?

    <p>They must be of the same type</p> Signup and view all the answers

    What is the purpose of the atom constructor?

    <p>To represent all basic atomic values like integers and strings</p> Signup and view all the answers

    Which of the following statements is true about type constructors like set(T) and list(T)?

    <p>They are considered to be type generators</p> Signup and view all the answers

    What is one of the key missing features in the relational database concept?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is NOT a characteristic of an Object-Oriented Database Management System (OODMS)?

    <p>Relies solely on the Relational Model</p> Signup and view all the answers

    What does the term 'Object Orientation' refer to?

    <p>A set of design and development principles</p> Signup and view all the answers

    Which of the following is NOT one of the areas where Object Orientation has made contributions?

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

    What does the term 'object identity' refer to in the context of Object-Oriented Database Management Systems?

    <p>The ability to uniquely identify and distinguish objects</p> Signup and view all the answers

    What does an object consist of, according to the text?

    <p>Structure or state (variables) and methods (behavior/operations)</p> Signup and view all the answers

    What does the OODDL define for the Employee and Department classes?

    <p>The type definition and definition of operations</p> Signup and view all the answers

    What is the purpose of the create_emp operation defined for the Employee class?

    <p>To create a new employee object</p> Signup and view all the answers

    What is the purpose of the assign_emp operation defined for the Department class?

    <p>To add a new employee to the department</p> Signup and view all the answers

    What is the purpose of the no_of_emps operation defined for the Department class?

    <p>To retrieve the number of employees in the department</p> Signup and view all the answers

    What is the difference between transient and persistent objects, as mentioned in the text?

    <p>Transient objects exist in the executing program and disappear once the program terminates, while persistent objects are stored in a database and persist after program termination.</p> Signup and view all the answers

    What is the purpose of the naming mechanism mentioned in the text?

    <p>To give an object a unique persistent name through which it can be retrieved by this and other programs in a particular database.</p> Signup and view all the answers

    What is the purpose of a persistent object name?

    <p>It serves as an entry point to the database for users and applications.</p> Signup and view all the answers

    How are most objects in a large database made persistent?

    <p>Through the reachability mechanism.</p> Signup and view all the answers

    What does it mean for an object B to be reachable from an object A?

    <p>A sequence of references in the object graph leads from object A to object B.</p> Signup and view all the answers

    What is the purpose of creating a persistent named object of type DepartmentSet?

    <p>To store a collection of <code>Department</code> objects.</p> Signup and view all the answers

    What is the role of the AllDepartments persistent named object in the example?

    <p>It is an instance of the <code>DepartmentSet</code> class used to store <code>Department</code> objects.</p> Signup and view all the answers

    What is the purpose of the create_dept operation shown in the example?

    <p>It creates a new <code>Department</code> object.</p> Signup and view all the answers

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