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 (C)</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 (A)</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 (C)</p> Signup and view all the answers

What are single-valued or atomic types?

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

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

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

What does the term 'Object Orientation' refer to?

<p>A set of design and development principles (A)</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 (C)</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 (C)</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) (A)</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 (D)</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 (D)</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 (A)</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 (A)</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. (D)</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. (D)</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. (D)</p> Signup and view all the answers

How are most objects in a large database made persistent?

<p>Through the reachability mechanism. (A)</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. (A)</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. (A)</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. (A)</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. (D)</p> Signup and view all the answers

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