FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 2: Data Models

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 21

True/False

Review LaterAdd Note

Review Later

M:N relationships are not appropriate in a relational model.

A) True
B) False

Correct Answer

verified

Show Answer

Question 22

Multiple Choice

Review LaterAdd Note

Review Later

A(n) _____ represents a particular type of object in the real world.

A) attribute
B) entity
C) relationship
D) node

E) B) and C)
F) All of the above

Correct Answer

verified

Show Answer

Question 23

Short Answer

Review LaterAdd Note

A(n) _____ is a relatively simple representation of more complex real-world data structures.

What do business rules require to be effective?

In Chen notation, entities and relationships have to be oriented horizontally; not vertically.

What components should an implementation-ready data model contain?

From a database point of view, the collection of data becomes meaningful only when it reflects properly defined _____.

A(n) _____ is bidirectional.

The hierarchical model is software-independent.

A(n) _____'s main function is to help one understand the complexities of the real-world environment.

A disadvantage of the relational database management system (RDBMS) is its inability to hide the complexities of the relational model from the user.

In an SQL-based relational database, rows in different tables are related based on common values in common attributes.

A(n) _______ enables a database administrator to describe schema components.

_____ is a language based on OO concepts that describes a set of diagrams and symbols used to graphically model a system.

The movement to find new and better ways to manage large amounts of web- and sensor-generated data and derive business insight from it, while simultaneously providing high performance and scalability at a reasonable cost is referred to as "_____."

A(n) _____ defines the environment in which data can be managed and is used to work with the data in the database.

A(n) _____ is a collection of similar objects with a shared structure and behavior.

Which of the following types of HDFS nodes stores all the metadata about a file system?

A(n) _____ is a restriction placed on the data.

A data model is usually graphical.