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Exam 2: Data Models

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Question 21

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

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UML (Unified Modelin...

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Question 22

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

A) extensible markup language (XML)
B) data definition language (DDL)
C) unified modeling language (UML)
D) query language

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Question 23

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

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

A(n) _____ is bidirectional.

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

What components should an implementation-ready data model contain?

The hierarchical model is software-independent.

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 "_____."

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

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

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

A data model is usually graphical.

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

What do business rules require to be effective?

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

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

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

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

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