Question 1

are important because they help to ensure data integrity.

Accepted Answer

A)  Attributes
B)  Entities
C)  Relationships
D)  Constraints

Question 2

The model is the end users' view of the data environment.

Accepted Answer

A)  abstract
B)  external
C)  conceptual
D)  internal B

Question 3

The object-oriented data model was developed in the

Accepted Answer

A)  1960s
B)  1970s
C)  1980s
D)  1990s

Question 4

What components should an implementation-ready data model contain?

Accepted Answer

An implementation-ready data model shoul...

Question 5

A data model is usually graphical.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

UML (Unified Modeling Language)Unified Modeling Language (UML)Unified Modeling Language UML

Question 7

Which of the following types of HDFS nodes acts as the interface between the user application and the HDFS?

Accepted Answer

A)  Data node
B)  Client node
C)  Name node
D)  Map node

Question 8

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

Accepted Answer

data manip...

Question 9

Each row in the relational table is known as an entity instance or entity occurrence in the ER model.

Accepted Answer

A) True 
 B)False

Question 10

Each row in a relation is called a(n).

Accepted Answer

The answer of Each row in a relation is called...

Question 11

The model was developed to allow designers to use a graphical tool to examine structures rather than describing them with text.

Accepted Answer

A)  hierarchical
B)  network
C)  object-oriented
D)  entity relationship

Question 12

Which of the following is true of business rules?

Accepted Answer

A)  They allow the designer to set company policies with regard to data.
B)  They allow the designer to develop business processes.
C)  They can serve as a communication tool between the users and designers.
D)  They provide a framework for the company's self-actualization.

Question 13

A(n) is bidirectional.

Accepted Answer

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

Question 14

A(n)  is anything about which data are to be collected and stored.

Accepted Answer

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

Question 15

are normally expressed in the form of rules.

Accepted Answer

A)  Attributes
B)  Entities
C)  Relationships
D)  Constraints

Question 16

In object­oriented terms,a(n)defines an object's behavior.

Accepted Answer

The answer of In object­oriented terms,a(n)defines an object's behavior....

Question 17

Oracle 11g is an example of the .

Accepted Answer

A)  hierarchical model
B)  file system data model
C)  relational data model
D)  XML/Hybrid data model

Question 18

Describe the conceptual model and its advantages.What is the most widely used conceptual model?

Accepted Answer

The conceptual model represents a global...

Question 19

MySQL is an example of the .

Accepted Answer

A)  hierarchical model
B)  file system data model
C)  relational data model
D)  XML data model

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 2: Data Models

are important because they help to ensure data integrity.

Correct AnswerverifiedShow Answer

The model is the end users' view of the data environment.

Correct AnswerverifiedB

The object-oriented data model was developed in the

Correct AnswerverifiedShow Answer

What components should an implementation-ready data model contain?

Correct AnswerverifiedAn implementation-ready data model shoul...View AnswerShow Answer

A data model is usually graphical.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedUML (Unified Modeling Language)Unified Modeling Language (UML)Unified Modeling Language UML

Which of the following types of HDFS nodes acts as the interface between the user application and the HDFS?

Correct AnswerverifiedShow Answer

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

Correct Answerverifieddata manip...View AnswerShow Answer

Each row in the relational table is known as an entity instance or entity occurrence in the ER model.

Correct AnswerverifiedShow Answer

Each row in a relation is called a(n).

Correct AnswerverifiedShow Answer

The model was developed to allow designers to use a graphical tool to examine structures rather than describing them with text.

Correct AnswerverifiedShow Answer

Which of the following is true of business rules?

Correct AnswerverifiedShow Answer

A(n) is bidirectional.

Correct AnswerverifiedShow Answer

A(n) is anything about which data are to be collected and stored.

Correct AnswerverifiedB

are normally expressed in the form of rules.

Correct AnswerverifiedShow Answer

In object­oriented terms,a(n)defines an object's behavior.

Correct AnswerverifiedShow Answer

Oracle 11g is an example of the .

Correct AnswerverifiedShow Answer

Describe the conceptual model and its advantages.What is the most widely used conceptual model?

Correct AnswerverifiedThe conceptual model represents a global...View AnswerShow Answer

MySQL is an example of the .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
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B

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An implementation-ready data model shoul...
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UML (Unified Modeling Language)Unified Modeling Language (UML)Unified Modeling Language UML

Correct Answer
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data manip...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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B

Correct Answer
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In objectoriented terms,a(n)defines an object's behavior.

Correct Answer
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Correct Answer
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Correct Answer
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The conceptual model represents a global...
View Answer

Correct Answer
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Correct Answer
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