Deck 2: Data Models

Question 1

Business rules apply to businesses and government groups,but not to other types of organizations such as religious groups or research laboratories.

Answer 1

False

Question 2

The relational model is hardware-dependent and software-independent.

Answer 2

False

Question 3

Business rules must be rendered in writing.

Answer 3

True

Question 4

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

Question 5

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

Question 6

Even when a good database blueprint is available,an applications programmer's view of the data should match that of the manager and the end user.

Question 7

An implementation-ready data model needn't necessarily contain enforceable rules to guarantee the integrity of the data.

Question 8

The hierarchical model is software-independent.

Question 9

Within the database environment,a data model represents data structures with the purpose of supporting a specific problem domain.

Question 10

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

Question 11

In an SQL-based relational database,each table is dependent on every other table.

Question 12

The external model is the representation of the database as "seen" by the DBMS.

Question 13

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

Question 14

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

Question 15

Database designers determine the data and information that yield the required understanding of the entire business.

Question 16

The network model has structural level dependence.

Question 17

A data model is usually graphical.

Question 18

In the context of data models,an entity is a person,place,thing,or event about which data will be collected and stored.

Question 19

Today,most relational database products can be classified as object/relational.

Question 20

An implementation-ready data model should contain a description of the data structure that will store the end-user data.

Question 21

A noun in a business rule translates to a(n)in the data model.

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

Question 22

Which of the following is true of business rules?

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 23

The object-oriented data model was developed in the

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

Question 24

A verb associating two nouns in a business rule translates to a(n)in the data model.

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

Question 25

In the model,the basic logical structure is represented as an upside-down tree.

A)hierarchical
B)network
C)relational
D)entity relationship

Question 26

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

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

Question 27

The hierarchical data model was developed in the .

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

Question 28

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

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

Question 29

Oracle 11g is an example of the .

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

Question 30

VMS/VSAM is an example of the .

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

Question 31

In the model,the user perceives the database as a collection of records in 1:M relationships,where each record can have more than one parent.

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

Question 32

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

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

Question 33

are normally expressed in the form of rules.

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

Question 34

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

A)business rules
B)business norms
C)business goals
D)business plans

Question 35

are important because they help to ensure data integrity.

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

Question 36

Students and classes have a relationship.

A)one-to-one
B)one-to-many
C)many-to-one
D)many-to-many

Question 37

A(n)'s main function is to help one understand the complexities of the real­world environment.

A)node
B)entity
C)model
D)database

Question 38

A(n)is the equivalent of a field in a file system.

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

Question 39

In the model,each parent can have many children,but each child has only one parent.

A)hierarchical
B)network
C)relational
D)entity relationship

Question 40

A(n)is bidirectional.

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

Question 41

MySQL is an example of the .

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

Question 42

An internal refers to a specific representation of an internal model,using the database constructs supported by the chosen database.

A)tuple
B)schema
C)object
D)value

Question 43

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

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

Question 44

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

Question 45

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

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

Question 46

NoSQL databases:

A)are geared toward transaction consistency; not performance.
B)support only small amounts of sparse data.
C)are based on the relational model.
D)provide fault tolerance.

Question 47

A(n)in a hierarchical model is the equivalent of a record in a file system.

Question 48

Which of the following is a disadvantage of the hierarchical data model?

A)It does not promote data sharing.
B)It is not efficient with 1:M relationships.
C)It does not promote data integrity.
D)It does not have standards.

Question 49

One of the limitations of the model is that there is a lack of standards.

A)hierarchical
B)network
C)relational
D)entity relationship

Question 50

The data model uses the concept of inheritance.

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

Question 51

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

Question 52

A(n)is the conceptual organization of an entire database as viewed by a database administrator.

Question 53

Which of the following is true of NoSQL databases?
A)They are geared toward transaction consistency rather

A)They do not support distributed database architectures.
B)They are not based on the relational model.
D)They do not support very large amounts of than performance. sparse data.

Question 54

A(n)is a brief,precise,and unambiguous description of a policy,procedure,or principle within a specific organization.

Question 55

The model uses the term connectivity to label the relationship types.

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

Question 56

The relational data model was developed in the .

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

Question 57

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

Question 58

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

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

Question 59

The data model is said to be a semantic data model.

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

Question 60

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

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

Question 61

Each row in the relational table is known as a(n).

Question 62

The relational model's foundation is a mathematical concept known as a .

Question 63

The term is used to refer to the task of creating a conceptual data model that could be implemented in any DBMS.

Question 64

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

Question 65

What do business rules require to be effective?

Question 66

The..is the representation of a database as "seen" by the DBMS.

Question 67

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

Question 68

Each column in a relation represents a(n).

Question 69

What components should an implementation-ready data model contain?

Question 70

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

Question 71

In ,a three­pronged symbol represents the "many" side of the relationship.

Question 72

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

Question 73

What are the sources of business rules,and what is the database designer's role with regard to business rules?

Question 74

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

Question 75

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