Deck 2: Data Models

Question 1

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

Answer 1

False

Question 2

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

Answer 2

True

Question 3

The network model has structural level dependence.

Answer 3

True

Question 4

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

Question 5

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

Question 6

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

Question 7

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 8

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

Question 9

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

Question 10

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

Question 11

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

Question 12

Business rules must be rendered in writing.

Question 13

The hierarchical model is software-independent.

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

A data model is usually graphical.

Question 20

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

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

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 23

MySQL is an example of the .

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

Question 24

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

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

Question 25

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

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

Question 26

The object-oriented data model was developed in the .

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

Question 27

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

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

Question 28

A(n) is bidirectional.

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

Question 29

VMS/VSAM is an example of the .

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

Question 30

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

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

Question 31

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 32

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 33

The hierarchical data model was developed in the .

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

Question 34

are important because they help to ensure data integrity.

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

Question 35

are normally expressed in the form of rules.

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

Question 36

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

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

Question 37

Students and classes have a relationship.

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

Question 38

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 39

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

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

Question 40

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 41

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 42

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 43

The data model uses the concept of inheritance.

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

Question 44

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

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

Question 45

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

Question 46

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

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

Question 47

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

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

Question 48

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 49

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

Question 50

The relational data model was developed in the .

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

Question 51

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 52

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 53

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 54

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

Question 55

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 56

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 57

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 58

Which of the following is True of NoSQL databases?
A) They do not support distributed database architectures.
B) They are not based on the relational model.

A) They are geared toward transaction consistency rather
D) They do not support very large amounts of than performance. sparse data.

Question 59

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

Question 60

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

Question 61

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

Question 62

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

Question 63

In , a three-pronged symbol represents the "many" side of the relationship.

Question 64

Describe the three parts involved in any SQL-based relational database application.

Question 65

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

Question 66

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

Question 67

What do business rules require to be effective?

Question 68

Each column in a relation represents a(n) .

Question 69

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

Question 70

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

Question 71

What components should an implementation-ready data model contain?

Question 72

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

Question 73

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

Question 74

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

Question 75

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