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Exam 2: Data Models

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Question 1

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

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verified

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Question 2

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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

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

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C

Question 3

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

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

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

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

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.

The network model has structural level dependence.

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

The relational model's foundation is a mathematical concept known as a(n) _____.

The hierarchical data model was developed in the _____.

_____ are normally expressed in the form of rules.

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

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

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

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

The relational data model was developed in the _____.

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

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

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