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Exam 2: Data Models

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Question 21

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

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Question 22

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____ are important because they help to ensure data integrity.

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

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Question 23

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A(n) ____ is bidirectional.

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

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

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

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

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

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

End-user interfaces require the end user to manually generate SQL code.

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

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

The ____________________ defines the portion of the database "seen" by the application programs that produce information from the data.

A(n) ____ enables a database administrator to define schema components.

The hierarchical model is software-independent.

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

A data model is usually graphical.

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

Which data model has the highest level of abstraction?

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