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Exam 2: Data Models

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Question 41

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

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verified

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Question 42

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

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UML (Unified Modelin...

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Question 43

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

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

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

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

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

What components should an implementation-ready data model contain?

Each column in a relation represents a(n) .

are normally expressed in the form of rules.

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

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

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

The relational data model was developed in the .

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.