Exam 2: Data Models

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

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

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

are normally expressed in the form of rules.

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.

What components should an implementation-ready data model contain?

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

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

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

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

Each column in a relation represents a(n) .

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

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

The relational data model was developed in the .

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