Exam 2: Data Models

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

A(n) is anything about which data are to 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.

What components should an implementation-ready data model contain?

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

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

Which of the following is true of business rules?

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

are normally expressed in the form of rules.

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

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

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

are important because they help to ensure data integrity.

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

A(n)is bidirectional.

MySQL is an example of the .

Oracle 11g is an example of the .

The object-oriented data model was developed in the

A data model is usually graphical.

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