Exam 2: Data Models

What do business rules require to be effective?

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

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

A noun in a business rule translates to a(n)in the data model.

In an SQL-based relational database,rows in different tables are related based on common values in common attributes.

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

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

An internal refers to a specific representation of an internal model,using the database constructs supported by the chosen database.

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

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

The external model is the representation of the database as "seen" by the DBMS.

Which of the following types of HDFS nodes stores all the metadata about a file system?

A(n)is a relatively simple representation of more complex real-world data structures.

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

A(n)is a restriction placed on the data.

A(n)is a collection of similar objects with a shared structure and behavior.

The hierarchical model is software-independent.

The network model has structural level dependence.

Business rules apply to businesses and government groups,but not to other types of organizations such as religious groups or research laboratories.

Students and classes have a relationship.