Database System Concepts and Architecture Quiz

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16 Questions

What does a data model consist of?

Elements, data types, and relationships among groups

What are constraints in a data model used for?

Enforcing restrictions on valid data

Which term is used to describe basic model operations like insert, delete, and update?

User-defined operations

What is the purpose of constructs in a data model?

Defining the database structure

What do operations on the data model include?

Specifying database retrievals and updates

Which term is used to describe the set of concepts used to describe the structure of a database?

Data Models

What is the database schema?

The description of a database, including descriptions of the database structure, data types, and constraints

What does the term 'instance' refer to in the context of a database?

The actual content (data) stored in a database at a particular moment in time

What is the distinction between the database schema and the database state?

Database schema changes very infrequently (Schema evolution), whereas the database state changes every time the database is updated

What is the goal of the three-schema architecture in a DBMS?

To support program-data independence and multiple views of the data

What is an empty database state?

Refers to the database state when it is initially loaded with the initial data into the system

What does a schema diagram illustrate?

An illustrative display of (most aspects of) a database schema

What does 'instance' refer to in individual database components?

(Occurrence /Snapshot)

What is a valid state in the context of a database?

A state that satisfies the constraints of the database

What changes every time the database is updated?

The actual content (data) stored in a database at a particular moment in time

What does an initial database state refer to?

Refers to the database state when it is initially loaded with the initial data into the system

Test your knowledge of data models, schemas, database architecture, and DBMS languages with this quiz. Explore concepts such as data independence and the three-schema architecture.

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