What is a common purpose of integrity validation in database design?

What is a common purpose of integrity validation in database design?

• A. To ensure user access control
• B. To confirm consistent data relationships
• C. To optimize query performance
• D. To track version changes

Answer: (B)

The common purpose of integrity validation in database design is to confirm consistent data relationships. This involves ensuring that the data adheres to defined rules and constraints, which are critical for maintaining data quality and accuracy within the database.

Data integrity comes in various forms, such as entity integrity, which requires that each table has a unique primary key, and referential integrity, which ensures that relationships between tables remain consistent. For example, if a foreign key in one table references a primary key in another, integrity validation ensures that there are no orphaned records—meaning that every foreign key value points to a valid entry in the corresponding primary key table.

While ensuring user access control is important for security, it is more relevant to authentication and authorization than to data integrity itself. Optimizing query performance focuses on efficiency in data retrieval, which is separate from maintaining the correctness of relationships between data elements. Tracking version changes pertains to managing and recording alterations in data over time, which serves a different purpose than maintaining data integrity constraints.