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Database Concepts Review

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Questions and Answers

What is the main purpose of mappings among schema levels in the three-schema architecture?

To eliminate the need for any conversions between data types

To define the structure of user data without worrying about how it is stored internally (correct)

To enforce data integrity constraints across all levels of the architecture

To speed up query performance in the database

Which aspect best describes the difference between a procedural and nonprocedural DML?

The type of users who can access the database using different languages

The ability to directly specify what data is required without specifying how to get it (procedural) vs. specifying both what data is required and how to get it (nonprocedural) (correct)

The level of security provided by the database during transactions

The speed at which queries are executed by the database engine

What is the key difference between logical data independence and physical data independence?

Logical data independence involves user-friendly interfaces, while physical data independence focuses on performance optimization.

Logical data independence allows for more complex queries, while physical data independence simplifies the storage structures.

Logical data independence is focused on security measures, while physical data independence works on backup and recovery strategies.

Logical data independence deals with changes to the conceptual schema without affecting external schemas, while physical data independence deals with changes in the internal schema. (correct)

Why do we need a distinction between database schema and database state?

To understand the difference between current database structure and the data currently stored in it Signup and view all the answers

What is one of the primary reasons for using n-tier architecture over three-tier architecture?

Increased scalability and flexibility in accommodating various application components Signup and view all the answers

Which statement describes the role of a Data Definition Language (DDL) in a database system?

DDL focuses on defining and modifying the structure of the database Signup and view all the answers

In a Web-based system for airline reservations and ticket sales, which DBMS architecture would be the best choice?

Client-Server architecture Signup and view all the answers

In a database schema for an airline reservation system, which column or group of columns must be unique across all rows?

Reservation ID Signup and view all the answers

When designing views for different users of the database, what should be considered?

The level of access each user should have Signup and view all the answers

Which type of constraint dictates that a column or a group of columns must be unique across all rows in a table?

Unique constraint Signup and view all the answers

When designing a database schema, what should additional information and constraints represent?

Business rules and entity relationships Signup and view all the answers

For an airline reservation system, which DBMS architecture would not be a good choice?

Peer-to-Peer architecture Signup and view all the answers