Online 1Z0-006 Practice Test

Question 1

What is the difference between a logical model and a physical model in database design?

Options :

A :

A logical model is created by developers, while a physical model is created by database administrators.

B :

A logical model focuses on performance optimization, while a physical model focuses on data integrity.

C :

A logical model represents the database structure in terms of entities and relationships, while a physical model represents the actual implementation of the database.

D :

A logical model is used for small-scale databases, while a physical model is used for large-scale databases.

Answer: C

Question 2

Which SQL keyword is used to delete data from a table?

Options :

A :

REMOVE

B :

DROP

C :

DELETE

D :

ERASE

Answer: C

Question 3

What is the purpose of denormalization in a physical database model?

Options :

A :

To simplify the database structure and reduce maintenance efforts

B :

To eliminate redundancy and ensure data consistency

C :

To optimize query performance and improve data retrieval speed

D :

To define referential integrity constraints and enforce data integrity

Answer: C

Question 4

Why is it important to normalize entity relationships in a physical data model?

Options :

A :

To improve data query performance

B :

To eliminate data redundancy

C :

To define primary and foreign key constraints

D :

To enforce data type specifications

Answer: B

Question 5

What is the role of database indexes in mapping a physical model?

Options :

A :

To optimize database access and retrieval

B :

To define relationships between tables

C :

To ensure data integrity

D :

To determine the data types for each column

Answer: A

EXPERTY DESIGNED 1Z0-006 PRACTICE TEST