Denormalization MCQs in DBMS

By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 23, 2024

1. What is denormalization in the context of databases?

a) The process of organizing data to reduce redundancy
b) The process of combining normalized tables to improve performance
c) The process of eliminating transitive dependencies
d) The process of converting data into a standard format

Answer: b) The process of combining normalized tables to improve performance

2. What is the primary advantage of denormalization?

a) Reduced storage requirements
b) Increased data redundancy
c) Improved data retrieval speed
d) Simplified data maintenance

Answer: c) Improved data retrieval speed

3. Which of the following is a potential disadvantage of denormalization?

a) Increased complexity in query design
b) Reduced data redundancy
c) Increased risk of data anomalies
d) Enhanced data integrity

Answer: c) Increased risk of data anomalies

4. In which scenario is denormalization typically considered?

a) When data redundancy needs to be minimized
b) When query performance is a critical concern
c) When data consistency is more important than speed
d) When a database is in its early design phase

Answer: b) When query performance is a critical concern

5. Which of the following issues can denormalization introduce into a database system?

a) Improved data consistency
b) More efficient storage usage
c) Update and insert anomalies
d) Simplified data schema

Answer: c) Update and insert anomalies

6. How does denormalization affect data redundancy in a database?

a) It decreases data redundancy
b) It eliminates data redundancy
c) It has no impact on data redundancy
d) It increases data redundancy

Answer: d) It increases data redundancy

7. What is a common reason for denormalizing a database?

a) To simplify database design
b) To reduce the need for complex joins in queries
c) To ensure the database conforms to a standard
d) To minimize data duplication

Answer: b) To reduce the need for complex joins in queries

8. When denormalizing a database, what is a typical approach to manage increased data redundancy?

a) Introducing more foreign keys
b) Implementing triggers to maintain data consistency
c) Using more indexes
d) Reducing the number of tables

Answer: b) Implementing triggers to maintain data consistency

9. Denormalization can lead to which of the following types of anomalies?

a) Functional dependency anomalies
b) Multivalued dependency anomalies
c) Insertion, update, and deletion anomalies
d) Normalization anomalies

Answer: c) Insertion, update, and deletion anomalies

10. What is the trade-off involved in denormalization?

a) Increased data redundancy for faster data retrieval
b) Improved data integrity for slower query performance
c) Decreased data redundancy for simpler database maintenance
d) Greater storage efficiency for reduced data consistency

Answer: a) Increased data redundancy for faster data retrieval

 

More MCQs Of Database Systems

1. Database Models MCQs in DBMS
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   2. Network model MCQs in DBMS
   3. Relational model MCQs in DBMS
   4. Object-oriented model MCQs in DBMS
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2. Relational Database Model MCQs in DBMS
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   3. Integrity constraints MCQs in DBMS
3. SQL (Structured Query Language) MCQs in DBMS
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   3. Data Control Language (DCL) MCQs in DBMS
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   2. File organization and access methods MCQs
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8. Database Transaction Management MCQs in DBMS
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