Distributed databases are a crucial topic in computer science that students must grasp for their exams. Understanding this concept not only enhances your knowledge but also boosts your confidence in tackling related MCQs and objective questions. Practicing these questions helps in identifying important areas and improves your exam preparation, ensuring you score better in your assessments.
What You Will Practise Here
Definition and characteristics of distributed databases
Types of distributed database systems
Advantages and disadvantages of distributed databases
Data distribution and replication techniques
Consistency models in distributed databases
Distributed database management systems (DDBMS)
Real-world applications of distributed databases
Exam Relevance
The topic of distributed databases is frequently included in the syllabus for CBSE, State Boards, NEET, and JEE exams. Students can expect questions that assess their understanding of the key concepts, definitions, and applications of distributed databases. Common question patterns include multiple-choice questions that require students to identify the correct characteristics or advantages of distributed databases, as well as scenario-based questions that test practical knowledge.
Common Mistakes Students Make
Confusing distributed databases with centralized databases
Overlooking the importance of data consistency in distributed systems
Misunderstanding the types of replication techniques
Failing to recognize real-world applications of distributed databases
Neglecting to review the advantages and disadvantages thoroughly
FAQs
Question: What are distributed databases? Answer: Distributed databases are databases that are not stored in a single location but are spread across multiple sites or nodes, allowing for improved performance and reliability.
Question: Why are distributed databases important for exams? Answer: They are a significant part of the computer science curriculum and often appear in various competitive exams, making it essential for students to understand their concepts.
Now is the time to enhance your understanding of distributed databases! Dive into our practice MCQs and test your knowledge to excel in your exams. Remember, consistent practice leads to success!
Q. In a distributed database, what is the purpose of data replication?
A.
To ensure data consistency across all nodes
B.
To reduce the size of the database
C.
To increase the complexity of the system
D.
To eliminate the need for backups
Solution
Data replication in a distributed database ensures data consistency across all nodes by maintaining copies of the same data in multiple locations.
Correct Answer:
A
— To ensure data consistency across all nodes
B.
A collection of autonomous databases that appear as one
C.
A database that only stores metadata
D.
A database that is only accessible through APIs
Solution
A federated database system is a collection of autonomous databases that appear as one, allowing for distributed data access while maintaining individual database autonomy.
Correct Answer:
B
— A collection of autonomous databases that appear as one
Q. What is a major disadvantage of distributed databases?
A.
Increased data availability
B.
Higher complexity in management
C.
Improved performance
D.
Reduced data redundancy
Solution
A major disadvantage of distributed databases is the higher complexity in management due to the need to coordinate multiple nodes and ensure data consistency.
Correct Answer:
B
— Higher complexity in management
Q. What is the main challenge of concurrency control in distributed databases?
A.
Ensuring data is stored in a single location
B.
Managing transactions across multiple nodes
C.
Reducing the size of the database
D.
Simplifying the database schema
Solution
The main challenge of concurrency control in distributed databases is managing transactions across multiple nodes to prevent conflicts and ensure data integrity.
Correct Answer:
B
— Managing transactions across multiple nodes
Q. What is the role of a transaction manager in a distributed database?
A.
To manage data replication
B.
To ensure ACID properties across distributed transactions
C.
To handle user authentication
D.
To optimize query performance
Solution
The transaction manager in a distributed database ensures that ACID properties (Atomicity, Consistency, Isolation, Durability) are maintained across distributed transactions.
Correct Answer:
B
— To ensure ACID properties across distributed transactions
Q. Which of the following is a common method for achieving data consistency in distributed databases?
A.
Two-phase commit protocol
B.
Single-phase commit protocol
C.
Data normalization
D.
Indexing
Solution
The two-phase commit protocol is a common method used to achieve data consistency in distributed databases by ensuring all nodes agree on a transaction before it is committed.
Q. Which of the following is a method for concurrency control in distributed databases?
A.
Two-phase locking
B.
Data sharding
C.
Indexing
D.
Data warehousing
Solution
Two-phase locking is a method for concurrency control in distributed databases that helps prevent conflicts when multiple transactions access the same data.
