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
Q. In the context of distributed databases, what does the term 'partitioning' refer to?
A.Dividing data into smaller, manageable pieces
B.Combining multiple databases into one
C.Creating backups of the database
D.Encrypting sensitive data
Solution
Partitioning refers to dividing data into smaller, manageable pieces to improve performance and manageability in distributed databases.
Correct Answer: A — Dividing data into smaller, manageable pieces
Q. What is a common challenge in distributed databases?
A.Data normalization
B.Network latency
C.Data encryption
D.User authentication
Solution
Network latency is a common challenge in distributed databases as it can affect the speed and efficiency of data access and transactions.
Correct Answer: B — Network latency
Q. What is a distributed database?
A.A database that is stored on a single server
B.A database that is spread across multiple locations
C.A database that uses cloud storage
D.A database that is only accessible via the internet
Solution
A distributed database is a database that is spread across multiple locations, which can be on different servers or geographical locations.
Correct Answer: B — A database that is spread across multiple locations
Q. What is a federated database system?
A.A single database managed by one server
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 the purpose of indexing in a distributed database?
A.To increase data redundancy
B.To speed up data retrieval
C.To ensure data consistency
D.To manage user permissions
Solution
Indexing in a distributed database is used to speed up data retrieval by creating a data structure that allows for faster searches.
Correct Answer: B — To speed up data retrieval
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 benefit of distributed databases?
A.Increased data redundancy
B.Improved data access speed
C.Simplified database management
D.Reduced data security
Solution
Improved data access speed is a benefit of distributed databases as they can provide faster access to data by locating it closer to the user.
Correct Answer: B — Improved data access speed
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.
Correct Answer: A — Two-phase locking
Q. Which of the following is NOT a type of distributed database architecture?
A.Homogeneous
B.Heterogeneous
C.Centralized
D.Federated
Solution
Centralized is not a type of distributed database architecture; it refers to a database that is managed from a single location.
