By: Prof. Dr. Fazal Rehman | Last updated: September 23, 2024
What is a distributed database?
a) A database that is located on a single server
b) A database that is spread across multiple servers or locations
c) A database that uses distributed transactions
d) A database that is used for online transaction processingAnswer: b) A database that is spread across multiple servers or locations
Which of the following is NOT a characteristic of distributed databases?
a) Data is stored in a single location
b) Data replication across multiple sites
c) Data is accessed and managed as if it were in a single location
d) Data can be fragmented and distributedAnswer: a) Data is stored in a single location
What is data fragmentation in a distributed database?
a) Dividing a large database into smaller parts to enhance performance
b) Breaking data into pieces and storing them in different locations
c) Creating copies of the database at different locations
d) Encrypting data to protect it from unauthorized accessAnswer: b) Breaking data into pieces and storing them in different locations
Which type of data fragmentation involves storing different parts of a database table at different locations based on columns?
a) Horizontal Fragmentation
b) Vertical Fragmentation
c) Mixed Fragmentation
d) ReplicationAnswer: b) Vertical Fragmentation
In a distributed database, what is the primary purpose of data replication?
a) To ensure data consistency
b) To improve data availability and fault tolerance
c) To reduce database size
d) To optimize query performanceAnswer: b) To improve data availability and fault tolerance
Which of the following is an advantage of distributed databases?
a) Increased risk of data inconsistency
b) Complexity in transaction management
c) Improved data availability and reliability
d) Higher costs for maintenanceAnswer: c) Improved data availability and reliability
What is a distributed transaction in the context of distributed databases?
a) A transaction that operates within a single database
b) A transaction that involves multiple databases or sites
c) A transaction that is processed in a single location but replicated across sites
d) A transaction that is split into multiple smaller transactionsAnswer: b) A transaction that involves multiple databases or sites
Which protocol is commonly used for ensuring the atomicity of distributed transactions?
a) Two-Phase Commit (2PC)
b) Three-Phase Commit (3PC)
c) ACID
d) CAP TheoremAnswer: a) Two-Phase Commit (2PC)
What does the CAP Theorem state about distributed systems?
a) A distributed system can achieve consistency, availability, and partition tolerance simultaneously
b) A distributed system can achieve any two of the three properties: consistency, availability, and partition tolerance
c) A distributed system cannot achieve data replication
d) A distributed system can only be consistent or availableAnswer: b) A distributed system can achieve any two of the three properties: consistency, availability, and partition tolerance
In distributed databases, what is ‘transparency’?
a) The ability to hide the complexity of data distribution from users
b) The ability to make data accessible only to authorized users
c) The clarity of data encryption mechanisms
d) The process of maintaining data consistencyAnswer: a) The ability to hide the complexity of data distribution from users
Which of the following is a challenge associated with distributed databases?
a) Single point of failure
b) Uniform data format
c) Simplified transaction management
d) Consistency across multiple sitesAnswer: d) Consistency across multiple sites
What is the purpose of a distributed query processor?
a) To optimize the performance of a single database
b) To manage and coordinate queries across multiple databases
c) To perform data encryption
d) To handle user authenticationAnswer: b) To manage and coordinate queries across multiple databases
Which of the following techniques is used to improve the performance of distributed databases by reducing the amount of data transferred across the network?
a) Data Fragmentation
b) Data Replication
c) Data Encryption
d) IndexingAnswer: a) Data Fragmentation
What is ‘consistency’ in the context of distributed databases?
a) The ability to ensure that all copies of data are identical across different sites
b) The speed at which data is accessed
c) The availability of data during system failure
d) The process of backing up dataAnswer: a) The ability to ensure that all copies of data are identical across different sites
Which distributed database architecture involves centralizing control at a single site while data is distributed across multiple locations?
a) Homogeneous Distributed Database
b) Heterogeneous Distributed Database
c) Client-Server Architecture
d) Peer-to-Peer ArchitectureAnswer: a) Homogeneous Distributed Database
