16 Questions
What is the primary purpose of data replication in a distributed database system?
To remove single points of failure and improve system availability
How does data replication contribute to performance improvement in distributed databases?
By localizing most of the access, which reduces response time
What is one of the challenges posed by data replication in distributed database systems?
Keeping different copies synchronized
What is the execution model for replicated data items in a distributed database system?
Each data item has multiple physical copies but only one logical copy
What is the purpose of having multiple copies of data items as part of their operational specifications?
To meet application requirements dictated by the applications
What are the key benefits of data replication in a distributed database system?
Improving system availability, performance, and scalability
In a replicated database, what is the responsibility of the replica control protocol?
Mapping read and write operations to logical data items
What does one-copy equivalence (single system image) refer to in a replicated database?
Treating the system as if there is a single copy of each data item
What characterizes a partially replicated database?
Some data items may be non-replicated and the number of physical data items for each logical data item may vary
What does strong consistency criteria ensure in a replicated database?
All replicas of each data item have identical values
In a replicated database, what characterizes centralized update techniques?
Performing updates first on a master copy
What is the responsibility of the update propagation decision in a replicated database?
Deciding how updates are distributed among replicas
What is the impact of a mutually consistent state in a replicated database?
All replicas of each data item have identical values
What types of transactions are considered global in a partially replicated database?
Transactions accessing only non-replicated data items
What does the degree of replication transparency refer to in a replicated database?
Translating logical operations to operate on physical objects
What are the techniques characterized as distributed update techniques in a replicated database?
Allowing updates over any replica
Test your knowledge of distributed database systems with this quiz covering topics such as introduction to distributed database, design, query processing, optimization, transaction processing, concurrency control, reliability, data replication, big data processing, and web data management.
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