Problem 1:
A) Why the top three layers in the reference architecture for distributed database systems are often referred to as site-independent schemas? Define physical image of a global relation at a site.
B) Comment on the different types of dependency for the bottom layers in the reference architecture of DDBMS. Explain the role of local mapping schema towards the integration of heterogeneous multi-site databases in this context.
Problem 2:
A) Differentiate between transaction recovery and crash recovery.
B) Briefly explain the objectives of distributed transaction management.
Problem 3:
A) Write down the responsibilities of transaction manager and transaction coordinator.
B) Define distributed serializability. How is it ensured in a DDBMS?
Problem 4:
A) Compare and contrast Pessimistic and Optimistic Concurrency Control techniques.
B) Describe quorum-based protocol for distributed concurrency control.
Problem 5: Discuss how distributed systems are used in organizations.
Problem 6: Discuss the techniques used to facilitate distributed query processing and Optimization.
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