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JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABADMCA V Semester Examinations, February - 2021
DISTRIBUTED DATABASES
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Time: 2 hours
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Max.Marks:75Answer any five questions
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All questions carry equal marks
- - -
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1.
Explain the reference architecture for distributed databases.
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[15]
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2.a)
What is the criteria for checking the correctness of fragmentation? Explain.
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b)
What are integrity constraints? Explain with examples.
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[7+8]
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3.Explain global query optimization using distributed data manager method.
[15]
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4.a)
How fragmented relation simplification is done? Explain.
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b)
Explain about semi-join reduction in distributed databases.
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[8+7]
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5.
Prove that 2-phase locking is a correct distributed concurrency control method. [15]
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6.a)
Explain about log-write-ahead protocol.
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b)
State on the validity of serializability as a correctness criterion.
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[7+8]
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7.a)
Explain quorum-based commitment protocols.
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b)
With examples, explain how to detect inconsistencies in distributed databases.
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[7+8]8.a)
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Write about detection based cache consistency algorithms.b)
Explain attribute-to-entity transformation with an example.
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[8+7]--- Content provided by FirstRanker.com ---
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