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MCQs

Total Questions : 30 | Page 3 of 3 pages
Question 21. The purpose of timestamping is to avoid the use of locks.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 22. Asynchronous technology can result in unsatisfactorily slow response time because the distributed DBMS is spending considerable time checking that an update is accurately and completely propagated across the network.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 23. An increasingly popular option for data distribution as well as for fault tolerance of any database is to store a separate copy of the database at each of two or more sites.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True
Question 24. Databases that are stored on computers at multiple locations and are not interconnected by a network are known as distributed databases.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 25. A distributed unit of work allows various statements within a unit of work to refer to multiple remote DBMS locations.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 26. Data replication is favored where most process requests are read-only and where the data are relatively static.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True
Question 27. The semijoin approach saves network traffic.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 28. In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 29. The problem of concurrency control is more complex in a distributed database.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 30. The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True

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