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MCQs

Total Questions : 44 | Page 2 of 5 pages
Question 11. A distributed database is which of the following?
  1.    A single logical database that is spread to multiple locations and is interconnected by a network
  2.    A loose collection of file that is spread to multiple locations and is interconnected by a network
  3.    A single logical database that is limited to one location.
  4.    A loose collection of file that is limited to one location.
 Discuss Question
Answer: Option A. -> A single logical database that is spread to multiple locations and is interconnected by a network
Question 12. A semijoin is which of the following?
  1.    Only the joining attributes are sent from one site to another and then all of the rows are returned.
  2.    All of the attributes are sent from one site to another and then only the required rows are returned.
  3.    Only the joining attributes are sent from one site to another and then only the required rows are returned.
  4.    All of the attributes are sent from one site to another and then only the required rows are returned.
 Discuss Question
Answer: Option C. -> Only the joining attributes are sent from one site to another and then only the required rows are returned.
Question 13. Which of the following is a disadvantage of replication?
  1.    Reduced network traffic
  2.    If the database fails at one site, a copy can be located at another site.
  3.    Each site must have the same storage capacity.
  4.    Each transaction may proceed without coordination across the network.
 Discuss Question
Answer: Option C. -> Each site must have the same storage capacity.
Question 14. A distributed database can use which of the following strategies?
  1.    Totally centralized at one location and accessed by many sites
  2.    Partially or totally replicated across sites
  3.    Partitioned into segments at different sites
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 15. Which of the following is not one of the stages in the evolution of distributed DBMS?
  1.    Unit of work
  2.    Remote unit of work
  3.    Distributed unit of Work
  4.    Distributed request
 Discuss Question
Answer: Option A. -> Unit of work
Question 16. With failure transparency, all of the actions of a transaction are committed or none of them are committed.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 17. Each site (or node) in a distributed system is subject to the same types of failure as in a centralized system.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 18. Synchronization for pull replication is less disruptive and occurs only when needed by each site, not when a central master site thinks it is best to update.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 19. 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 20. 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.    True
  2.    False
 Discuss Question
Answer: Option B. -> False

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