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  • Question

  • Replication may use either synchronous or asynchronous distributed database technologies, although asynchronous technologies are more typical in a replicated environment.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • Distributed Databases problems

    Search Results

    • 1. The semijoin approach saves network traffic.

    • Options
    • A. True
    • B. False
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    • 2. With asynchronous technology, if any copy of a data item is updated anywhere on the network, the same update is immediately applied to all other copies or it is aborted.

    • Options
    • A. True
    • B. False
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    • 3. Data replication is favored where most process requests are read-only and where the data are relatively static.

    • Options
    • A. True
    • B. False
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    • 4. With failure transparency, all of the actions of a transaction are committed or none of them are committed.

    • Options
    • A. True
    • B. False
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    • 5. In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex.

    • Options
    • A. True
    • B. False
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    • 7. Each site (or node) in a distributed system is subject to the same types of failure as in a centralized system.

    • Options
    • A. True
    • B. False
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    • 8. If you know all the possible values that an attribute can have, you can enumerate those values in ODL.

    • Options
    • A. True
    • B. False
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    • 9. The ODMG Object Model supports only unary and binary relationships.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Before specifying a key for a class, you must specify its extent.

    • Options
    • A. True
    • B. False
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