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  • Question

  • 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

  • Correct Answer
  • True 

    • Distributed Databases problems

    Search Results

    • 1. 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.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. 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.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The problem of concurrency control is more complex in a distributed database.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The purpose of timestamping is to avoid the use of locks.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A distributed unit of work allows various statements within a unit of work to refer to multiple remote DBMS locations.

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

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

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. 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
      • Discuss
    • 9. The semijoin approach saves network traffic.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. 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
      • Discuss

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