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  • Question
  • Some of the columns of a relation are at different sites is which of the following?


  • Options
  • A. Data Replication
  • B. Horizontal Partitioning
  • C. Vertical Partitioning
  • D. Horizontal and Vertical Partitioning

  • Correct Answer
  • Vertical Partitioning 


  • Distributed Databases problems


    Search Results


    • 1. A homogenous distributed database is which of the following?

    • Options
    • A. The same DBMS is used at each location and data are not distributed across all nodes.
    • B. The same DBMS is used at each location and data are distributed across all nodes.
    • C. A different DBMS is used at each location and data are not distributed across all nodes.
    • D. A different DBMS is used at each location and data are distributed across all nodes.
    • Discuss
    • 2. Which of the following is a disadvantage of replication?

    • Options
    • A. Reduced network traffic
    • B. If the database fails at one site, a copy can be located at another site.
    • C. Each site must have the same storage capacity.
    • D. Each transaction may proceed without coordination across the network.
    • Discuss
    • 3. Replication should be used when which of the following exist?

    • Options
    • A. When transmission speeds and capacity in a network prohibit frequent refreshing of large tables.
    • B. When using many nodes with different operating systems and DBMSs and database designs.
    • C. The application's data can be somewhat out-of-date.
    • D. All of the above.
    • Discuss
    • 4. A distributed database is which of the following?

    • Options
    • A. A single logical database that is spread to multiple locations and is interconnected by a network
    • B. A loose collection of file that is spread to multiple locations and is interconnected by a network
    • C. A single logical database that is limited to one location.
    • D. A loose collection of file that is limited to one location.
    • Discuss
    • 5. A transaction manager is which of the following?

    • Options
    • A. Maintains a log of transactions
    • B. Maintains before and after database images
    • C. Maintains appropriate concurrency control
    • D. All of the above.
    • Discuss
    • 6. Location transparency allows for which of the following?

    • Options
    • A. Users to treat the data as if it is at one location
    • B. Programmers to treat the data as if it is at one location
    • C. Managers to treat the data as if it is at one location
    • D. All of the above.
    • Discuss
    • 7. A distributed database has which of the following advantages over a centralized database?

    • Options
    • A. Software cost
    • B. Software complexity
    • C. Slow Response
    • D. Modular growth
    • Discuss
    • 8. Which of the following is true concerning a global transaction?

    • Options
    • A. The required data are at one local site and the distributed DBMS routes requests as necessary.
    • B. The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
    • C. The required data are at one local site and the distributed DBMS passes the request to only the local DBMS.
    • D. The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS.
    • Discuss
    • 9. A semijoin is which of the following?

    • Options
    • A. Only the joining attributes are sent from one site to another and then all of the rows are returned.
    • B. All of the attributes are sent from one site to another and then only the required rows are returned.
    • C. Only the joining attributes are sent from one site to another and then only the required rows are returned.
    • D. All of the attributes are sent from one site to another and then only the required rows are returned.
    • Discuss
    • 10. A heterogeneous distributed database is which of the following?

    • Options
    • A. The same DBMS is used at each location and data are not distributed across all nodes.
    • B. The same DBMS is used at each location and data are distributed across all nodes.
    • C. A different DBMS is used at each location and data are not distributed across all nodes.
    • D. A different DBMS is used at each location and data are distributed across all nodes.
    • Discuss


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