Distributed Databases problems
- 1. An autonomous homogenous environment is which of the following?
Options- A. The same DBMS is at each node and each DBMS works independently.
- B. The same DBMS is at each node and a central DBMS coordinates database access.
- C. A different DBMS is at each node and each DBMS works independently.
- D. A different DBMS is at each node and a central DBMS coordinates database access. Discuss
Correct Answer: The same DBMS is at each node and each DBMS works independently.
- 2. 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
Correct Answer: All of the above.
- 3. 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
Correct Answer: A single logical database that is spread to multiple locations and is interconnected by a network
- 4. 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- C. The application's data can be somewhat out-of-date.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
Correct Answer: The application's data can be somewhat out-of-date.
- 5. 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
Correct Answer: Each site must have the same storage capacity.
- 6. 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
Correct Answer: The same DBMS is used at each location and data are distributed across all nodes.
- 7. 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 Discuss
Correct Answer: Vertical Partitioning
- 8. 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
Correct Answer: All of the above.
- 9. 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
Correct Answer: Modular growth
- 10. 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
Correct Answer: The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
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