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- Question
A distributed database can use which of the following strategies?
Options- A. Totally centralized at one location and accessed by many sites
- B. Partially or totally replicated across sites
- C. Partitioned into segments at different sites
- D. All of the above
- Correct Answer
- All of the above
- 1. Which of the following is not one of the stages in the evolution of distributed DBMS?
Options- A. Unit of work
- B. Remote unit of work
- C. Distributed unit of Work
- D. Distributed request Discuss
- 2. Storing a separate copy of the database at multiple locations is which of the following?
Options- A. Data Replication
- B. Horizontal Partitioning
- C. Vertical Partitioning
- D. Horizontal and Vertical Partitioning Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. The keyword "inverse" is used in which of the following?
Options- A. Class
- B. Attribute
- C. Relationship
- D. All of the above. Discuss
- 7. The reserved word enum is used for which of the following?
Options- A. To define a range for an attribute.
- B. To define a range for a class.
- C. To define a range for a relationship.
- D. All of the above. Discuss
- 8. Which of the following is an unordered collection of elements that may contain duplicates?
Options- A. Set
- B. Bag
- C. List
- D. Dictionary Discuss
- 9. A relationship should be specified how in the ODL?
Options- A. One direction starting with the first class
- B. One direction starting with the second class
- C. Neither direction.
- D. Both directions. Discuss
- 10. Which of the following is an ordered collection of elements of the same type?
Options- A. Set
- B. Bag
- C. List
- D. Dictionary Discuss
Distributed Databases problems
Search Results
Correct Answer: Unit of work
Correct Answer: Data Replication
Correct Answer: A different DBMS is used at each location and data are distributed across all nodes.
Correct Answer: Only the joining attributes are sent from one site to another and then only the required rows are returned.
Correct Answer: The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
Correct Answer: Relationship
Correct Answer: To define a range for an attribute.
Correct Answer: Bag
Correct Answer: Both directions.
Correct Answer: List
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