Database - Distributed Databases

Exercise :: Distributed Databases - General Questions

6. 

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

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

Answer: Option C

Explanation:

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7. 

Which of the following is true concerning a global transaction?

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.

Answer: Option B

Explanation:

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8. 

A homogenous distributed database is which of the following?

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.

Answer: Option B

Explanation:

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9. 

Replication should be used when which of the following exist?

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C. The application's data can be somewhat out-of-date.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.

Answer: Option C

Explanation:

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10. 

Storing a separate copy of the database at multiple locations is which of the following?

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

Answer: Option A

Explanation:

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