Questions and answers for exam Preparation

MCQs

Total Questions : 44 | Page 4 of 5 pages

Question 31. Location transparency allows for which of the following?

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Answer: Option D. -> All of the above.

Question 32. A transaction manager is which of the following?

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Answer: Option D. -> All of the above.

Question 33. A heterogeneous distributed database is which of the following?

The same DBMS is used at each location and data are not distributed across all nodes.
The same DBMS is used at each location and data are distributed across all nodes.
A different DBMS is used at each location and data are not distributed across all nodes.
A different DBMS is used at each location and data are distributed across all nodes.

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Answer: Option D. -> A different DBMS is used at each location and data are distributed across all nodes.

Question 34. Some of the columns of a relation are at different sites is which of the following?

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Answer: Option C. -> Vertical Partitioning

Question 35. Which of the following is true concerning a global transaction?

The required data are at one local site and the distributed DBMS routes requests as necessary.
The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
The required data are at one local site and the distributed DBMS passes the request to only the local DBMS.
The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS.

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Answer: Option B. -> The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.

Question 36. A homogenous distributed database is which of the following?

The same DBMS is used at each location and data are not distributed across all nodes.
The same DBMS is used at each location and data are distributed across all nodes.
A different DBMS is used at each location and data are not distributed across all nodes.
A different DBMS is used at each location and data are distributed across all nodes.

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Answer: Option B. -> The same DBMS is used at each location and data are distributed across all nodes.

Question 37. Replication should be used when which of the following exist?

When transmission speeds and capacity in a network prohibit frequent refreshing of large tables.
When using many nodes with different operating systems and DBMSs and database designs.
The application's data can be somewhat out-of-date.
All of the above.

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Answer: Option C. -> The application's data can be somewhat out-of-date.

Question 38. . A distributed database is which of the following?

A single logical database that is spread to multiple locations and is interconnected by a network
A loose collection of file that is spread to multiple locations and is interconnected by a network
A single logical database that is limited to one location.
A loose collection of file that is limited to one location.

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Answer: Option A. -> A single logical database that is spread to multiple locations and is interconnected by a network

Question 39. . Storing a separate copy of the database at multiple locations is which of the following?

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Answer: Option A. -> Data Replication

Question 40. . A semijoin is which of the following?

Only the joining attributes are sent from one site to another and then all of the rows are returned.
All of the attributes are sent from one site to another and then only the required rows are returned.
Only the joining attributes are sent from one site to another and then only the required rows are returned.
All of the attributes are sent from one site to another and then only the required rows are returned.

Discuss Question

Answer: Option C. -> Only the joining attributes are sent from one site to another and then only the required rows are returned.