A distributed database is which of the following? A single logical database that

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Question
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.

Correct Answer

A single logical database that is spread to multiple locations and is interconnected by a network

Distributed Databases problems

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1. 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.

2. 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.

3. A multifield transformation does which of the following?
Options
A. Converts data from one field into multiple fields
B. Converts data from multiple fields into one field
C. Converts data from multiple fields into multiple fields
D. All of the above

4. The load and index is which of the following?
Options
A. A process to reject data from the data warehouse and to create the necessary indexes
B. A process to load the data in the data warehouse and to create the necessary indexes
C. A process to upgrade the quality of data after it is moved into a data warehouse
D. A process to upgrade the quality of data before it is moved into a data warehouse

5. Reconciled data is which of the following?
Options
A. Data stored in the various operational systems throughout the organization.
B. Current data intended to be the single source for all decision support systems.
C. Data stored in one operational system in the organization.
D. Data that has been selected and formatted for end-user support applications.

6. 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.

7. 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.

8. 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.

9. 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

10. 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.

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