Database - Data Warehousing MCQs Part

1. Data scrubbing is which of the following?

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

 Answer Option D

2. The @active data warehouse architecture includes which of the following?

A.
At least one data mart
B.
Data that can extracted from numerous internal and external sources
C.
Near real-time updates
D.
All of the above.

 Answer Option D

3. A goal of data mining includes which of the following?

A.
To explain some observed event or condition
B.
To confirm that data exists
C.
To analyze data for expected relationships
D.
To create a new data warehouse

 Answer Option A

4. An operational system is which of the following?

A.
A system that is used to run the business in real time and is based on historical data.
B.
A system that is used to run the business in real time and is based on current data.
C.
A system that is used to support decision making and is based on current data.
D.
A system that is used to support decision making and is based on historical data.

 Answer Option B

5. A data warehouse is which of the following?

A.
Can be updated by end users.
B.
Contains numerous naming conventions and formats.
C.
Organized around important subject areas.
D.
Contains only current data.

 Answer Option C

6. A snowflake schema is which of the following types of tables?

A. Fact
B. Dimension
C. Helper
D. All of the above

 Answer Option D

7. The generic two-level data warehouse architecture includes which of the following?

A. At least one data mart
B. Data that can extracted from numerous internal and external sources
C. Near real-time updates
D. All of the above.

 Answer Option B

8. Fact tables are which of the following?

A. Completely denoralized
B. Partially denoralized
C. Completely normalized
D. Partially normalized

 Answer Option C

9. Data transformation includes which of the following?

A. A process to change data from a detailed level to a summary level
B. A process to change data from a summary level to a detailed level
C. Joining data from one source into various sources of data
D. Separating data from one source into various sources of data

 Answer Option A

10. Reconciled data is which of the following?

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.

 Answer Option B

11. The load and index is which of the following?

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

 Answer Option B

12. The extract process is which of the following?

A. Capturing all of the data contained in various operational systems
B. Capturing a subset of the data contained in various operational systems
C. Capturing all of the data contained in various decision support systems
D. Capturing a subset of the data contained in various decision support systems

 Answer Option B

13. A star schema has what type of relationship between a dimension and fact table?

A. Many-to-many
B. One-to-one
C. One-to-many
D. All of the above.

 Answer Option C

14. Transient data is which of the following?

A. Data in which changes to existing records cause the previous version of the records to be eliminated
B. Data in which changes to existing records do not cause the previous version of the records to be eliminated
C. Data that are never altered or deleted once they have been added
D. Data that are never deleted once they have been added

 Answer Option A

15. A multifield transformation does which of the following?

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

 Answer Option D

6. A snowflake schema is which of the following types of tables?

A. Fact
B. Dimension
C. Helper
D. All of the above

 Answer Option D

7. The generic two-level data warehouse architecture includes which of the following?

A. At least one data mart
B. Data that can extracted from numerous internal and external sources
C. Near real-time updates
D. All of the above.

 Answer Option B

8. Fact tables are which of the following?

A. Completely denoralized
B. Partially denoralized
C. Completely normalized
D. Partially normalized

 Answer Option C

9. Data transformation includes which of the following?

A. A process to change data from a detailed level to a summary level
B. A process to change data from a summary level to a detailed level
C. Joining data from one source into various sources of data
D. Separating data from one source into various sources of data

 Answer Option A

10. Reconciled data is which of the following?

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.

 Answer Option B

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