DATA WAREHOUSING MULTIPLE CHOICE QUESTIONS AND ANSWERS(Beginners)

DATAWAREHOUSING MULTIPLE CHOICE QUESTIONS AND ANSWERS

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

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.
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
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.

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.

6.	A snowflake schema is which of the following types of tables?
	A. Fact B. Dimension C. Helper D. All of the above

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.

8.	Fact tables are which of the following?
	A. Completely denormalized B. Partially denormalized C. Completely normalized D. Partially normalized

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

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

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

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

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.

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
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

16 What is ETL Stand for?

A.    Execute tramit and load

B.    Extract transform and load

C.   Excute Transform and load

D.   All the above

17.	Successful data warehousing requires that a formal program in total quality management (TQM) be implemented.
	A. True B. False

	18.Joining is the process of partitioning data according to predefined criteria.
	A. True B. False

19.The role of the ETL process is to identify erroneous data and to fix them.

A. True B. False

9.	20.Star schema is suited to online transaction processing, and therefore is generally used in operational systems, operational data stores, or an EDW.
	a  True B.  False

ANSWERS

1.D

2.D

3.A

4.B

5.C

6.D

7.B

8.C

9.A

10.B

11.B

12.B

13.C

14.A

15.D

16.B

17.A

18.B

19.B

20.B