Data Warehouse free Online exam Modal test1

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1. Which of the following features usually applies to data in a data warehouse?
Data are often deleted	Most applications consist of transactions
Data are rarely deleted	Relatively few records are processed by applications

2. Which of the following statement is true?
The data warehouse consists of data marts and operational data	The data warehouse is used as a source for the operational data
The operational data are used as a source for the data warehouse	All of the above

3. The following is true of three-tier data warehouses:
Once created, the data marts will keep on being updated from the data warehouse at periodic times	Once created, the data marts will directly receive their new data from the operational databases
The data marts are different groups of tables in the data warehouse	A data mart becomes a data warehouse when it reaches a critical size

4. The following technology is not well-suited for data mining:
Expert system technology	Data visualization
Technology limited to specific data types such as numeric data types	Parallel architecture

5. What is true of the multidimensional model?
It typically requires less disk storage	It typically requires more disk storage
Typical business queries requiring aggregate functions take more time	Increasing the size of a dimension is difficult

6. The value at the intersection of the row labeled "India" and the column "Savings" in Table2 should be:
800,000	300,000
200,000	300,000

7. We want to add the following capabilities to Table2: show the data for 3 age groups (20-39, 40-60, over 60), 3 revenue groups (less than $10,000, $10,000-$30,000, over $30,000) and add a new type of account: Money market. The total number of measures will be:
4	More than 100
Between 10 and 30	Between 40 and 60

8. We want to add the following capability to Table2: for each type of account in each region, also show the dollar amount besides the number of customers. This adds to Table2:
Another dimension	Other column(s)
Other row(s)	Another measure for each cell

9. The most common source of change data in refreshing a data warehouse is:
Queryable change data	Cooperative change data
Logged change data	Snapshot change data

10. Which of the following statements is not true about refreshing a data warehouse:
It is a process of managing timing differences between the updating of data sources and the related data warehouse objects	Updates to dimension tables may occur at different times than the fact table
The data warehouse administrator has more control over the load time lag than the valid time lag	None of the above

11. A data warehouse is which of the following?
Can be updated by end users	Contains numerous naming conventions and formats
Organized around important subject areas	Contains only current data

12. An operational system is which of the following?
A system that is used to run the business in real time and is based on historical data	A system that is used to run the business in real time and is based on current data
A system that is used to support decision making and is based on current data	A system that is used to support decision making and is based on historical data

13. The generic two-level data warehouse architecture includes which of the following?
At least one data mart	Data that can extracted from numerous internal and external sources
Near real-time updates	All of the above

14. The active data warehouse architecture includes which of the following?
At least one data mart	Data that can extracted from numerous internal and external sources
Near real-time updates	All of the above

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

16. Transient data is which of the following?
Data in which changes to existing records cause the previous version of the records to be eliminated	Data in which changes to existing records do not cause the previous version of the records to be eliminated
Data that are never altered or deleted once they have been added	Data that are never deleted once they have been added

17. The extract process is which of the following?
Capturing all of the data contained in various operational systems	Capturing a subset of the data contained in various operational systems
Capturing all of the data contained in various decision support systems	Capturing a subset of the data contained in various decision support systems

18. Data scrubbing is which of the following?
A process to reject data from the data warehouse and to create the necessary indexes	A process to load the data in the data warehouse and to create the necessary indexes
A process to upgrade the quality of data after it is moved into a data warehouse	A process to upgrade the quality of data before it is moved into a data warehouse

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

20. Data transformation includes which of the following?
A process to change data from a detailed level to a summary level	A process to change data from a summary level to a detailed level
Joining data from one source into various sources of data	Separating data from one source into various sources of data