Data Warehousing MCQ Questions and Answers for Practice

1. Bill Inmon has estimated___________of the time required to build a data warehouse, is consumed inthe conversion process.

1. 10 percent.
2. 20 percent.
3. 40 percent
4. 80 percent

2. The time horizon in Data warehouse is usually

1. 1-2 years.
2. 3-4years.
3. 5-6 years.
4. 5-10 years.

3. The time horizon in operational environment is

1. 30-60 days.
2. 60-90 days.
3. 90-120 days.
4. 120-150 days.

4. Data transformation includes

1. a process to change data from a detailed level to a summary level.
2. a process to change data from a summary level to a detailed level.
3. joining data from one source into various sources of data.
4. separating data from one source into various sources of data.

5. Data scrubbing is

1. a process to reject data from the data warehouse and to create the necessary indexes.
2. a process to load the data in the data warehouse and tocreate the necessary indexes.
3. a process to upgrade the quality of data after it is moved into a data warehouse.
4. a process to upgrade the quality of data before it is movedinto a data warehouse

6. The load and index is

1. a process to reject data from the data warehouse and to create the necessary indexes.
2. a process to load the data in the data warehouse and to create the necessary indexes.
3. a process to upgrade the quality of data after it is moved into a data warehouse.
4. a process to upgrade the quality of data before it is moved into a data warehouse.

7. The modern CASE tools belong to _______ category.

1. analysis.
2. Development
3. Coding
4. Delivery

8. ________________ is held in the catalog of the warehouse database system.

1. Application level metadata.
2. Algorithmic level metadata.
3. Departmental level metadata.
4. Corewarehouse metadata.

9. _________maps the core warehouse metadata to business concepts, familiar and useful to end users.

1. Application level metadata.
2. User level metadata.
3. Enduser level metadata.
4. Core level metadata.

10. The generic two-level data warehouse architecture includes

1. at least one data mart.
2. data that can extracted from numerous internal and external sources.
3. near realtimeupdates.
4. far reaz-time updates.

11. The active data warehouse architecture includes

1. at least one data mart.
2. data that can extracted from numerous internal and external sources.
3. near real-time updates.
4. all of the above.

12. The data administration subsystem helps you perform all of the following, except

1. backups and recovery.
2. query optimization.
3. security management.
4. create, change, and delete information.

13. A data warehouse iswhich of the following?

1. Can be updated by end users.
2. Contains numerous naming conventions and formats.
3. Organized around important subject areas.
4. Contains only current data.

14. The extract process is

1. capturing all of the data contained in various operational systems.
2. capturing a subset of the data contained in various operational systems.
3. capturing all of the data contained in various decision support systems.
4. capturing a subset of the data contained in various decision support systems.

15. ______consists of formal definitions, such as a COBOL layout or a database schema.

1. Classical metadata.
2. Transformation metadata.
3. Historical metadata.
4. Structural metadata.