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Data Warehousing

Data Warehousing

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Q1. What is Transient data?
1. Data in which changes to existing records cause the previous version of the records to be eliminated
2. Data in which changes to existing records do not cause the previous version of the records to be eliminated
3. Data that are never deleted once they have been added
4. Data that are never altered or deleted once they have been added
Q2. The generic two-level data warehouse architecture includes?
1. Data that can extracted from numerous internal and external sources
2. All of the above
3. Near real-time updates
4. At least one data mart
Q3. Which of the following is data scrubbing?
1. A process to upgrade the quality of data after it is moved into a data warehouse
2. A process to upgrade the quality of data before it is moved into a data warehouse
3. A process to reject data from the data warehouse and to create the necessary indexes
4. A process to load the data in the data warehouse and to create the necessary indexes
Q4. what type of relationship between a dimension and fact table in a star schema?
1. All of the above
2. Many-to-many
3. One-to-many
4. One-to-one
Q5. A goal of data mining includes What?
1. To analyze data for expected relationships
2. To create a new data warehouse
3. To confirm that data exists
4. To explain some observed event or condition
Q6. Which of the following is a data warehouse?
1. Organized around important subject areas
2. Contains numerous naming conventions and formats
3. Can be updated by end users
4. Contains only current data
Q7. 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 decision support systems
3. Capturing a subset of the data contained in various operational systems
4. Capturing all of the data contained in various decision support systems
Q8. The @active data warehouse architecture includes What?
1. Data that can extracted from numerous internal and external sources
2. All of the above
3. At least one data mart
4. Near real-time updates
Q9. What is Reconciled data?
1. Current data intended to be the single source for all decision support systems
2. Data that has been selected and formatted for end-user support applications
3. Data stored in one operational system in the organization
4. Data stored in the various operational systems throughout the organization
Q10. Which of the following is an operational system?
1. A system that is used to support decision making and is based on current data
2. A system that is used to support decision making and is based on historical data
3. A system that is used to run the business in real time and is based on current data
4. A system that is used to run the business in real time and is based on historical data
Q11. What does a multifield transformation?
1. All of the above
2. Converts data from multiple fields into one field
3. Converts data from one field into multiple fields
4. Converts data from multiple fields into multiple fields
Q12. Data transformation includes?
1. A process to change data from a summary level to a detailed level
2. A process to change data from a detailed level to a summary level
3. Separating data from one source into various sources of data
4. Joining data from one source into various sources of data
Q13. which of the following types of tables is a snowflake schema?
1. Helper
2. All of the above
3. Fact
4. Dimension
Q14. The load and index is?
1. A process to upgrade the quality of data after it is moved into a data warehouse
2. A process to reject data from the data warehouse and to create the necessary indexes
3. A process to upgrade the quality of data before it is moved into a data warehouse
4. A process to load the data in the data warehouse and to create the necessary indexes
Q15. which of the following are Fact tables?
1. Partially denoralized
2. Partially normalized
3. Completely denoralized
4. Completely normalized

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Introduction To Data Warehousing

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