Data Warehousing

Q1. What is Reconciled data?

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

Q2. what type of relationship between a dimension and fact table in a star schema?

All of the above
Many-to-many
One-to-many
One-to-one

Q3. The extract process is?

Capturing all of the data contained in various decision support systems
Capturing a subset of the data contained in various decision support systems
Capturing a subset of the data contained in various operational systems
Capturing all of the data contained in various operational systems

Q4. The load and index is?

A process to reject data from 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 load the data in the data warehouse and to create the necessary indexes
A process to upgrade the quality of data before it is moved into a data warehouse

Q5. Data transformation includes?

Separating data from one source into various sources of data
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

Q6. The generic two-level data warehouse architecture includes?

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

Q7. A goal of data mining includes What?

To explain some observed event or condition
To create a new data warehouse
To analyze data for expected relationships
To confirm that data exists

Q8. which of the following are Fact tables?

Completely normalized
Partially denoralized
Partially normalized
Completely denoralized

Q9. What does a multifield transformation?

Converts data from multiple fields into one field
Converts data from one field into multiple fields
Converts data from multiple fields into multiple fields
All of the above

Q10. Which of the following is an operational system?

A system that is used to support decision making and is based on historical data
A system that is used to support decision making and is based on current data
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

Q11. What is Transient data?

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

Q12. which of the following types of tables is a snowflake schema?

Dimension
All of the above
Helper
Fact

Q13. The @active data warehouse architecture includes What?

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

Q14. Which of the following is a data warehouse?

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

Q15. Which of the following is data scrubbing?

A process to load the data in the data warehouse and to create the necessary indexes
A process to reject data from 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

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Introduction To Data Warehousing

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