Data Warehousing

Q1. Which of the following is data scrubbing?

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

Q2. What is Reconciled data?

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

Q3. which of the following types of tables is a snowflake schema?

Dimension
Fact
Helper
All of the above

Q4. which of the following are Fact tables?

Completely denoralized
Partially denoralized
Completely normalized
Partially normalized

Q5. Which of the following is an operational system?

A system that is used to run the business in real time and is based on historical data
A system that is used to support decision making 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

Q6. Which of the following is a data warehouse?

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

Q7. What is Transient data?

Data that are never deleted once they have been added
Data in which changes to existing records cause the previous version of the records to be eliminated
Data that are never altered or 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

Q8. Data transformation includes?

Joining data from one source into various sources of data
Separating data from one source into various sources of data
A process to change data from a summary level to a detailed level
A process to change data from a detailed level to a summary level

Q9. 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

Q10. The extract process is?

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

Q11. The load and index is?

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

Q12. A goal of data mining includes What?

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

Q13. what type of relationship between a dimension and fact table in a star schema?

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

Q14. What does a multifield transformation?

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

Q15. The @active data warehouse architecture includes What?

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

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Introduction To Data Warehousing

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