1. What is a Data Cube in the context of Data Warehousing?
a) A data structure that allows multi-dimensional analysis
b) A type of database
c) A two-dimensional data table
d) A data visualization tool
Answer: a) A data structure that allows multi-dimensional analysis
2. What operation is used to roll up data to a higher level of aggregation in a data cube?
a) Drill-down
b) Roll-up
c) Pivot
d) Slice
Answer: b) Roll-up
3. Which of the following is a benefit of using data cubes?
a) Improved transaction speed
b) Better data visualization
c) Multi-dimensional data analysis
d) Simplified data entry
Answer: c) Multi-dimensional data analysis
4. Which operation in a data cube involves viewing data from different perspectives?
a) Slice
b) Dice
c) Pivot
d) Drill-down
Answer: c) Pivot
5. What does the ‘slice’ operation do in the context of a data cube?
a) Selects a single layer of the cube
b) Removes a dimension
c) Combines two or more dimensions
d) Changes the data format
Answer: a) Selects a single layer of the cube
6. Which data cube operation allows users to navigate from more detailed data to summary data?
a) Roll-up
b) Drill-down
c) Dice
d) Slice
Answer: a) Roll-up
7. What is the primary use of data cube technology in data mining?
a) To store large volumes of data
b) To create data models
c) To perform complex multi-dimensional queries
d) To manage transaction processing
Answer: c) To perform complex multi-dimensional queries
8. Which operation would you use to examine data from different combinations of dimensions?
a) Slice
b) Dice
c) Drill-down
d) Roll-up
Answer: b) Dice
9. In a data cube, what does the ‘drill-down’ operation do?
a) Aggregates data to a higher level
b) Summarizes data to a lower level
c) Changes the data format
d) Analyzes data from different dimensions
Answer: b) Summarizes data to a lower level
10. Which type of data cube allows aggregation on one or more dimensions without precomputing all combinations?
a) Fully materialized cube
b) Partially materialized cube
c) ROLAP cube
d) HOLAP cube
Answer: b) Partially materialized cube