Data Terms Intermediate Quiz 3
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Quiz 3
1. In a Star Schema, what is the central table called?
Dimension Table
Fact Table
Reference Table
2. Which schema normalizes dimension tables into multiple related tables?
Galaxy Schema
Flat Schema
Snowflake Schema
3. What is the goal of "Dimensional Modeling"?
Making data warehouses easy for business users to query
Measuring the physical size of data
Creating 3D visualizations of data
4. What is a "Slowly Changing Dimension" (SCD)?
A table that loads very slowly
A dimension that tracks historical changes over time
A column that never updates
5. What does an "ERD" (Entity Relationship Diagram) help visualize?
How tables in a database relate to each other
The speed of server connections
The flow of electricity in a data center
6. Which term describes a copy of a database at a specific point in time?
Log
Archive
Snapshot
7. What is "Data Granularity"?
The physical weight of a hard drive
The level of detail represented by a single row of data
The total number of tables in a database
8. What is a "Composite Key"?
A primary key made up of two or more columns
A key that is encrypted twice
A key used only for temporary tables
9. In data modeling, what is "Cardinality"?
The color coding of an ERD
The total size of the database in gigabytes
The numerical relationship between rows in two tables (e.g., one-to-many)
10. What is "Data Denormalization" typically used for?
Saving storage space
Improving read performance in a Data Warehouse
Ensuring data is perfectly unique
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