Questions and Answers
What does physical data independence allow a database administrator to do?
Which statement best describes logical data independence?
Which of the following scenarios illustrates physical data independence?
What is an outcome of logical data independence?
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Which of the following defines logical data?
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Study Notes
Data Independence
Physical Data Independence
- Schemas are logical; actual data is stored in binary format on disk.
- Changes to physical storage (e.g., replacing hard drives with SSDs) do not affect logical schema.
- Upgrading memory capacity of storage does not require modifications at the logical schema level.
Logical Data Independence
- Logical data pertains to how data is organized and managed within a database.
- Enables changes in the logical structure of data (e.g., table format) without altering the stored data on the disk.
- Allows modifications to logical data configurations and constraints without impacting the view schema.
- Example includes enforcing constraints on a database table without changing the data itself.
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Description
Explore the two aspects of data independence: physical and logical. Understand how changes to storage and logical structures can be made without impacting the data stored in databases. This quiz will test your knowledge on these essential principles of database management.