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Questions and Answers
What does physical data independence allow a database administrator to do?
What does physical data independence allow a database administrator to do?
- Alter the view level without changing the logical data.
- Change the logical schema without affecting the data storage.
- Upgrade the storage system without impacting the logical schema. (correct)
- Modify the database constraints without any effect on the data.
Which statement best describes logical data independence?
Which statement best describes logical data independence?
- It allows changes to be made at the physical level without affecting logical schemas.
- It facilitates modifications to the logical schema that do not impact the actual data on disk. (correct)
- It restricts changes to the database structure to avoid data loss.
- It permits changes in data formats that require schema alterations.
Which of the following scenarios illustrates physical data independence?
Which of the following scenarios illustrates physical data independence?
- Changing a database table's primary key without data loss.
- Modifying the format of existing data entries in a table.
- Adding a constraint to a table affecting data integrity.
- Upgrading from hard disks to SSDs without altering logical schemas. (correct)
What is an outcome of logical data independence?
What is an outcome of logical data independence?
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Which of the following defines logical data?
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.
