Databricks Data Engineer Associate Question 225
Select 3You are working on a data engineering project where multiple users are concurrently reading from and writing to the same Delta Lake table. Which of the following scenarios demonstrate how Delta Lake ensures ACID transactions?
- A
When a user writes to a Delta table, other users reading the table will always see a consistent snapshot of the data.
- B
Delta Lake uses optimistic concurrency control, ensuring that conflicting writes to the same data are detected and resolved.
- C
Delta Lake automatically creates recovery checkpoints that allow for manual intervention to fix transactional errors.
- D
In the event of a failed write operation, Delta Lake ensures the table remains in its original state without partial writes.
- E
Delta Lake allows schema changes during a transaction without breaking the ACID guarantees.
Show answer and explanation
Correct answers: A, B, D
Explanation
Delta Lake provides ACID transactions by using snapshot isolation for consistent reads, optimistic concurrency control to handle concurrent writes, and fail-safe mechanisms like rolling back failed writes to maintain data integrity. These ensure that the data remains reliable and consistent in multi-user environments.
- A. Correct.
This is correct. By leveraging snapshot isolation, Delta Lake ensures that readers always see a consistent view of the data, even during concurrent writes.
- B. Correct.
This is correct. Delta Lake uses optimistic concurrency control to manage conflicts, ensuring that concurrent writes do not compromise data integrity.
- C. Incorrect.
This is incorrect. Delta Lake does not require manual intervention to fix transactional errors, as it automatically handles failures to maintain ACID compliance.
- D. Correct.
This is correct. Delta Lake prevents partial writes by rolling back changes when a write operation fails, ensuring data integrity.
- E. Incorrect.
This is incorrect. While Delta Lake supports schema evolution, schema changes during a single transaction are not directly related to ACID guarantees.