Databricks Data Engineer Associate Question 226
Select 3You are working on a project where multiple data engineers are concurrently updating and querying a Delta Lake table. Which of the following scenarios demonstrates where Delta Lake provides ACID transactions?
- A
Ensuring that a batch job inserting millions of rows into a Delta table does not result in partial writes if the job fails midway.
- B
Allowing multiple users to query a Delta table and ensuring they only see committed and consistent data versions.
- C
Providing schema enforcement for data being written to a Delta table.
- D
Allowing users to delete specific records from a Delta table and ensuring that no uncommitted changes are visible during the operation.
- E
Automatically optimizing the physical layout of the data for faster query performance.
Show answer and explanation
Correct answers: A, B, D
Explanation
Delta Lake provides ACID transactions to ensure data reliability and consistency. This includes preventing partial writes (atomicity), exposing only committed data versions to users (consistency and isolation), and maintaining durability by persisting successful operations. Features like schema enforcement or optimization, while important, do not directly relate to ACID transactions.
- A. Correct.
Correct: Delta Lake ensures atomicity, so partial writes are prevented even in case of job failure. This is an example of how ACID transactions are implemented.
- B. Correct.
Correct: Delta Lake guarantees consistency by exposing only committed data versions to readers, making this a valid example of ACID transactions.
- C. Incorrect.
Incorrect: While schema enforcement is a feature of Delta Lake, it is unrelated to ACID transactions. Schema enforcement pertains to data integrity, not transactional guarantees.
- D. Correct.
Correct: Deleting specific records while ensuring no uncommitted changes are exposed is an example of isolation and durability in ACID transactions.
- E. Incorrect.
Incorrect: Automatic optimization improves query performance but is not related to ACID transactions, which focus on ensuring atomicity, consistency, isolation, and durability.