Databricks Data Engineer Associate Question 230
Select 3A data engineering team is using Delta Lake to build a data pipeline. They want to ensure that their data is reliable and consistent, even when multiple users are writing to the same table simultaneously or when a process fails midway. Which benefits of ACID transactions in Delta Lake address these requirements?
- A
Ensures data consistency by allowing multiple writers to work on the same table without conflicts.
- B
Guarantees that partially written data is not visible to readers until a transaction is successfully committed.
- C
Provides automatic data compression to reduce storage costs.
- D
Supports time travel to access previous versions of the data.
- E
Allows rollbacks to a previous consistent state in case of failure.
Show answer and explanation
Correct answers: A, B, E
Explanation
ACID transactions in Delta Lake ensure that data operations are reliable, consistent, and free from corruption, even in concurrent environments or during process failures. Atomicity ensures that a transaction is either fully completed or not visible at all, isolation prevents conflicts between simultaneous writers, and durability allows recovery of data to a consistent state in the case of system failures. These properties make Delta Lake a robust choice for building reliable data pipelines.
- A. Correct.
Ensures data consistency by allowing multiple writers to work on the same table without conflicts through atomicity and isolation, which are key benefits of ACID transactions.
- B. Correct.
Guarantees that partially written data is not visible to readers until a transaction is successfully committed, ensuring data reliability and consistency through atomicity.
- C. Incorrect.
Automatic data compression is not a feature of ACID transactions; it is a separate storage optimization feature.
- D. Incorrect.
Time travel is a feature of Delta Lake but not directly related to ACID transactions. It is implemented using Delta Lake's versioning of data.
- E. Correct.
Rollbacks to a previous consistent state in case of failure are a key benefit of ACID transactions, achieved through atomicity and durability.