Databricks Data Engineer Associate Question 227
Select 4A data engineering team uses Delta Lake for their ETL pipelines. They want to ensure data consistency during concurrent writes and reads, as well as support for rollback in the event of job failures. Which scenarios best demonstrate Delta Lake's ACID transaction capabilities?
- A
Updating records in a Delta table while multiple users perform read operations on the same table
- B
Performing a rollback to a previous version of a Delta table after an incorrect data update
- C
Appending new data to a Delta table without ensuring schema enforcement
- D
Reading consistent data snapshots from a Delta table while a write operation is in progress
- E
Performing a delete operation that removes specific records from a Delta table without corrupting the data
Show answer and explanation
Correct answers: A, B, D, E
Explanation
Delta Lake provides ACID transactions to ensure data consistency, isolation, durability, and atomicity. These properties are demonstrated in scenarios involving concurrent operations, rollback support, consistent reads during writes, and atomic delete operations. However, schema enforcement is a separate feature and is not directly related to Delta Lake's ACID guarantees.
- A. Correct.
Correct: Delta Lake's ACID transactions ensure that updates to a table are isolated and consistent, allowing multiple users to read the table without conflicts.
- B. Correct.
Correct: Delta Lake supports versioning and time travel, enabling rollbacks to previous table versions, which is an essential aspect of ACID properties.
- C. Incorrect.
Incorrect: Delta Lake enforces schema evolution and schema enforcement, so appending data without proper schema handling is not valid. This does not demonstrate ACID properties.
- D. Correct.
Correct: Delta Lake's ACID transactions provide consistent reads through snapshot isolation, even when concurrent write operations are in progress.
- E. Correct.
Correct: Delta Lake's ACID capabilities ensure that delete operations are atomic and do not leave the table in an inconsistent state.