Databricks Data Engineer Associate Question 224
Select 3A data engineering team is working on a Delta Lake table to support a financial reporting application. They need to ensure that concurrent updates, deletes, and inserts to the table maintain data consistency and reliability. In which situations does Delta Lake provide ACID compliance to ensure data integrity?
- A
When multiple users concurrently update the same Delta Lake table.
- B
When a streaming job is continuously writing data to a Delta Lake table while a batch job is reading from it.
- C
When a table is updated using standard file operations outside of Delta Lake APIs.
- D
When a transaction fails midway, and the table needs to roll back to its previous state.
- E
When a Delta Lake table is queried using an external tool that does not support Delta Lake.
Show answer and explanation
Correct answers: A, B, D
Explanation
Delta Lake provides ACID compliance by using a transaction log to manage and coordinate changes to the data. This ensures consistency, reliability, and recovery in scenarios like concurrent updates, streaming and batch operations, and transaction failures. However, operations outside the Delta Lake API or tools that do not support Delta Lake cannot leverage these features, and ACID compliance is not maintained in such cases.
- A. Correct.
Correct: Delta Lake ensures ACID compliance for concurrent updates to the same table, as its transaction log keeps track of changes and avoids conflicts.
- B. Correct.
Correct: Delta Lake supports ACID transactions for both streaming and batch workloads, ensuring consistency during concurrent reads and writes.
- C. Incorrect.
Incorrect: Standard file operations outside of Delta Lake APIs bypass the transaction log, breaking ACID compliance.
- D. Correct.
Correct: Delta Lake can roll back to a consistent state when a transaction fails, ensuring atomicity and durability.
- E. Incorrect.
Incorrect: External tools that do not support Delta Lake do not leverage its transaction log, which means ACID compliance cannot be guaranteed.