Databricks Data Engineer Associate Question 223
Select 2A data engineering team is working with Delta Lake to build a data pipeline on Databricks. They want to ensure that their operations such as updates, deletes, and merges are atomic and consistent, even in the case of concurrent writes or failures. Which features of Delta Lake provide ACID transactions?
- A
Delta Lake's transaction log
- B
Delta Lake's schema enforcement
- C
Delta Lake's compaction process
- D
Optimized reads using caching
- E
Versioned data storage
Show answer and explanation
Correct answers: A, E
Explanation
Delta Lake provides ACID transactions through its transaction log and versioned data storage. The transaction log ensures atomicity and consistency by recording all changes to the data and enabling rollbacks in case of failures. Versioned data storage supports isolation and durability by allowing concurrent reads and writes while maintaining a consistent view of the data.
- A. Correct.
Delta Lake's transaction log is a core feature that ensures atomicity, consistency, isolation, and durability (ACID) by tracking all changes to the Delta table.
- B. Incorrect.
Schema enforcement is related to maintaining data integrity by ensuring consistency in data structure, but it does not directly provide ACID transactions.
- C. Incorrect.
The compaction process helps with storage optimization and performance but does not contribute to ensuring ACID transactions.
- D. Incorrect.
Optimized reads using caching improve query performance but are unrelated to ACID transaction guarantees.
- E. Correct.
Versioned data storage enables Delta Lake to maintain snapshots of data over time, which supports the isolation and durability aspects of ACID transactions.