Databricks Data Engineer Professional Question 134
Select 3You are managing a Delta Lake table in a Lakehouse architecture that requires regular updates and deletes to maintain data accuracy and consistency. Previously, your team struggled to propagate these changes downstream to other systems and analytics workloads. How does Delta Lake's Change Data Feed (CDF) help address this challenge?
- A
CDF provides an efficient mechanism to track row-level changes (inserts, updates, and deletes) in Delta tables.
- B
CDF automatically applies changes to downstream systems without requiring explicit configuration.
- C
CDF allows consumers to query only the changes since a specific version or timestamp, reducing the need to process the entire table.
- D
CDF enables versioning of changes, allowing downstream systems to synchronize incrementally and maintain data consistency.
- E
CDF eliminates the need for schema enforcement in Delta Lake tables.
Show answer and explanation
Correct answers: A, C, D
Explanation
Delta Lake's Change Data Feed (CDF) addresses the challenge of propagating updates and deletes by providing an efficient mechanism to track row-level changes, allowing downstream systems to query incremental changes since a specific version or timestamp. Additionally, versioning capabilities ensure consistent synchronization. However, CDF does not automate downstream updates or eliminate schema enforcement, which remain separate considerations.
- A. Correct.
Correct: CDF tracks row-level changes, such as inserts, updates, and deletes, helping address the challenge of identifying specific changes to propagate downstream.
- B. Incorrect.
Incorrect: While CDF tracks changes, it does not automatically apply them to downstream systems. Explicit configuration and integration are still required.
- C. Correct.
Correct: CDF allows querying only the changes since a specific version or timestamp, making it efficient for downstream consumers to process incremental updates.
- D. Correct.
Correct: CDF supports versioning, which enables downstream systems to synchronize incrementally and ensures data consistency across systems.
- E. Incorrect.
Incorrect: CDF does not eliminate the need for schema enforcement. Schema enforcement is a separate feature of Delta Lake, unrelated to CDF.