Exam Databricks-Certified-Data-Engineer-Professional Topic 1 Question 23 Discussion

Actual exam question for Databricks's Databricks-Certified-Data-Engineer-Professional exam
Question #: 23
Topic #: 1
A company stores account transactions in a Delta Lake table. The company needs to apply frequent account-level correlations (e.g., UPDATE statements) but wants to avoid rewriting entire Parquet files for each change to reduce file churn and improve write performance. Which Delta Lake feature should they enable?

Suggested Answer: D Vote an answer

Deletion vectors allow Delta Lake to track row-level deletes and updates without rewriting entire Parquet files. By recording changes separately from the base files, this feature significantly reduces file churn and improves write performance for workloads with frequent row-level modifications such as account-level updates.

by Lucien at Jul 15, 2026, 01:06 AM

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