Databricks Data Engineer Professional Question 130
Select 3As a data engineer, you are tasked with processing raw IoT sensor data stored in the bronze layer of your Delta Lake architecture. The goal is to promote this data to the silver layer. Which of the following objectives should guide your data transformation process during this promotion?
- A
Filter out invalid or corrupted records from the raw dataset to ensure data quality.
- B
Perform aggregations to calculate summary statistics for downstream reporting.
- C
Enrich the data by joining it with reference datasets to add meaningful context.
- D
Ensure the data is stored in a highly denormalized format for optimized query performance.
- E
Standardize and normalize data formats, such as timestamps and categorical values, for consistency.
Show answer and explanation
Correct answers: A, C, E
Explanation
The silver layer in the Delta Lake architecture serves as a refined and enriched version of the raw data stored in the bronze layer. The primary objectives during this transformation are to clean the data (e.g., removing invalid records), enrich it by adding contextual information (e.g., through joins with reference data), and ensure standardized formats for consistency. Tasks like aggregations and denormalized storage are typically reserved for the gold layer, which is designed for analytical and reporting use cases.
- A. Correct.
Correct: Filtering out invalid or corrupted records is a key step in the bronze-to-silver transformation to ensure the downstream data is clean and reliable.
- B. Incorrect.
Incorrect: Performing aggregations is typically a task for the gold layer, where data is prepared for analytical and reporting use cases, not for the silver layer.
- C. Correct.
Correct: Enriching data by joining with reference datasets is an important silver-layer objective to add context and make the data more useful for downstream applications.
- D. Incorrect.
Incorrect: Highly denormalized data storage is more relevant to the gold layer, where query optimization for analytical use is prioritized. The silver layer focuses on clean and enriched data.
- E. Correct.
Correct: Standardizing and normalizing data formats ensures consistency and usability for downstream processing and is a key silver-layer objective.