LFC Medallion Architecture Layers 4

Question 1

What is the recommended approach when a source system changes its schema and sends new fields to the Bronze layer?

Accepted Answer

Allow schema evolution so Bronze absorbs the new fields without pipeline failure

Answer

Bronze should support schema evolution (e.g., Delta Lake's schema evolution) to handle upstream changes without breaking ingestion.

Question 2

A financial services firm must prove that a Gold-layer aggregated metric can be traced back to specific source transactions. Which Medallion feature enables this?

Accepted Answer

Data lineage through retained Bronze and Silver layers

Answer

Because Bronze and Silver are retained, auditors can trace a Gold metric back through Silver cleansing to the original Bronze raw records.

Question 3

Which Medallion layer is MOST appropriate for storing a feature engineering table used as input to a machine learning model?

Accepted Answer

Silver, if features are computed from cleansed data without business aggregation

Answer

Feature tables derived from clean, conformed records but without business-level aggregation are typically housed in the Silver layer.

Question 4

When implementing incremental processing in Medallion Architecture, which Delta Lake feature is used to efficiently identify new Bronze records to process into Silver?

Accepted Answer

Delta Change Data Feed (CDF) or DESCRIBE HISTORY

Answer

Delta Change Data Feed (CDF) exposes row-level changes, and DESCRIBE HISTORY tracks versions, both enabling incremental Silver processing.

Question 5

A Bronze table is growing rapidly and query performance is degrading. Which operation should be applied WITHOUT moving data out of the Bronze layer?

Accepted Answer

Running OPTIMIZE and Z-ORDER on the Bronze Delta table

Answer

OPTIMIZE compacts small files and Z-ORDER co-locates related data, improving scan performance on Delta tables within any layer.

(LFC) Lakehouse Fundamentals Certification Practice Test

(LFC) Lakehouse Fundamentals Certification Practice Test

LFC Medallion Architecture Layers 4