DE-PRO FAQ — Databricks Data Engineer Professional Questions Answered

CDC: Change data capture, where inserts, updates, and deletes are emitted as change events for downstream processing.

DLT: Delta Live Tables, Databricks framework for declarative managed pipelines.

Watermark: Streaming rule that limits how late data may arrive before old state stops updating.

What is DE-PRO?

DE‑PRO is the Databricks Certified Data Engineer Professional exam. It focuses on building and operating production pipelines on Databricks (batch + streaming + reliability + performance).

How is DE-PRO different from DE-ASSOC?

• DE‑ASSOC: fundamentals of Spark + Delta + batch ETL.
• DE‑PRO: production ownership: streaming correctness, orchestration, observability, and tuning.

How long should I study?

Most candidates land between 35 and 130 hours depending on background. See the Study Plan for a 30/60/90-day structure.

What topics matter most?

• Incremental pipelines and CDC (MERGE, idempotency)
• Structured Streaming (checkpointing, watermarks, late data)
• DLT concepts (pipeline structure + quality expectations)
• Performance trade-offs (shuffle/skew, file layout, caching)

What are common weak spots?

• Treating streaming like batch (breaking checkpoint/state assumptions)
• Misunderstanding watermarks and late data semantics
• Thinking “bigger cluster” is always the fix instead of data layout or code changes

What’s the best way to practice?

Use the Resources as your checklist and drill one section at a time in IT Mastery. Keep a miss log; re-drill weak areas within 24–48 hours.