DBX-MLP Databricks · Databricks ML Engineer

Databricks Machine Learning Professional practice test

Databricks Certified Machine Learning Professional. A full practice exam for the Databricks Machine Learning Professional across the whole exam guide: Spark ML pipelines, tuning and evaluation, applyInPandas, Optuna and Ray, scaling and parallelism, nested runs and custom logging, point-in-time feature lookups and online features, the deploy-code lifecycle, unit and integration tests, bundles for ML assets, automated retraining, Lakehouse Monitoring drift and performance metrics, blue-green and canary rollouts, and custom PyFunc serving.

  • 6 practice tests + challenge test
  • 350 questions
  • 50 questions, 100 min per test
  • Pass at 70%

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Free Databricks Machine Learning Professional sample questions

3 questions from the free diagnostic, with answers and explanations.

Question 1 · Using Spark ML

A model must be trained on 2 billion rows that don't fit on one machine, and scored in nightly batches on the same cluster. Which approach fits?

  1. A Spark ML pipeline trained and applied on the cluster
  2. A scikit-learn model trained on a sample of the driver
  3. A pandas model trained after collecting all the rows
  4. A model trained on a laptop and uploaded as a pickle
Show answer

Answer: A (A Spark ML pipeline trained and applied on the cluster)

Spark ML trains and scores distributed models on data that doesn't fit on one machine. Single-node libraries would need sampling or collecting to the driver.

Question 2 · Scaling and Tuning

A team must train one small forecasting model per store, for 3,000 stores, using scikit-learn. Which API parallelizes this across the cluster?

  1. groupBy("store").applyInPandas(train_fn, schema)
  2. df.toPandas() followed by a Python for loop
  3. A single Spark ML model trained on all stores
  4. A pandas UDF that returns one scalar per row
Show answer

Answer: A (groupBy("store").applyInPandas(train_fn, schema))

applyInPandas runs a function on each group as a pandas DataFrame on executors, so per-store models train in parallel.

Question 3 · Advanced MLflow Usage

Which MLflow feature groups the runs of a hyperparameter search under a single parent run?

  1. Nested runs
  2. Run tags only
  3. Model aliases
  4. Experiment permissions
Show answer

Answer: A (Nested runs)

Starting child runs with nested=True inside a parent run groups trials under the parent in the UI.

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What the Databricks Machine Learning Professional practice covers

Share of practice questions per skill area.

  • Drift Detection and Lakehouse Monitoring18%
  • Using Spark ML14%
  • Scaling and Tuning14%
  • Advanced MLflow Usage8%
  • Advanced Feature Store Concepts8%
  • Validation Testing8%
  • Model Lifecycle Management6%
  • Environment Architectures6%
  • Automated Retraining6%
  • Deployment Strategies6%
  • Custom Model Serving6%

Question formats

  • Single choice
  • Multiple select
  • Exhibits (screenshots, diagrams and code)

Career path: Databricks ML Engineer

Train, track and serve machine learning models on Databricks: feature engineering, AutoML, MLflow, Feature Store and Model Serving, then MLOps, monitoring and scale.

  1. DBX-MLA
  2. DBX-MLP

Databricks Machine Learning Professional practice test FAQ

Is there a free Databricks Machine Learning Professional practice test?

Yes. Create a free account and take the Databricks Machine Learning Professional free diagnostic: 10 questions across every skill area of the exam, with a study plan for the topics to work on. You can retake it as often as you like.

How many questions are in each ExamKite Databricks Machine Learning Professional practice test?

Each full practice test has 50 questions with a 100-minute timer, and you pass at 70%. There are 6 practice tests plus a harder challenge test, with 350 questions in total.

Which question formats does the Databricks Machine Learning Professional practice include?

Single choice, multiple select and exhibits (screenshots, diagrams and code), the same formats you meet on the real exam.

Are these real Databricks Machine Learning Professional exam questions?

No. They are original questions written for ExamKite and mapped to the official Databricks exam guide, never copied from the real exam. Using leaked exam questions breaks the certification provider's exam rules and can get your certification revoked.

More answers in the full FAQ.

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