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Databricks Databricks-Certified-Data-Engineer-Professional Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Data Modeling and Storage | 20% | - File Formats - Storage Optimization - Data Modeling |
| Databricks Lakehouse Platform | 24% | - Data Management - Lakehouse Architecture - Delta Lake - Unity Catalog |
| Data Processing | 28% | - Data Transformation - Spark SQL - ETL Pipelines - Structured Streaming |
| Data Quality and Governance | 12% | - Data Lineage - Governance - Data Quality |
| Monitoring and Troubleshooting | 16% | - Monitoring - Performance Optimization - Troubleshooting |
Databricks Certified Data Engineer Professional Sample Questions:
A data engineer is configuring a pipeline that will potentially see late-arriving, duplicate records.
In addition to de-duplicating records within the batch, which of the following approaches allows the data engineer to deduplicate data against previously processed records as it is inserted into a Delta table?
- A. Perform an insert-only merge with a matching condition on a unique key.
- B. Set the configuration delta.deduplicate = true.
- C. Perform a full outer join on a unique key and overwrite existing data.
- D. VACUUM the Delta table after each batch completes.
- E. Rely on Delta Lake schema enforcement to prevent duplicate records.
Correct Answer: A 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
A data engineer is attempting to execute the following PySpark code:
df = spark.read.table("sales")
result = df.groupBy("region").agg(sum("revenue"))
However, upon inspecting the execution plan and profiling the Spark job, they observe excessive data shuffling during the aggregation phase.
Which technique should be applied to reduce shuffling during the groupBy aggregation operation?
- A. Repartition by region before aggregation.
- B. Use broadcast join.
- C. Caching the DataFrame df.
- D. Use coalesce() after the aggregation.
Correct Answer: A 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
Which statement describes a key benefit of an end-to-end test?
- A. It pinpoint errors in the building blocks of your application.
- B. It makes it easier to automate your test suite
- C. It closely simulates real world usage of your application.
- D. It provides testing coverage for all code paths and branches.
Correct Answer: C 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
A data engineer wants to create a cluster using the Databricks CLI for a big ETL pipeline. The cluster should have five workers, one driver of type i3.xlarge, and should use the '14.3.x- scala2.12' runtime. Which command should the data engineer use?
- A. databricks compute create 14.3.x-scala2.12 --num-workers 5 --node-type-id i3.xlarge --cluster- name Data Engineer_cluster
- B. databricks compute add 14.3.x-scala2.12 --num-workers 5 --node-type-id i3.xlarge --cluster-name Data Engineer_cluster
- C. databricks clusters create 14.3.x-scala2.12 --num-workers 5 --node-type-id i3.xlarge --cluster- name DataEngineer_cluster
- D. databricks clusters add 14.3.x-scala2.12 --num-workers 5 --node-type-id i3.xlarge --cluster-name Data Engineer_cluster
Correct Answer: C 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
A CHECK constraint has been successfully added to the Delta table named activity_details using the following logic:
A batch job is attempting to insert new records to the table, including a record where latitude =
45.50 and longitude = 212.67.
Which statement describes the outcome of this batch insert?
- A. The write will include all records in the target table; any violations will be indicated in the boolean column named valid_coordinates.
- B. The write will fail completely because of the constraint violation and no records will be inserted into the target table.
- C. The write will fail when the violating record is reached; any records previously processed will be recorded to the target table.
- D. The write will insert all records except those that violate the table constraints; the violating records will be recorded to a quarantine table.
- E. The write will insert all records except those that violate the table constraints; the violating records will be reported in a warning log.
Correct Answer: B 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
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