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Databricks Certified Data Engineer Professional Sample Questions:

1. Which approach demonstrates a modular and testable way to use DataFrame transform for ETL code in PySpark?

A)

B)

C)

D)

2. What statement is true regarding the retention of job run history?

A) It is retained for 90 days or until the run-id is re-used through custom run configuration
B) It is retained for 30 days, during which time you can deliver job run logs to DBFS or S3
C) It is retained for 60 days, after which logs are archived
D) It is retained for 60 days, during which you can export notebook run results to HTML
E) It is retained until you export or delete job run logs

3. A data engineer manages a Unity Catalog table customer_data in schema finance that includes sensitive fields like ssn and credit_score. Intern Group should only see masked values, while Analyst Group should only access rows for their assigned region. The data engineer needs to restrict access based on user role and region without duplicating data. How should the data engineer enforce this security policy?

A) Create views using current_user() and is_account_group_member() functions, and apply masking logic inside the SQL SELECT clause for each sensitive column.
B) Use Unity Catalog's row filters based on the region and column masks based on user roles.
C) Use Unity Catalog's row filters based on the user roles and column masks based on the region.
D) Create dynamic views for each user role and manage access with ACLs.

4. Which configuration parameter directly affects the size of a spark-partition upon ingestion of data into Spark?

A) spark.sql.autoBroadcastJoinThreshold
B) spark.sql.files.openCostInBytes
C) spark.sql.adaptive.advisoryPartitionSizeInBytes
D) spark.sql.adaptive.coalescePartitions.minPartitionNum
E) spark.sql.files.maxPartitionBytes

5. A Delta table of weather records is partitioned by date and has the below schema:
date DATE, device_id INT, temp FLOAT, latitude FLOAT, longitude FLOAT
To find all the records from within the Arctic Circle, you execute a query with the below filter:
latitude > 66.3
Which statement describes how the Delta engine identifies which files to load?

A) The Hive metastore is scanned for min and max statistics for the latitude column
B) All records are cached to attached storage and then the filter is applied
C) The Delta log is scanned for min and max statistics for the latitude column
D) The Parquet file footers are scanned for min and max statistics for the latitude column
E) All records are cached to an operational database and then the filter is applied

Solutions: