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Databricks Certified Data Engineer Professional Sample Questions:

1. A Spark job is taking longer than expected. Using the Spark UI, a data engineer notes that the Min, Median, and Max Durations for tasks in a particular stage show the minimum and median time to complete a task as roughly the same, but the max duration for a task to be roughly 100 times as long as the minimum.
Which situation is causing increased duration of the overall job?

A) Task queueing resulting from improper thread pool assignment.
B) Spill resulting from attached volume storage being too small.
C) Credential validation errors while pulling data from an external system.
D) Network latency due to some cluster nodes being in different regions from the source data
E) Skew caused by more data being assigned to a subset of spark-partitions.

2. A data engineer wants to ingest a large collection of image files (JPEG and PNG) from cloud object storage into a Unity Catalog-managed table for analysis and visualization. Which two configurations and practices are recommended to incrementally ingest these images into the table? (Choose two.)

A) Use the pathGlobFilter option to select only image files (e.g., "*.jpg,*.png").
B) Use Auto Loader and set cloudFiles.format to "TEXT".
C) Move files to a volume and read with SQL editor.
D) Use Auto Loader and set cloudFiles.format to "BINARYFILE".
E) Use Auto Loader and set cloudFiles.format to "IMAGE".

3. A small company based in the United States has recently contracted a consulting firm in India to implement several new data engineering pipelines to power artificial intelligence applications. All the company's data is stored in regional cloud storage in the United States.
The workspace administrator at the company is uncertain about where the Databricks workspace used by the contractors should be deployed.
Assuming that all data governance considerations are accounted for, which statement accurately informs this decision?

A) Databricks notebooks send all executable code from the user's browser to virtual machines over the open internet; whenever possible, choosing a workspace region near the end users is the most secure.
B) Databricks runs HDFS on cloud volume storage; as such, cloud virtual machines must be deployed in the region where the data is stored.
C) Databricks workspaces do not rely on any regional infrastructure; as such, the decision should be made based upon what is most convenient for the workspace administrator.
D) Databricks leverages user workstations as the driver during interactive development; as such, users should always use a workspace deployed in a region they are physically near.
E) Cross-region reads and writes can incur significant costs and latency; whenever possible, compute should be deployed in the same region the data is stored.

4. The data architect has mandated that all tables in the Lakehouse should be configured as external (also known as "unmanaged") Delta Lake tables.
Which approach will ensure that this requirement is met?

A) When the workspace is being configured, make sure that external cloud object storage has been mounted.
B) When a database is being created, make sure that the LOCATION keyword is used.
C) When tables are created, make sure that the EXTERNAL keyword is used in the CREATE TABLE statement.
D) When data is saved to a table, make sure that a full file path is specified alongside the Delta format.
E) When configuring an external data warehouse for all table storage, leverage Databricks for all ELT.

5. 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 fail completely because of the constraint violation and no records will be inserted into the target table.
B) The write will fail when the violating record is reached; any records previously processed will be recorded to the target table.
C) The write will include all records in the target table; any violations will be indicated in the boolean column named valid_coordinates.
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.

Solutions: