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Databricks Certified-Data-Engineer-Professional Exam Syllabus Topics:

Databricks Certified Data Engineer Professional Sample Questions:

1. A data engineer has a Delta table orders with deletion vectors enabled. The engineer executes the following command:
DELETE FROM orders WHERE status = 'cancelled';
What should be the behavior of deletion vectors when the command is executed?

A) Files are physically rewritten without the deleted rows.
B) Rows are marked as deleted both in metadata and in files.
C) Rows are marked as deleted in metadata, not in files.
D) Delta automatically removes all cancelled orders permanently.

2. In order to facilitate near real-time workloads, a data engineer is creating a helper function to leverage the schema detection and evolution functionality of Databricks Auto Loader. The desired function will automatically detect the schema of the source directly, incrementally process JSON files as they arrive in a source directory, and automatically evolve the schema of the table when new fields are detected.
The function is displayed below with a blank:

Which response correctly fills in the blank to meet the specified requirements?

A)

B)

C)

D)

E)

3. Which Python variable contains a list of directories to be searched when trying to locate required modules?

A) importlib.resource path
B) os.path
C) sys.path
D) pypi.path
E) pylib.source

4. A data engineer is testing a collection of mathematical functions, one of which calculates the area under a curve as described by another function.
assert(myIntegrate(lambda x: x*x, 0, 3) [0] == 9)
Which kind of the test does the above line exemplify?

A) Unit
B) Manual
C) functional
D) End-to-end
E) Integration

5. A view is registered with the following code:

Both users and orders are Delta Lake tables.
Which statement describes the results of querying recent_orders?

A) All logic will execute at query time and return the result of joining the valid versions of the source tables at the time the query began.
B) All logic will execute when the view is defined and store the result of joining tables to the DBFS; this stored data will be returned when the view is queried.
C) All logic will execute at query time and return the result of joining the valid versions of the source tables at the time the query finishes.
D) Results will be computed and cached when the view is defined; these cached results will incrementally update as new records are inserted into source tables.

Solutions: