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Databricks-Certified-Professional-Data-Engineer Exam Dumps : Databricks Certified Data Engineer Professional Exam

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Databricks Certified Data Engineer Professional Exam Questions and Answers

Question 1

A data engineer is performing a join operating to combine values from a static userlookup table with a streaming DataFrame streamingDF.

Which code block attempts to perform an invalid stream-static join?

Options:

A.

userLookup.join(streamingDF, ["userid"], how="inner")

B.

streamingDF.join(userLookup, ["user_id"], how="outer")

C.

streamingDF.join(userLookup, ["user_id”], how="left")

D.

streamingDF.join(userLookup, ["userid"], how="inner")

E.

userLookup.join(streamingDF, ["user_id"], how="right")

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Question 2

Which is a key benefit of an end-to-end test?

Options:

A.

It closely simulates real world usage of your application.

B.

It pinpoint errors in the building blocks of your application.

C.

It provides testing coverage for all code paths and branches.

D.

It makes it easier to automate your test suite

Question 3

A junior data engineer has been asked to develop a streaming data pipeline with a grouped aggregation using DataFrame df. The pipeline needs to calculate the average humidity and average temperature for each non-overlapping five-minute interval. Incremental state information should be maintained for 10 minutes for late-arriving data.

Streaming DataFrame df has the following schema:

"device_id INT, event_time TIMESTAMP, temp FLOAT, humidity FLOAT"

Code block:

Choose the response that correctly fills in the blank within the code block to complete this task.

Options:

A.

withWatermark("event_time", "10 minutes")

B.

awaitArrival("event_time", "10 minutes")

C.

await("event_time + ‘10 minutes'")

D.

slidingWindow("event_time", "10 minutes")

E.

delayWrite("event_time", "10 minutes")