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Databricks Certified Data Engineer Professional Sample Questions:

1. All records from an Apache Kafka producer are being ingested into a single Delta Lake table with the following schema:
key BINARY, value BINARY, topic STRING, partition LONG, offset LONG, timestamp LONG There are 5 unique topics being ingested. Only the "registration" topic contains Personal Identifiable Information (PII). The company wishes to restrict access to PII. The company also wishes to only retain records containing PII in this table for 14 days after initial ingestion.
However, for non-PII information, it would like to retain these records indefinitely.
Which of the following solutions meets the requirements?

A) All data should be deleted biweekly; Delta Lake's time travel functionality should be leveraged to maintain a history of non-PII information.
B) Data should be partitioned by the registration field, allowing ACLs and delete statements to be set for the PII directory.
C) Separate object storage containers should be specified based on the partition field, allowing isolation at the storage level.
D) Data should be partitioned by the topic field, allowing ACLs and delete statements to leverage partition boundaries.
E) Because the value field is stored as binary data, this information is not considered PII and no special precautions should be taken.

2. 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. Events are recorded once per minute per device.
Streaming DataFrame df has the following schema:
"device_id INT, event_time TIMESTAMP, temp FLOAT, humidity FLOAT"
Code block:
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Choose the response that correctly fills in the blank within the code block to complete this task.

A) window("event_time", "10 minutes").alias("time")
B) "event_time"
C) to_interval("event_time", "5 minutes").alias("time")
D) lag("event_time", "10 minutes").alias("time")
E) window("event_time", "5 minutes").alias("time")

3. Which statement describes Delta Lake Auto Compaction?

A) Optimized writes use logical partitions instead of directory partitions; because partition boundaries are only represented in metadata, fewer small files are written.
B) An asynchronous job runs after the write completes to detect if files could be further compacted; if yes, an optimize job is executed toward a default of 128 MB.
C) An asynchronous job runs after the write completes to detect if files could be further compacted; if yes, an optimize job is executed toward a default of 1 GB.
D) Data is queued in a messaging bus instead of committing data directly to memory; all data is committed from the messaging bus in one batch once the job is complete.
E) Before a Jobs cluster terminates, optimize is executed on all tables modified during the most recent job.
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4. The data architect has mandated that all tables in the Lakehouse should be configured as external Delta Lake tables.
Which approach will ensure that this requirement is met?

A) When configuring an external data warehouse for all table storage. leverage Databricks for all ELT.
B) When the workspace is being configured, make sure that external cloud object storage has been mounted.
C) When tables are created, make sure that the external keyword is used in the create table statement.
D) Whenever a database is being created, make sure that the location keyword is used Get Latest & Actual Certified-Data-Engineer-Professional Exam's Question and Answers from
E) Whenever a table is being created, make sure that the location keyword is used.

5. The data governance team has instituted a requirement that all tables containing Personal Identifiable Information (PH) must be clearly annotated. This includes adding column comments, table comments, and setting the custom table property "contains_pii" = true.
The following SQL DDL statement is executed to create a new table:
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Which command allows manual confirmation that these three requirements have been met?

A) DESCRIBE EXTENDED dev.pii test
B) SHOW TBLPROPERTIES dev.pii test
C) DESCRIBE DETAIL dev.pii test
D) SHOW TABLES dev
E) DESCRIBE HISTORY dev.pii test

Solutions: