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Databricks Certified Data Engineer Professional Sample Questions:

1. The data governance team is reviewing user for deleting records for compliance with GDPR. The following logic has been implemented to propagate deleted requests from the user_lookup table to the user aggregate table.

Assuming that user_id is a unique identifying key and that all users have requested deletion have been removed from the user_lookup table, which statement describes whether successfully executing the above logic guarantees that the records to be deleted from the user_aggregates table are no longer accessible and why?

A) Yes; the change data feed uses foreign keys to ensure delete consistency throughout the Lakehouse.
B) No; the change data feed only tracks inserts and updates not deleted records.
C) No; the Delta Lake DELETE command only provides ACID guarantees when combined with the MERGE INTO command
D) No; files containing deleted records may still be accessible with time travel until a BACUM command is used to remove invalidated data files.
E) Yes; Delta Lake ACID guarantees provide assurance that the DELETE command successed fully and permanently purged these records.

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

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

3. Which REST API call can be used to review the notebooks configured to run as tasks in a multi- task job?

A) /jobs/runs/list
B) /jobs/runs/get-output
C) /jobs/list
D) /jobs/runs/get
E) /jobs/get

4. A user wants to use DLT expectations to validate that a derived table report contains all records from the source, included in the table validation_copy.
The user attempts and fails to accomplish this by adding an expectation to the report table definition.
Which approach would allow using DLT expectations to validate all expected records are present in this table?

A) Define a temporary table that perform a left outer join on validation_copy and report, and define an expectation that no report key values are null
B) Define a view that performs a left outer join on validation_copy and report, and reference this view in DLT expectations for the report table
C) Define a SQL UDF that performs a left outer join on two tables, and check if this returns null values for report key values in a DLT expectation for the report table.
D) Define a function that performs a left outer join on validation_copy and report and report, and check against the result in a DLT expectation for the report table

5. A Delta Lake table representing metadata about content posts from users has the following schema:
user_id LONG, post_text STRING, post_id STRING, longitude FLOAT,
latitude FLOAT, post_time TIMESTAMP, date DATE
This table is partitioned by the date column. A query is run with the following filter:
longitude < 20 & longitude > -20
Which statement describes how data will be filtered?

A) The Delta Engine will use row-level statistics in the transaction log to identify the flies that meet the filter criteria.
B) The Delta Engine will scan the parquet file footers to identify each row that meets the filter criteria.
C) No file skipping will occur because the optimizer does not know the relationship between the partition column and the longitude.
D) Statistics in the Delta Log will be used to identify partitions that might Include files in the filtered range.
E) Statistics in the Delta Log will be used to identify data files that might include records in the filtered range.

Solutions: