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Databricks Certified Data Engineer Professional Sample Questions:

1. A junior data engineer seeks to leverage Delta Lake's Change Data Feed functionality to create a Type 1 table representing all of the values that have ever been valid for all rows in a bronze table created with the property delta.enableChangeDataFeed = true. They plan to execute the following code as a daily job:
Get Latest & Actual Certified-Data-Engineer-Professional Exam's Question and Answers from

Which statement describes the execution and results of running the above query multiple times?

A) Each time the job is executed, only those records that have been inserted or updated since the last execution will be appended to the target table giving the desired result.
B) Each time the job is executed, the differences between the original and current versions are calculated; this may result in duplicate entries for some records.
C) Each time the job is executed, newly updated records will be merged into the target table, overwriting previous values with the same primary keys.
D) Each time the job is executed, the target table will be overwritten using the entire history of inserted or updated records, giving the desired result.
E) Each time the job is executed, the entire available history of inserted or updated records will be appended to the target table, resulting in many duplicate entries.

2. A Databricks SQL dashboard has been configured to monitor the total number of records present in a collection of Delta Lake tables using the following query pattern:
SELECT COUNT (*) FROM table
Which of the following describes how results are generated each time the dashboard is updated?

A) The total count of records is calculated from the Hive metastore
B) The total count of records is calculated from the Delta transaction logs
C) The total count of rows will be returned from cached results unless REFRESH is run
D) The total count of records is calculated from the parquet file metadata
E) The total count of rows is calculated by scanning all data files

3. An upstream system has been configured to pass the date for a given batch of data to the Databricks Jobs API as a parameter. The notebook to be scheduled will use this parameter to load data with the following code:
df = spark.read.format("parquet").load(f"/mnt/source/(date)")
Which code block should be used to create the date Python variable used in the above code block?

A) date = spark.conf.get("date")
B) input_dict = input()
date= input_dict["date"]
C) import sys
date = sys.argv[1]
D) dbutils.widgets.text("date", "null")
date = dbutils.widgets.get("date")
E) date = dbutils.notebooks.getParam("date")

4. When evaluating the Ganglia Metrics for a given cluster with 3 executor nodes, which indicator would signal proper utilization of the VM's resources?

A) Bytes Received never exceeds 80 million bytes per second
B) CPU Utilization is around 75% Get Latest & Actual Certified-Data-Engineer-Professional Exam's Question and Answers from
C) Total Disk Space remains constant
D) Network I/O never spikes
E) The five Minute Load Average remains consistent/flat

5. 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) No; the change data feed only tracks inserts and updates not deleted records.
B) Yes; Delta Lake ACID guarantees provide assurance that the DELETE command successed fully and permanently purged these 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; the change data feed uses foreign keys to ensure delete consistency throughout the Lakehouse.

Solutions: