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Desired Databricks Databricks-Certified-Professional-Data-Engineer Dumps - Free 365 Days Updates [2025]

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Databricks Certified Professional Data Engineer Exam Sample Questions (Q86-Q91):

NEW QUESTION # 86
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 abronzetable created with the propertydelta.enableChangeDataFeed = true. They plan to execute the following code as a daily job:

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

A. 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.
B. Each time the job is executed, newly updated records will be merged into the target table, overwriting previous values with the same primary keys.
C. 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.
D. 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.
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.

Answer: E

Explanation:
Reading table's changes, captured by CDF, using spark.read means that you are reading them as a static source. So, each time you run the query, all table's changes (starting from the specified startingVersion) will be read.

NEW QUESTION # 87
The data architect has mandated that all tables in the Lakehouse should be configured as external (also known as "unmanaged") Delta Lake tables.
Which approach will ensure that this requirement is met?

A. When tables are created, make sure that the EXTERNAL keyword is used in the CREATE TABLE statement.
B. When the workspace is being configured, make sure that external cloud object storage has been mounted.
C. When a database is being created, make sure that the LOCATION keyword is used.
D. When data is saved to a table, make sure that a full file path is specified alongside the Delta format.
E. When configuring an external data warehouse for all table storage, leverage Databricks for all ELT.

Answer: A

Explanation:
To create an external or unmanaged Delta Lake table, you need to use the EXTERNAL keyword in the CREATE TABLE statement. This indicates that the table is not managed by the catalog and the data files are not deleted when the table is dropped. You also need to provide a LOCATION clause to specify the path where the data files are stored. For example:
CREATE EXTERNAL TABLE events ( date DATE, eventId STRING, eventType STRING, data STRING) USING DELTA LOCATION '/mnt/delta/events'; This creates an external Delta Lake table named events that references the data files in the '/mnt/delta/events' path. If you drop this table, the data files will remain intact and you can recreate the table with the same statement.
References:
* https://docs.databricks.com/delta/delta-batch.html#create-a-table
* https://docs.databricks.com/delta/delta-batch.html#drop-a-table

NEW QUESTION # 88
A team member is leaving the team and he/she is currently the owner of the few tables, instead of transfering the ownership to a user you have decided to transfer the ownership to a group so in the future anyone in the group can manage the permissions rather than a single individual, which of the following commands help you accomplish this?

A. ALTER OWNER ON table_name to 'group'
B. ALTER TABLE table_name OWNER to 'group'
C. TRANSFER OWNER table_name to 'group'
D. GRANT OWNER table_name to 'group'*
E. GRANT OWNER On table_name to 'group'

Answer: B

Explanation:
Explanation
The answer is ALTER TABLE table_name OWNER to 'group'
Assign owner to object

NEW QUESTION # 89
A junior data engineer is migrating a workload from a relational database system to the Databricks Lakehouse. The source system uses a star schema, leveraging foreign key constrains and multi-table inserts to validate records on write.
Which consideration will impact the decisions made by the engineer while migrating this workload?

A. Foreign keys must reference a primary key field; multi-table inserts must leverage Delta Lake's upsert functionality.
B. All Delta Lake transactions are ACID compliance against a single table, and Databricks does not enforce foreign key constraints.
C. Committing to multiple tables simultaneously requires taking out multiple table locks and can lead to a state of deadlock.
D. Databricks only allows foreign key constraints on hashed identifiers, which avoid collisions in highly- parallel writes.

Answer: B

Explanation:
In Databricks and Delta Lake, transactions are indeed ACID-compliant, but this compliance is limited to single table transactions. Delta Lake does not inherently enforce foreign key constraints, which are a staple in relational database systems for maintaining referential integrity between tables. This means that when migrating workloads from a relational database system to Databricks Lakehouse, engineers need to reconsider how to maintain data integrity and relationships that were previously enforced by foreign key constraints.
Unlike traditional relational databases where foreign key constraints help in maintaining the consistency across tables, in Databricks Lakehouse, the data engineer has to manage data consistency and integrity at the application level or through careful design of ETL processes.References:
* Databricks Documentation on Delta Lake: Delta Lake Guide
* Databricks Documentation on ACID Transactions in Delta Lake: ACID Transactions in Delta Lake

NEW QUESTION # 90
You are looking to process the data based on two variables, one to check if the department is supply chain and second to check if process flag is set to True

A. if department == "supply chain" & process == TRUE:
B. if department == "supply chain" and process:
C. if department = "supply chain" & process:
D. if department == "supply chain" && process:
E. if department == "supply chain" & if process == TRUE:

Answer: B

NEW QUESTION # 91
......

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