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Databricks Certified Data Engineer Professional Sample Questions:

1. The data architect has decided that once data has been ingested from external sources into the Databricks Lakehouse, table access controls will be leveraged to manage permissions for all production tables and views.
The following logic was executed to grant privileges for interactive queries on a production database to the core engineering group.
GRANT USAGE ON DATABASE prod TO eng;
GRANT SELECT ON DATABASE prod TO eng;
Assuming these are the only privileges that have been granted to the eng group and that these users are not workspace administrators, which statement describes their privileges?

A) Group members are able to create, query, and modify all tables and views in the prod database, but cannot define custom functions.
B) Group members are able to query and modify all tables and views in the prod database, but cannot create new tables or views.
C) Group members have full permissions on the prod database and can also assign permissions to other users or groups.
D) Group members are able to query all tables and views in the prod database, but cannot create or edit anything in the database.
E) Group members are able to list all tables in the prod database but are not able to see the results of any queries on those tables.

2. Assuming that the Databricks CLI has been installed and configured correctly, which Databricks CLI command can be used to upload a custom Python Wheel to object storage mounted with the DBFS for use with a production job?

A) jobs
B) workspace
C) libraries
D) configure
E) fs

3. A junior data engineer on your team has implemented the following code block.

The view new_events contains a batch of records with the same schema as the events Delta table. The event_id field serves as a unique key for this table.
When this query is executed, what will happen with new records that have the same event_id as an existing record?

A) They are inserted.
B) They are merged.
C) They are updated.
D) They are ignored.
E) They are deleted.

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

5. A data engineer wants to join a stream of advertisement impressions (when an ad was shown) with another stream of user clicks on advertisements to correlate when impression led to monitizable clicks.

Which solution would improve the performance?

A)

B)

C)

D)

Solutions: