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Databricks Certified Professional Data Engineer Exam Sample Questions (Q14-Q19):

NEW QUESTION # 14
Where are Interactive notebook results stored in Databricks product architecture?

A. Databricks web application
B. Data plane
C. Control plane
D. Data and Control plane
E. JDBC data source

Answer: D

Explanation:
Explanation
The answer is Data and Control plane,
Only Job results are stored in Data Plane(your storage), Interactive notebook results are stored in a combination of the control plane (partial results for presentation in the UI) and customer storage.
https://docs.microsoft.com/en-us/azure/databricks/getting-started/overview#--high-level-architecture Snippet from the above documentation, Graphical user interface, application Description automatically generated

How to change this behavior?
You can change this behavior using Workspace/Admin Console settings for that workspace, once enabled all of the interactive results are stored in the customer account(data plane) except the new notebook visualization feature Databricks has recently introduced, this still stores some metadata in the control pane irrespective of the below settings. please refer to the documentation for more details.
Graphical user interface, text, application, email Description automatically generated

Why is this important to know?
I recently worked on a project where we had to deal with sensitive information of customers and we had a security requirement that all of the data need to be stored in the data plane including notebook results.

NEW QUESTION # 15
A Delta Lake table was created with the below query:
Consider the following query:
DROP TABLE prod.sales_by_store -
If this statement is executed by a workspace admin, which result will occur?

A. Nothing will occur until a COMMIT command is executed.
B. The table will be removed from the catalog but the data will remain in storage.
C. Data will be marked as deleted but still recoverable with Time Travel.
D. An error will occur because Delta Lake prevents the deletion of production data.
E. The table will be removed from the catalog and the data will be deleted.

Answer: E

Explanation:
When a table is dropped in Delta Lake, the table is removed from the catalog and the data is deleted. This is because Delta Lake is a transactional storage layer that provides ACID guarantees. When a table is dropped, the transaction log is updated to reflect the deletion of the table and the data is deleted from the underlying storage. References:
* https://docs.databricks.com/delta/quick-start.html#drop-a-table
* https://docs.databricks.com/delta/delta-batch.html#drop-table

NEW QUESTION # 16
Which of the following techniques structured streaming uses to ensure recovery of failures during stream processing?

A. Checkpointing and write-ahead logging
B. The stream will failover to available nodes in the cluster
C. Write ahead logging and watermarking
D. Checkpointing and Idempotent sinks
E. Delta time travel
F. Checkpointing and Watermarking

Answer: A

Explanation:
Explanation
The answer is Checkpointing and write-ahead logging.
Structured Streaming uses checkpointing and write-ahead logs to record the offset range of data being processed during each trigger interval.

NEW QUESTION # 17
What is a method of installing a Python package scoped at the notebook level to all nodes in the currently active cluster?

A. Use &sh install in a notebook cell
B. Install libraries from PyPi using the cluster UI
C. Use &Pip install in a notebook cell
D. Run source env/bin/activate in a notebook setup script

Answer: B

Explanation:
Installing a Python package scoped at the notebook level to all nodes in the currently active cluster in Databricks can be achieved by using the Libraries tab in the cluster UI. This interface allows you to install libraries across all nodes in the cluster. While the%pipcommand in a notebook cell would only affect the driver node, using the cluster UI ensures that the package is installed on all nodes.
References:
* Databricks Documentation on Libraries: Libraries

NEW QUESTION # 18
A Delta Lake table was created with the below query:

Consider the following query:
DROP TABLE prod.sales_by_store -
If this statement is executed by a workspace admin, which result will occur?

A. Nothing will occur until a COMMIT command is executed.
B. The table will be removed from the catalog but the data will remain in storage.
C. Data will be marked as deleted but still recoverable with Time Travel.
D. An error will occur because Delta Lake prevents the deletion of production data.
E. The table will be removed from the catalog and the data will be deleted.

Answer: E

NEW QUESTION # 19
......

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