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Databricks Certified Professional Data Engineer Exam Sample Questions (Q172-Q177):

NEW QUESTION # 172
Which of the following techniques structured streaming uses to ensure recovery of failures during stream processing?

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

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 # 173
You are currently looking at a table that contains data from an e-commerce platform, each row contains a list of items(Item number) that were present in the cart, when the customer makes a change to the cart the entire information is saved as a separate list and appended to an existing list for the duration of the customer session, to identify all the items customer bought you have to make a unique list of items, you were asked to create a unique item's list that was added to the cart by the user, fill in the blanks of below query by choosing the appropriate higher-order function?
Note: See below sample data and expected output.
Schema: cartId INT, items Array<INT>

Fill in the blanks:
Fill in the blanks:
SELECT cartId, ((items)) FROM carts

• A. ARRAY_DISTINCT, FLATTEN
• B. FLATTEN, ARRAY_DISTINCT
• C. ARRAYDISTINCT, ARRAYFLATTEN
• D. ARRAYDISTINCT, ARRAYUNION
• E. ARRAYUNION, ARRAYDISCINT

Answer: A Explanation:
Explanation
FLATTEN -> Transforms an array of arrays into a single array.
ARRAY_DISTINCT -> The function returns an array of the same type as the input argument where all duplicate values have been removed.
Table Description automatically generated

NEW QUESTION # 174
What is the underlying technology that makes the Auto Loader work?

• A. Loader
• B. Delta Live Tables
• C. Live DataFames
• D. Structured Streaming
• E. DataFrames

Answer: D
NEW QUESTION # 175
A data architect has determined that a table of the following format is necessary:
Which of the following code blocks uses SQL DDL commands to create an empty Delta table in the above
format regardless of whether a table already exists with this name?

• A. 1. CREATE TABLE IF NOT EXISTS table_name ( id STRING, birthDate DATE, avgRating FLOAT )
• B. 1. CREATE OR REPLACE TABLE table_name
  2. WITH COLUMNS ( id STRING, birthDate DATE, avgRating FLOAT ) USING DELTA
• C. 1. CREATE TABLE table_name AS
  2. SELECT id STRING, birthDate DATE, avgRating FLOAT
• D. 1. CREATE OR REPLACE TABLE table_name AS
  2. SELECT id STRING, birthDate DATE, avgRating FLOAT USING DELTA
• E. 1. CREATE OR REPLACE TABLE table_name ( id STRING, birthDate DATE, avgRating FLOAT )

Answer: E
NEW QUESTION # 176
Data engineering team is required to share the data with Data science team and both the teams are using different workspaces in the same organizationwhich of the following techniques can be used to simplify sharing data across?
*Please note the question is asking how data is shared within an organization across multiple workspaces.

• A. Data Sharing
• B. DELTA LIVE Pipelines
• C. Unity Catalog
• D. Use a single storage location
• E. DELTA lake

Answer: C Explanation:
Explanation
The answer is the Unity catalog.
Diagram Description automatically generated

Unity Catalog works at the Account level, it has the ability to create a meta store and attach that meta store to many workspaces see the below diagram to understand how Unity Catalog Works, as you can see a metastore can now be shared with both workspaces using Unity Catalog, prior to Unity Catalog the options was to use single cloud object storage manually mount in the second databricks workspace, and you can see here Unity Catalog really simplifies that.
Diagram Description automatically generated with medium confidence

sorry for the inconvenience watermark was added because other people on Udemy are copying my questions and images.
duct features
https://databricks.com/product/unity-catalog
NEW QUESTION # 177
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