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Databricks-Certified-Professional-Data-Engineer Exam Pass Guide - Valid Databricks-Certified-Professional-Data-Engineer Test Sims

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Databricks Databricks-Certified-Professional-Data-Engineer certification is a valuable credential for professionals working with big data and data engineering. Databricks Certified Professional Data Engineer Exam certification validates the candidates’ technical skills in working with big data projects implemented on the Databricks platform. It aims to create a standard for big data engineering skills and provides a valuable addition to a candidate's resume. Earning this certification opens up doors for career advancement and can improve a professional's ability to secure a high-paying job in the big data industry.

The Databricks Databricks-Certified-Professional-Data-Engineer Exam consists of multiple-choice questions and hands-on tasks that test the candidate's practical knowledge of Databricks. Databricks-Certified-Professional-Data-Engineer exam covers a wide range of topics such as data engineering, data processing, ETL, data modeling, data warehousing, data governance, and data security. Databricks-Certified-Professional-Data-Engineer exam is designed to evaluate the candidate's ability to design and implement scalable data pipelines using Databricks.

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Databricks Certified Professional Data Engineer Exam Sample Questions (Q18-Q23):

NEW QUESTION # 18
Which statement describes Delta Lake Auto Compaction?

A. Data is queued in a messaging bus instead of committing data directly to memory; all data is committed from the messaging bus in one batch once the job is complete.
B. An asynchronous job runs after the write completes to detect if files could be further compacted; if yes, an optimize job is executed toward a default of 1 GB.
C. Before a Jobs cluster terminates, optimize is executed on all tables modified during the most recent job.
D. Optimized writes use logical partitions instead of directory partitions; because partition boundaries are only represented in metadata, fewer small files are written.
E. An asynchronous job runs after the write completes to detect if files could be further compacted; if yes, an optimize job is executed toward a default of 128 MB.

Answer: E

Explanation:
This is the correct answer because it describes the behavior of Delta Lake Auto Compaction, which is a feature that automatically optimizes the layout of Delta Lake tables by coalescing small files into larger ones.
Auto Compaction runs as an asynchronous job after a write to a table has succeeded and checks if files within a partition can be further compacted. If yes, it runs an optimize job with a default target file size of 128 MB.
Auto Compaction only compacts files that have not been compacted previously. Verified References:
[Databricks Certified Data Engineer Professional], under "Delta Lake" section; Databricks Documentation, under "Auto Compaction for Delta Lake on Databricks" section.
"Auto compaction occurs after a write to a table has succeeded and runs synchronously on the cluster that has performed the write. Auto compaction only compacts files that haven't been compacted previously."
https://learn.microsoft.com/en-us/azure/databricks/delta/tune-file-size

NEW QUESTION # 19
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 = dbutils.notebooks.getParam("date")
B. import sys
date = sys.argv[1]
C. dbutils.widgets.text("date", "null") date = dbutils.widgets.get("date")
D. input_dict = input()
date= input_dict["date"]
E. date = spark.conf.get("date")

Answer: C

Explanation:
Explanation
The code block that should be used to create the date Python variable used in the above code block is:
dbutils.widgets.text("date", "null") date = dbutils.widgets.get("date") This code block uses the dbutils.widgets API to create and get a text widget named "date" that can accept a string value as a parameter1. The default value of the widget is "null", which means that if no parameter is passed, the date variable will be "null". However, if a parameter is passed through the Databricks Jobs API, the date variable will be assigned the value of the parameter. For example, if the parameter is "2021-11-01", the date variable will be "2021-11-01". This way, the notebook can use the date variable to load data from the specified path.
The other options are not correct, because:
Option A is incorrect because spark.conf.get("date") is not a valid way to get a parameter passed through the Databricks Jobs API. The spark.conf API is used to get or set Spark configuration properties, not notebook parameters2.
Option B is incorrect because input() is not a valid way to get a parameter passed through the Databricks Jobs API. The input() function is used to get user input from the standard input stream, not from the API request3.
Option C is incorrect because sys.argv1 is not a valid way to get a parameter passed through the Databricks Jobs API. The sys.argv list is used to get the command-line arguments passed to a Python script, not to a notebook4.
Option D is incorrect because dbutils.notebooks.getParam("date") is not a valid way to get a parameter passed through the Databricks Jobs API. The dbutils.notebooks API is used to get or set notebook parameters when running a notebook as a job or as a subnotebook, not when passing parameters through the API5.
References: Widgets, Spark Configuration, input(), sys.argv, Notebooks

NEW QUESTION # 20
At the end of the inventory process, a file gets uploaded to the cloud object storage, you are asked to build a process to ingest data which of the following method can be used to ingest the data in-crementally, schema of the file is expected to change overtime ingestion process should be able to handle these changes automatically.
Below is the auto loader to command to load the data, fill in the blanks for successful execution of below code.
1.spark.readStream
2..format("cloudfiles")
3..option("_______","csv)
4..option("_______", 'dbfs:/location/checkpoint/')
5..load(data_source)
6..writeStream
7..option("_______",' dbfs:/location/checkpoint/')
8..option("_______", "true")
9..table(table_name))

A. cloudfiles.format, checkpointlocation, cloudfiles.schemalocation, overwrite
B. format, checkpointlocation, schemalocation, overwrite
C. cloudfiles.format, cloudfiles.schemalocation, checkpointlocation, mergeSchema
D. cloudfiles.format, cloudfiles.schemalocation, checkpointlocation, overwrite
E. cloudfiles.format, cloudfiles.schemalocation, checkpointlocation, append

Answer: C

Explanation:
Explanation
The answer is cloudfiles.format, cloudfiles.schemalocation, checkpointlocation, mergeSchema.
Here is the end to end syntax of streaming ELT, below link contains complete options Auto Loader options | Databricks on AWS
1.spark.readStream
2..format("cloudfiles") # Returns a stream data source, reads data as it arrives based on the trigger.
3..option("cloudfiles.format","csv") # Format of the incoming files
4..option("cloudfiles.schemalocation", "dbfs:/location/checkpoint/") The location to store the inferred schema and subsequent changes
5..load(data_source)
6..writeStream
7..option("checkpointlocation","dbfs:/location/checkpoint/") # The location of the stream's checkpoint
8..option("mergeSchema", "true") # Infer the schema across multiple files and to merge the schema of each file. Enabled by default for Auto Loader when inferring the schema.
9..table(table_name)) # target table

NEW QUESTION # 21
Which of the following technologies can be used to identify key areas of text when parsing Spark Driver log4j output?

A. Regex
B. C++
C. pyspsark.ml.feature
D. Scala Datasets
E. Julia

Answer: A

Explanation:
Regex, or regular expressions, are a powerful way of matching patterns in text. They can be used to identify key areas of text when parsing Spark Driver log4j output, such as the log level, the timestamp, the thread name, the class name, the method name, and the message. Regex can be applied in various languages and frameworks, such as Scala, Python, Java, Spark SQL, and Databricks notebooks. References:
* https://docs.databricks.com/notebooks/notebooks-use.html#use-regular-expressions
* https://docs.databricks.com/spark/latest/spark-sql/udf-scala.html#using-regular-expressions-in-udfs
* https://docs.databricks.com/spark/latest/sparkr/functions/regexp_extract.html
* https://docs.databricks.com/spark/latest/sparkr/functions/regexp_replace.html

NEW QUESTION # 22
A table is registered with the following code:

Bothusersandordersare Delta Lake tables. Which statement describes the results of queryingrecent_orders?

A. All logic will execute when the table is defined and store the result of joining tables to the DBFS; this stored data will be returned when the table is queried.
B. The versions of each source table will be stored in the table transaction log; query results will be saved to DBFS with each query.
C. All logic will execute at query time and return the result of joining the valid versions of the source tables at the time the query finishes.
D. All logic will execute at query time and return the result of joining the valid versions of the source tables at the time the query began.
E. Results will be computed and cached when the table is defined; these cached results will incrementally update as new records are inserted into source tables.

Answer: A

NEW QUESTION # 23
......

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