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下載Databricks-Certified-Professional-Data-Engineer考試題庫

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下載Databricks Certified Professional Data Engineer Exam考試題庫

NEW QUESTION 38
A data engineering team has created a series of tables using Parquet data stored in an external sys-tem. The
team is noticing that after appending new rows to the data in the external system, their queries within
Databricks are not returning the new rows. They identify the caching of the previous data as the cause of this
issue.
Which of the following approaches will ensure that the data returned by queries is always up-to-date?

• A. The tables should be altered to include metadata to not cache
• B. The tables should be refreshed in the writing cluster before the next query is run
• C. The tables should be stored in a cloud-based external system
• D. The tables should be converted to the Delta format
• E. The tables should be updated before the next query is run

Answer: D

NEW QUESTION 39
A data engineer has configured a Structured Streaming job to read from a table, manipulate the data, and then
perform a streaming write into a new table. The code block used by the data engineer is below:
1. (spark.table("sales")
2. .withColumn("avg_price", col("sales") / col("units"))
3. .writeStream
4. .option("checkpointLocation", checkpointPath)
5. .outputMode("complete")
6. ._____
7. .table("new_sales")
8.)
If the data engineer only wants the query to execute a single micro-batch to process all of the available data,
which of the following lines of code should the data engineer use to fill in the blank?

• A. .trigger(processingTime="once")
• B. .trigger(continuous="once")
• C. .trigger(once=True)
• D. .processingTime(1)
• E. .processingTime("once")

Answer: C

NEW QUESTION 40
A data engineer has developed a code block to perform a streaming read on a data source. The code block is
below:
1. (spark
2. .read
3. .schema(schema)
4. .format("cloudFiles")
5. .option("cloudFiles.format", "json")
6. .load(dataSource)
7. )
The code block is returning an error.
Which of the following changes should be made to the code block to configure the block to successfully
perform a streaming read?

• A. A new .stream line should be added after the spark line
• B. A new .stream line should be added after the .load(dataSource) line
• C. The .format("cloudFiles") line should be replaced with .format("stream")
• D. The .read line should be replaced with .readStream
• E. A new .stream line should be added after the .read line

Answer: D

NEW QUESTION 41
......