Databricks Databricks-Certified-Data-Engineer-Associate 問題集

質問 1：
A data engineer has developed a data pipeline to ingest data from a JSON source using Auto Loader, but the engineer has not provided any type inference or schema hints in their pipeline. Upon reviewing the data, the data engineer has noticed that all of the columns in the target table are of the string type despite some of the fields only including float or boolean values.
Which of the following describes why Auto Loader inferred all of the columns to be of the string type?
A. JSON data is a text-based format
B. Auto Loader cannot infer the schema of ingested data
C. Auto Loader only works with string data
D. All of the fields had at least one null value
E. There was a type mismatch between the specific schema and the inferred schema
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 2：
A data engineer is running code in a Databricks Repo that is cloned from a central Git repository. A colleague of the data engineer informs them that changes have been made and synced to the central Git repository. The data engineer now needs to sync their Databricks Repo to get the changes from the central Git repository.
Which of the following Git operations does the data engineer need to run to accomplish this task?
A. Pull
B. Merge
C. Push
D. Clone
E. Commit
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 3：
Which of the following describes a benefit of creating an external table from Parquet rather than CSV when using a CREATE TABLE AS SELECT statement?
A. Parquet files have a well-defined schema
B. Parquet files can be partitioned
C. CREATE TABLE AS SELECT statements cannot be used on files
D. Parquet files have the ability to be optimized
E. Parquet files will become Delta tables
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 4：
A data engineer only wants to execute the final block of a Python program if the Python variable day_of_week is equal to 1 and the Python variable review_period is True.
Which of the following control flow statements should the data engineer use to begin this conditionally executed code block?
A. if day_of_week = 1 and review_period:
B. if day_of_week == 1 and review_period:
C. if day_of_week = 1 and review_period = "True":
D. if day_of_week = 1 & review_period: = "True":
E. if day_of_week == 1 and review_period == "True":
正解：B
解説: (Topexam メンバーにのみ表示されます)

質問 5：
A single Job runs two notebooks as two separate tasks. A data engineer has noticed that one of the notebooks is running slowly in the Job's current run. The data engineer asks a tech lead for help in identifying why this might be the case.
Which of the following approaches can the tech lead use to identify why the notebook is running slowly as part of the Job?
A. They can navigate to the Runs tab in the Jobs UI and click on the active run to review the processing notebook.
B. They can navigate to the Tasks tab in the Jobs UI to immediately review the processing notebook.
C. There is no way to determine why a Job task is running slowly.
D. They can navigate to the Tasks tab in the Jobs UI and click on the active run to review the processing notebook.
E. They can navigate to the Runs tab in the Jobs UI to immediately review the processing notebook.
正解：D
解説: (Topexam メンバーにのみ表示されます)

質問 6：
A data analyst has created a Delta table sales that is used by the entire data analysis team. They want help from the data engineering team to implement a series of tests to ensure the data is clean. However, the data engineering team uses Python for its tests rather than SQL.
Which of the following commands could the data engineering team use to access sales in PySpark?
A. spark.table("sales")
B. spark.sql("sales")
C. SELECT * FROM sales
D. There is no way to share data between PySpark and SQL.
E. spark.delta.table("sales")
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 7：
A data engineer runs a statement every day to copy the previous day's sales into the table transactions. Each day's sales are in their own file in the location "/transactions/raw".
Today, the data engineer runs the following command to complete this task:

After running the command today, the data engineer notices that the number of records in table transactions has not changed.
Which of the following describes why the statement might not have copied any new records into the table?
A. The names of the files to be copied were not included with the FILES keyword.
B. The previous day's file has already been copied into the table.
C. The COPY INTO statement requires the table to be refreshed to view the copied rows.
D. The format of the files to be copied were not included with the FORMAT_OPTIONS keyword.
E. The PARQUET file format does not support COPY INTO.
正解：B
解説: (Topexam メンバーにのみ表示されます)