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Databricks Databricks-Certified-Data-Engineer-Associate試験関連情報 & Databricks-Certified-Data-Engineer-Associate受験体験
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Databricks Databricks-Certified-Data-Engineer-Associate 認定試験の出題範囲:
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Databricks Certified Data Engineer Associate Exam 認定 Databricks-Certified-Data-Engineer-Associate 試験問題 (Q15-Q20):
質問 # 15
Which of the following commands can be used to write data into a Delta table while avoiding the writing of duplicate records?
- A. IGNORE
- B. MERGE
- C. DROP
- D. APPEND
- E. INSERT
正解:B
解説:
The MERGE command can be used to upsert data from a source table, view, or DataFrame into a target Delta table. It allows you to specify conditions for matching and updating existing records, and inserting new records when no match is found. This way, you can avoid writing duplicate records into a Delta table1. The other commands (DROP, IGNORE, APPEND, INSERT) do not have this functionality and may result in duplicate records or data loss234. Reference: 1: Upsert into a Delta Lake table using merge | Databricks on AWS 2: SQL DELETE | Databricks on AWS 3: SQL INSERT INTO | Databricks on AWS 4: SQL UPDATE | Databricks on AWS
質問 # 16
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. CREATE TABLE AS SELECT statements cannot be used on files
- C. Parquet files can be partitioned
- D. Parquet files will become Delta tables
- E. Parquet files have the ability to be optimized
正解:A
解説:
Explanation
https://www.databricks.com/glossary/what-is-parquet#:~:text=Columnar%20storage%20like%20Apache%20Par Columnar storage like Apache Parquet is designed to bring efficiency compared to row-based files like CSV.
When querying, columnar storage you can skip over the non-relevant data very quickly. As a result, aggregation queries are less time-consuming compared to row-oriented databases.
質問 # 17
A data engineer needs to create a table in Databricks using data from their organization's existing SQLite database.
They run the following command:
Which of the following lines of code fills in the above blank to successfully complete the task?
- A. sqlite
- B. org.apache.spark.sql.jdbc
- C. org.apache.spark.sql.sqlite
- D. DELTA
- E. autoloader
正解:A
解説:
In the given command, a data engineer is trying to create a table in Databricks using data from an SQLite database. The correct option to fill in the blank is "sqlite" because it specifies the type of database being connected to in a JDBC connection string. The USING clause should be followed by the format of the data, and since we are connecting to an SQLite database, "sqlite" would be appropriate here. References:
* Create a table using JDBC
* JDBC connection string
* SQLite JDBC driver
質問 # 18
A new data engineering team team. has been assigned to an ELT project. The new data engineering team will need full privileges on the database customers to fully manage the project.
Which of the following commands can be used to grant full permissions on the database to the new data engineering team?
- A. GRANT SELECT CREATE MODIFY USAGE PRIVILEGES ON DATABASE customers TO team;
- B. GRANT USAGE ON DATABASE customers TO team;
- C. GRANT ALL PRIVILEGES ON DATABASE team TO customers;
- D. GRANT ALL PRIVILEGES ON DATABASE customers TO team;
- E. GRANT SELECT PRIVILEGES ON DATABASE customers TO teams;
正解:D
解説:
Explanation
To grant full privileges on the database "customers" to the new data engineering team, you can use the GRANT ALL PRIVILEGES command as shown in option E. This command provides the team with all possible privileges on the specified database, allowing them to fully manage it.
質問 # 19
Which of the following Git operations must be performed outside of Databricks Repos?
- A. Commit
- B. Push
- C. Clone
- D. Pull
- E. Merge
正解:C
質問 # 20
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