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Databricks Certified Data Engineer Associate Exam Sample Questions (Q302-Q307):

NEW QUESTION # 302
A data engineer ingests semi-structured JSON logs into a Delta table using Auto Loader with schema evolution enabled. A new string field userAgent appears in the JSON. What happens to the new userAgent field?

A. The new userAgent field is silently ignored, and its data is dropped for all new files.
B. All existing data is backfilled with a default value for userAgent and made non-nullable.
C. The new userAgent field is added as a new nullable column in the Delta table, populated for new data.
D. Ingestion fails with a schema-mismatch error until the table is altered.

Answer: C

Explanation:
With schema evolution enabled, Auto Loader adds userAgent as a nullable column. Existing rows have NULL, while new records populate the field when present.

NEW QUESTION # 303
Which of the following describes the storage organization of a Delta table?

A. Delta tables are stored in a collection of files that contain only the data stored within the table.
B. Delta tables store their data in a single file and all metadata in a collection of files in a separate location.
C. Delta tables are stored in a single file that contains data, history, metadata, and other attributes.
D. Delta tables are stored in a collection of files that contain data, history, metadata, and other attributes.
E. Delta tables are stored in a single file that contains only the data stored within the table.

Answer: D

Explanation:
Delta Lake is the optimized storage layer that provides the foundation for storing data and tables in the Databricks lakehouse. Delta Lake is open source software that extends Parquet data files with a file-based transaction log for ACID transactions and scalable metadata handling1. Delta Lake stores its data and metadata in a collection of files in a directory on a cloud storage system, such as AWS S3 or Azure Data Lake Storage2. Each Delta table has a transaction log that records the history of operations performed on the table, such as insert, update, delete, merge, etc. The transaction log also stores the schema and partitioning information of the table2. The transaction log enables Delta Lake to provide ACID guarantees, time travel, schema enforcement, and other features1. References:
* What is Delta Lake? | Databricks on AWS
* Quickstart - Delta Lake Documentation

NEW QUESTION # 304
A data engineer needs to parse only png files in a directory that contains files with different suffixes. Which code should the data engineer use to achieve this task?

Answer: A

NEW QUESTION # 305
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. org.apache.spark.sql.jdbc
B. autoloader
C. sqlite
D. DELTA
E. org.apache.spark.sql.sqlite

Answer: A

Explanation:
Explanation
CREATE TABLE new_employees_table
USING JDBC
OPTIONS (
url "<jdbc_url>",
dbtable "<table_name>",
user '<username>',
password '<password>'
) AS
SELECT * FROM employees_table_vw
https://docs.databricks.com/external-data/jdbc.html#language-sql

NEW QUESTION # 306
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 USAGE ON DATABASE customers TO team;
B. GRANT SELECT CREATE MODIFY USAGE PRIVILEGES ON DATABASE customers TO team;
C. GRANT ALL PRIVILEGES ON DATABASE customers TO team;
D. GRANT ALL PRIVILEGES ON DATABASE team TO customers;
E. GRANT SELECT PRIVILEGES ON DATABASE customers TO teams;

Answer: C

Explanation:
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.

NEW QUESTION # 307
......

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