Free Databricks Certified Data Engineer Associate Exam Databricks-Certified-Data-Engineer-Associate Exam Practice Test

Which of the following code blocks will remove the rows where the value in column age is greater than 25 from the existing Delta table my_table and save the updated table?

• SELECT * FROM my_table WHERE age > 25;
• UPDATE my_table WHERE age > 25;
• DELETE FROM my_table WHERE age > 25;
• UPDATE my_table WHERE age <= 25;
• DELETE FROM my_table WHERE age <= 25;

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?

• SELECT * FROM sales
• There is no way to share data between PySpark and SQL.
• spark.sql("sales")
• spark.delta.table("sales")
• spark.table("sales")

Which of the following commands will return the location of database customer360?

• DESCRIBE LOCATION customer360;
• DROP DATABASE customer360;
• DESCRIBE DATABASE customer360;
• ALTER DATABASE customer360 SET DBPROPERTIES ('location' = '/user'};
• USE DATABASE customer360;

Which of the following describes a scenario in which a data team will want to utilize cluster pools?

• An automated report needs to be refreshed as quickly as possible.
• An automated report needs to be made reproducible.
• An automated report needs to be tested to identify errors.
• An automated report needs to be version-controlled across multiple collaborators.
• An automated report needs to be runnable by all stakeholders.

Which of the following commands can be used to write data into a Delta table while avoiding the writing of duplicate records?

• DROP
• IGNORE
• MERGE
• APPEND
• INSERT

A data engineer wants to schedule their Databricks SQL dashboard to refresh once per day, but they only want the associated SQL endpoint to be running when it is necessary.Which of the following approaches can the data engineer use to minimize the total running time of the SQL endpoint used in the refresh schedule of their dashboard?

• They can ensure the dashboard’s SQL endpoint matches each of the queries’ SQL endpoints.
• They can set up the dashboard’s SQL endpoint to be serverless.
• They can turn on the Auto Stop feature for the SQL endpoint.
• They can reduce the cluster size of the SQL endpoint.
• They can ensure the dashboard’s SQL endpoint is not one of the included query’s SQL endpoint.

A data engineer has been using a Databricks SQL dashboard to monitor the cleanliness of the input data to an ELT job. The ELT job has its Databricks SQL query that returns the number of input records containing unexpected NULL values. The data engineer wants their entire team to be notified via a messaging webhook whenever this value reaches 100.Which of the following approaches can the data engineer use to notify their entire team via a messaging webhook whenever the number of NULL values reaches 100?

• They can set up an Alert with a custom template.
• They can set up an Alert with a new email alert destination.
• They can set up an Alert with a new webhook alert destination.
• They can set up an Alert with one-time notifications.
• They can set up an Alert without notifications.

A data engineer has a Job with multiple tasks that runs nightly. Each of the tasks runs slowly because the clusters take a long time to start.Which of the following actions can the data engineer perform to improve the start up time for the clusters used for the Job?

• They can use endpoints available in Databricks SQL
• They can use jobs clusters instead of all-purpose clusters
• They can configure the clusters to be single-node
• They can use clusters that are from a cluster pool
• They can configure the clusters to autoscale for larger data sizes

A data engineer wants to create a data entity from a couple of tables. The data entity must be used by other data engineers in other sessions. It also must be saved to a physical location.Which of the following data entities should the data engineer create?

• Database
• Function
• View
• Temporary view
• Table

Which of the following Structured Streaming queries is performing a hop from a Silver table to a Gold table?