Data Engineering Associate with Databricks Practice Exam

What does the DRY RUN command do when used with VACUUM?

1. Displays the total size of the database

2. Displays all files that will be deleted

3. Checks the integrity of the database

4. Lists all databases in the system

The correct answer is: Displays all files that will be deleted

The DRY RUN command, when used with VACUUM in a data management context, is designed to simulate the vacuum operation without making any actual changes to the data. This command provides insight into what files would be deleted if the VACUUM command were executed. By displaying all the files that are scheduled for deletion, the DRY RUN command allows users to understand the potential impact of the VACUUM operation and make informed decisions before proceeding with it. This feature is particularly useful for data engineers and database administrators who want to manage storage and data retention effectively while maintaining an overview of the files that could be affected. Other options do not align with the primary function of the DRY RUN command in the context of VACUUM. For instance, the total size of the database or checks on its integrity involves different commands or methodologies and would not be addressed by the DRY RUN functionality. Similarly, listing all databases is entirely separate from the purpose of assessing deletable files within a specific database context during a vacuum operation.