Data Engineering Associate with Databricks Practice Exam

What occurs when you perform a Time Travel query on a Delta table?

1. You retrieve the current version of the data

2. You access a previous version of the data

3. You delete the current version of the data

4. You create a snapshot of the data

The correct answer is: You access a previous version of the data

Performing a Time Travel query on a Delta table allows you to access a previous version of the data. Delta Lake maintains a transaction log that records every change made to a table, allowing users to query historical data effortlessly. This capability is particularly useful for auditing, debugging, or reverting to a previous state of the data without needing to create separate backups or copies. By specifying a timestamp or a version number in the Time Travel query, users can retrieve and analyze data as it existed at that specific point in time. This flexibility is one of the key advantages of using Delta Lake within the data engineering workflow, allowing for enhanced data governance and reliability.