Data retention policies are not necessary for compliance with GDPR and other regulatory requirements, as Azure Databricks automatically handles all data retention needs.

Data retention policies can be implemented by manually tracking the age of data and deleting it once it exceeds the 7-year limit, without the need for automation.

Data retention policies can be implemented by setting data expiration rules based on the creation or modification date of the data and automating the deletion process to ensure data is retained within the required 5 to 7-year window.

Data retention policies are only applicable to non-sensitive data and do not need to be implemented for sensitive customer data stored in Azure Databricks.