Hi @cheerwthraj, 

To connect Tableau to Databricks and refresh extracts, you can use either OAuth or service principal authentication.

For best practices, please refer to the below link,

https://docs.databricks.com/en/partners/bi/tableau.html#best-practices-and-troubleshooting

For more details:-

Connecting Tableau and Databricks:- 

AWS:- https://docs.databricks.com/en/partners/bi/tableau.html#best-practices-and-troubleshooting

Azure:- https://learn.microsoft.com/en-us/azure/databricks/partners/bi/tableau

GCP:- https://docs.gcp.databricks.com/en/partners/bi/tableau.html

Can I access Tableau with Service Principal by OAuth, or I have to created PAT?