DirectQuery and the SQL Server requirement of Report Server

Hi,

I'm relatively new to Power BI and would like to clarify something.

I understand from the Hardware and Software requirements and the installation guide that a SQL Server is required to install/ configure Power BI Report Server. I also understand, than when DirectQuery is used as opposed to Import, the underlying data source (in my case, on-premises Oracle DB) is queried when reports and visuals are rendered. The data would not reside in the SQL Server.

My question is: would I still need a SQL Server if I only used DirectQuery for a direct connection to my Oracle DB? (no Import)