Hi @wiki ,
I hope you want direct access to your Adobe-hosted DB in the V8 environment so you can directly perform your ETL operations in the Adobe-managed DB without involving an adobe campaign so, it that's so then I think Adobe might not be able to provide the credentials/access to their managed DB as due to security reasons. Still want better confirmation on this decision then worth contacting your CSM (Adobe's account manager) you can help to discuss this directly with the product/provisioning team of the Adobe campaign.
Br,
Shubham