I recently installed Nintex and today I started experimenting with NWAdmin.exe. When running nwadmin.exe -o PurgeFlowData -state .... I got the response: Failed to open a connection to a Nintex Workflow content database. This is correct, because after installation only the account which runs the SharePoint web application pool has permissions on the database (the wss_Content_Application_Pools database role).
I do not manage our SQL environment and have to request permissions on the Nintex content databases. However, what should they be? And should there be additional permissions for the configuration database? We aim to have no more permissions than required. I could not find any documentation about this and any help would be greatly appreciated!