SQL Server Management use paginating, else it will take for ever and use a lot of ram.
You will need to do the same in openrpa if you want to load that much data. ( and i cannot think of a single use case where that would be a good idea, if the data is already in a database, then why not use it ? )
Can you explain what you are trying to do, so we can help you find a better solution ?
There is no premiun version of openrpa. Everything is out there as open source.
The Premiun license mention on the website is for openflow and is only related to scaling, reporing, monitoring and better SLA on support.