I had a great response to my question on how to quickly delete WF history in this post
I have 3 follow-up questions
1- When I go to NintexWorkflowHistory and select Purge items. I get a correlation ID error Upon further review it does appear to delete about 7,500 each time I select Purge Items, but no more Somewhat of a drag when I have 50,000 History items. Any idea for the error ? Note I tried another list and same thing - i get an error and it deletes 7,500 at a time.
2-A casualty of doing the above is then my Recycle Bin fills up ! How do I mass delete the Recycle Bin ?
3-How do I prevent WF History getting created in the first place ? When I go to the Site Workflow and select WF Settings there is no option to prevent a WF history under the drop-down called "History List"