SharePoint 2013 Site Collection Upgrade

Hi,

I have kicked off the Site Collection upgraded in SharePoint 2013 on a site which has a content DB 0f around 23GB.. The process has been running for almost two days now, and we have just been informed that the site collection upgrade is no longer required i.e. the site can remain in SharePoint 2010 mode.

What is the easiest way to stop the process?

I was thinking of just removing the content db...

Thanks,