People are running petabyte-sized (1000TB) databases on SQL. One example is from Nasdaq, https://customers.microsoft.com/Pages/CustomerStory.aspx?rec...

Meanwhile, NoSQL does not mean "10s TBs of data" automatically. Check this slideshow explaining challenges of MongoDB (poster NoSQL database) "scaling to 100GB and beyond"

http://www.slideshare.net/mongodb/partner-webinar-the-scalin...