Silly us. The engineers at Google and Amazon also don't know what they're doing either. They should go back to computer science class and let the big boys and SQL Server run the shop.
It's a different problem. I can get a database that holds 30 GB, although I suspect the actual DB was much larger. I can't get a database that holds >PB.
Wow, did the article say somewhere that Google and Amazon don't know what they're doing? I don't believe it did. In fact I think it quite specifically questioned some performance claims that aren't valid.