I agree with you here, NoSQL can't be used for everything yet, maybe one day, hyperdex + acid looks promising, we'll see. But even restricting the field back to

I agree with you here, NoSQL can't be used for everything yet, maybe one day, hyperdex + acid looks promising, we'll see. But even restricting the field back to first tier SQL based solutions, you're still talking MS SQL vs PostgreSQL, and the associated licensing fees involved in both scenarios (expensive vs free). I think performance is pretty similar between the two also last I checked. And you can setup PGSQL with a drbd failover without that much hassle. What are the licensing implications of running two windows servers with an MS SQL server failover? Do you actually need to purchase two copies for that?