If it's a data warehouse system you're looking at, you may wish to consider InfiniDB. It's an Open Source columnar storage engine designed for DW type loads - it falls into the NewSQL paradigm as defined by Michael Stonebraker. There's also InfoBright, which is a similar offering.
Of course, you may not require any special software at all - vanilla MySQL on a good server may be right up your alley. As has been pointed out, 11 operations/second is not a great deal on modern (even relatively modest) servers.
Obviously, this depends on your particular queries/application, load &c. and of course, budget :-). I would urge you to evaluate solutions and test before committing to any given approach.
[EDIT]
I was thinking that I only considered MySQL related solutions. Take a look here (feature comparisons) about what's available in freebie servers from the big vendors. There's also PostgreSQL which is, in the eyes of many, a more capable DB server than MySQL.