Object databases like MongoDB and db4o are getting lots of publicity lately. Everyone that plays with them seems to love it. I\'m guessing that they are dealing with about
Here's some benchmarks on db4o:
http://www.db4o.com/about/productinformation/benchmarks/
I think it ultimately depends on a lot of factors, including the complexity of the data, but db4o seems to certainly hang with the best of them.