Not exactly. Given enough time and a lot of hard disk, you can put the entire 1.9B triples into any database -- that doesn't prove that it scales. Also, if the

Not exactly. Given enough time and a lot of hard disk, you can put the entire 1.9B triples into any database -- that doesn't prove that it scales. Also, if the database uses a single global mutex lock for all reads and writes, again it's not a scalable architecture. Scaling is about throughput and latency. This post is trying to determine whether adding more machine power actually lets the db perform better.