PerForce is commercial SCM? solution. Based on a RelationalDataBase model, it claims to be faster than other SCM?s for large SourceCode bases.
The FreeBSD Foundation uses PerForce to provide development branches for individual developers and projects because it "can track multiple separate long-lived works-in-progress and collaborate between multiple developers at the same time on the same change set."
2 pages link to PerForce:
