You may be surprised how both extensive and fine grained the constraints you mention can be with current high-end RDBMS. And yes, that includes stuff like high

You may be surprised how both extensive and fine grained the constraints you mention can be with current high-end RDBMS. And yes, that includes stuff like high availability and blobs/filesystems. (via naked POSIX API? Why the hell would you do that?) Though - cheap shots be damned - in my experience "high-end RDBMS" don't include (Non-Enterprise) MySQL or - to a certain extent - Postgres.