May depend on your workload and what you mean by 'distributed'... there are some scalablleity options for postrgres. There are backend drivers for Oracle and M

May depend on your workload and what you mean by 'distributed'... there are some scalablleity options for postrgres. There are backend drivers for Oracle and MS SQL as well, but I have never used either and I'm not sure just how good they are. But there is nothing that I am aware of inherent to the ORM itself that prevent horizontal scale.