Oracle has a distributed transaction system that&#x27;ll work cross-country, but I can&#x27;t find the details. It&#x27;s basically a complete rip-off of the OpenVMS implementation from the late 70s (or whenever all those VAX&#x2F;VMSstations came out - post PDP), no surprises there, and it costs an insane amount just for that functionality (separate from RAC), but it works <i>really well</i>. I&#x27;m trying to find the docs since it&#x27;s been more than half a decade since I used it but [1] is the closest I can get (and that&#x27;s certainly not it, though RAC does it&#x27;s job quite well also and that page is worth a read if only for exposing yourself to time-tested transactional models.) It might be HA-NFS over ACFS but that doesn&#x27;t seem quite right to me. Anyways, read section 5 of this[2] Oracle doc, to have a master-class on maintaining database integrity across the datacenter or across the country. I&#x27;ve used a litany of DBs and I think I wouldn&#x27;t pick anything made in the last 10 years for my primary store other than Datomic (which I&#x27;ve beaten into the ground as hard as I could and it took my abuse) and or maybeeee VoltDB (if only because Stonebraker is DJB-level smart).<p>[1] <a href="http:&#x2F;&#x2F;docs.oracle.com&#x2F;cd&#x2F;B28359_01&#x2F;server.111&#x2F;b28318&#x2F;consist.htm#i5338" rel="nofollow">http:&#x2F;&#x2F;docs.oracle.com&#x2F;cd&#x2F;B28359_01&#x2F;server.111&#x2F;b28318&#x2F;consis...</a>