I've seen some presentations and case studies about respectively with NuoDB.
There seem to be a potential to raise to a de-facto standard for relational cloud databases.
I have seen nothing comparable to date.

This ticket is meant to attract attention that there might be another relational SQL based database out there that promises:

• 100% SQL
• 100% ACID
• Elastic Scalability
• Built-in Redundancy
• Multi-Tenancy
• Auto Replication
• Easy Administration
• Built-in Security
• Heterogeneous Deployment

Find lots more information on the NuoDB website:
http://www.nuodb.com/

Feel free to close this ticket if that kind of technology is out of question in connection with Zabbix.