Postgres-XC is a write-scalable synchronous multi-master PostgreSQL cluster with the following features. 1) Both read and write scalability. 2) Configured with more than one server. 3) Complete global transaction and visibility management.
- Read/Write Scalability
- Symmetric (multi-master, synchronous) cluster
- Transaction management and consistent tuple visibility
- Parallel transaction execution among cluster nodes
Postgres-xc works wonderful.
Not yet mature (as of Jan 2013) but very promising.
Very good project, at last an real high availability sql server begin to exist.
Most promising scale-out PostgreSQL clusetr.