Slony-I is a "master to multiple slaves" replication system supporting cascading (e.g. - a node can feed another node which feeds another node...) and failover.
Slony-I is a "master to multiple slaves" replication system with cascading and failover. The big picture for the development of Slony-I is a master-slave system that includes all features and capabilities needed to replicate large databases to a reasonabl