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Slony-I is a "master to multiple slaves" replication system with cascading and failover. Slony-I is a system designed for use at data centers and backup sites, where the normal mode of operation is that all nodes are available.
DBBalancer is some sort of middleware that would sit in between of database clients and a server. Currently the only server supported is Postgres, but the architecture is open to embrace more servers in a future. It's a connection pool, a load balancer and a database replicator.
Postgres-XL is a horizontally scalable open source SQL database cluster, flexible enough to handle varying database workloads like OLTP, Business Intelligence requiring MPP parallelism, Key value store, GIS Geospatial and lot more.