write-scalable, synchronous multi-master, transparent PostgreSQL cluster

 Write-scalable means Postgres-XC can be configured with as many
 database servers as you want and handle many more writes (updating SQL
 statements) compared to what a single database server can not do.
 .
 Multi-master means you can have more than one database server that
 clients connect to which provide a single, consistent cluster-wide view
 of the database.
 .
 Synchronous means any database update from any database server is
 immediately visible to any other transactions running on different
 masters.
 .
 Transparent means you (and your applications) do not have to worry
 about how your data is stored in more than one database servers
 internally.
 .
 You can configure Postgres-XC to run on multiple servers. Your data is
 stored in a distributed way, that is, partitioned or replicated, as
 chosen by you for each table. When you issue queries, Postgres-XC
 determines where the target data is stored and issues corresponding
 queries to servers containing the target data.