PostgreSQL has a matrix of different high availability options which represent many different ways of building replication into an RDBMS.

Here is the [PostgreSQL High Availability, Load Balancing, and Replication Feature Matrix](http://www.postgresql.org/docs/current/interactive/different-replication-solutions.html#HIGH-AVAILABILITY-MATRIX) 

Questions

* Which of the approaches in the PostgreSQL High Availability Matrix are supported by Oracle?
* Does oracle do high availability with techniques that are not available with PostgreSQL?