Oracle Data Guard Overview

Data Guard and Data Broker overview.

https://oracle-base.com/articles/11g/data-guard-setup-using-broker-11gr2

https://gjilevski.files.wordpress.com/2010/12/rac-data-guard-setup-and-management-with-oracle-11gr2.pdf

http://andrewfraserdba.com/wp-content/uploads/2011/08/Oracle-Data-Guard-Overview.pdf