Gavin Powell 
Working with Oracle GoldenGate 12c [PDF ebook] 
From Implementation to Troubleshooting

This book teaches the basics of Oracle Golden Gate, which is a product that is used to simplify the process of Oracle Database Replication. Golden Gate can be used for reporting, failover, high availability, live reporting, data warehousing, and Big Data ETL process, as well as connecting to multiple other data sources outside of Oracle Database such as SQL Server, My SQL, Teradata, Postgre SQL, and many others. The purpose of Golden Gate and its popularity is its ability to make the highly complex architecture of database replication into a much more simplistic task. This book teaches the reader how to use Oracle Golden Gate, from installation to troubleshooting.