Originally from a development background, John P Jeffries has worked for Oracle Corporation since the Siebel acquisition in 2005. His time at Siebel was spent developing ETL solutions for Data Warehouses, later moving to Oracle Consulting and then Oracle Advanced Customer Services as a Senior Principal Consultant, earning the internal title of "The UK's Data Replication Expert". Now a freelance consultant, he can be found onsite in many of the world's most respected financial institutions in London, consulting on Oracle GoldenGate, Streams, and Active Data Guard. With over 15 years of Oracle experience, and an OCP since Oracle 8i, he has extensive knowledge of Oracle databases, including Enterprise Linux and RAC, coupled with the ability to design and build high-performance distributed database systems. He has trained internal and external clients in Data Warehousing and Data Replication techniques, and continues to share his knowledge and experience through his own Website: http://www.oracle11ggotchas.com.