Gavin Powell is a professional database subject matter expert with 30 years’ experience as an IT professional, working in fields such as database architecture, operational administration, performance tuning, troubleshooting teaching, data warehousing, leadership, and development. Gavin has also built and run a small software business creating accounting software.Gavin has authored the following books: Working with Oracle GoldenGate 12cDatabase Modeling Step by StepOracle SQL Jumpstart with Examples (with Carol McCullough-Dieter)Oracle Performance Tuning for 109RzOracle Data Warehouse Tuning for 10gR2