Planning a database migration/upgrade entails numerous issues that require close attention. The most common issue is system downtime. Accounting for the possibility of extended system downtimes and failback options in the event of problems is an essential part of migration and upgrade planning. The best practices introduced in this document address these issues. This white paper discusses the procedures for upgrading your Oracle database,— particularly focusing on using Oracle’s real-time data integration software, Oracle GoldenGate— along with the results of such upgrades.