Upgrading to Oracle Database 12c provides the latest in efficient, reliable, secure data management for mission-critical on-line transaction processing applications, query-intensive data warehouses, and cloud applications. The right planning, preparation, and upgrade steps will make the upgrade process simpler, faster, and more predictable from start to finish.
Wondering which prior releases are supported for direct upgrade to Oracle Database 12c? Check out the Database Server Upgrade/Downgrade Compatibility Matrix.
If you plan on using the Oracle Database Upgrade Assistant (DBUA) to perform your upgrade, the Complete Checklist for Upgrading to Oracle Database 12c Release 1 using DBUA (Doc ID 1516557.1) provides a check list for review prior to performing an automated upgrade.
If you are planning a manual upgrade, the Complete Checklist for Manual Upgrades to Oracle Database 12c Release 1 (Doc ID 1503651.1) provides a check list for review prior to performing a manual upgrade.