To obtain a checklist of tasks you must complete before upgrading an Oracle Database on a physical server or virtual machine, run the Pre-Upgrade Information Tool (preupgrade.jar).

Before starting your upgrade, ensure that you have a new release Oracle Database installed and configured that you can use as the target for your upgrade. When your target Oracle Database home is prepared, then run the Pre-Upgrade Information Tool (preupgrade.jar) on your system, using the instructions that you can find in this guide.

Oracle requires that you run the Pre-Upgrade Information Tool before you upgrade Oracle Database. The tool can identify issues for you to address before you start your upgrade. In certain cases, the tool can also resolve some of them.