Recommendation - Perform a Trial Upgrade
When you upgrade, applications usually work in the new environment, with little or no intervention. By running an pilot upgrade you can validate selected reports to see if the expected results are produced.
We recommend that you perform a trial upgrade several weeks before upgrading your production system. The trial upgrade identifies components that will upgrade with minimal effort, and components that may require additional actions before or after the upgrade.
Commonly, you upgrade a sample set of reports in an isolated environment, and you compare the appearance and behavior of the reports before and after the upgrade.
Ensure skilled resources are available to perform migration work, especially for mission-critical applications. Also, test and debug all applications prior to deployment.