Thinking about upgrading your database to 11gR2? If so, this should help.
Is your current database release approaching the end of Premier Support?Do you wish to upgrade to a newer release that provides the longest support window?
If so, the Upgrade Planner and Upgrade Advisors can assist you with upgrade planning.
Oracle Support Upgrade Planner
The Upgrade Planner is a semi-automated way to move from one release to
another. It offers customers who use the Configuration Manager (aka the
Collector) a complete plan of all the software and patches required to
upgrade from their current release to a new release.
The Upgrade Planner uses your configuration to present a list of: