Verifying System Readiness for Oracle Database Upgrades
Use Cluster Verification Utility (CVU) to assist you with system checks in preparation for starting a database upgrade.
The installer runs the appropriate CVU checks automatically, and either prompts you to fix problems, or provides a fixup script to be run on all nodes in the cluster before proceeding with the upgrade.
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Parent topic: Using CVU to Validate Readiness for Oracle RAC Upgrades