I am preparing an Oracle upgrade from 18.104.22.168 to 22.214.171.124 on a Windows 2000 environment. The server has 3 instances on it, and the possibility of upgrading them one at a time is a real one. My question is, is it OK to just run the upgrade assistant against each database one at a time, and let it worry about things like ORACLE_HOME, or is it more complicated than that?
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