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explorer_prakash wrote:You should start with the Installation Guide
I want to upgrade oracle (for example) 10g to 11gR2 .What are the preliminary steps i should take if i'm making it manually. Can any one tell the step by step procedure?
And is their support of DBUA in 11gR2 express edition?
Which refers you to the Upgrade Guide
Here is a [url http://www.ora00600.com/articles/10g-to-11g-database-upgrade.html]step-by-step 10g to 11g upgrade guide which I have used successfully. You will need to read it in conjunction with the upgrade guides previously mentioned to make sure you don't miss out any important steps which are specific to your environment.