Out-of-place patching
A new mechanism for patching has been provided in the Enterprise Manager Cloud Control 12c version, known as out-of-place patching. This is now the recommended method and creates a new Oracle home which is then patched while the previous home is still operational. All this is done using an out of the box deployment procedure in Enterprise Manager.
Using this mechanism means that the only downtime will take place when the databases from the previous home are switched to run from the new home. If there is any issue with the database patch, you can switch back to the previous unpatched home since it is still available. So, patch rollback is a lot faster.
Also, if there are multiple databases running in the previous home, you can ...
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