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I don't understand the difference between ORACLE_HOME and RDBMS_ORACLE_HOME in your case.
ORACLE_HOME is the generic name for directory tree where Oracle Database executables are installed.
If ORACLE_HOME is shared between your 2 cluster nodes you cannot use rolling upgrade. Here sharing means sharing by cluster nodes and not by databases: if ORACLE_HOME is only shared by some databases on same cluster node and if ORACLE_HOME is not shared by different cluster nodes then you can use rolling upgrade.
Edited by: P. Forstmann on 1 déc. 2012 11:00
Edited by: P. Forstmann on 1 déc. 2012 12:04