Reference
http://searchoracle.techtarget.com/tip/0,289483,sid41_gci1252556_tax306964,00.html
1) Always test upgrade procedure and post-upgrade installation on a test environment
2) Use separate ORACLE_HOME and install existing version temporarily (with temporarily modification of oracleinventory directory loc in oraInst.loc file). With a brief outage change point the running db to this new home. Now install back the binaries in original home & edit back the oraInst.loc. While the db still running using another home, install the patch on this binary. Take a brief outage start the database with this upgraded installation
3) When going for OS upgrade, if the Oracle version is not supported on the upgraded OS, first upgrade Oracle to that supported version. Then upgrade OS. Ensure the binary links are recreated.
4) Set AUDIT_TRAIL = DB
5) Create separate user for client install.
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