First thing you need to do is make sure they are compatible. Use the Certifications tab in Metalink. Also, Doc #169706.1 is very helpful and you should give it to your IBM admins for them to apply extra patches, set kernel variables, etc, etc. After that, i'm sure there's a doc to relink the oracle executables, set your LD_LIBRARY_PATH or SHLIB_PATH to the right directory and run the relink_oracle. I'm sure there's a doc on metalink for that too. HTH Lyall -----Original Message----- From: Nagaraj S <nagaraj.chk@xxxxxxxxx> To: oracle-l <oracle-l@xxxxxxxxxxxxx> Sent: Tue, Oct 26, 2010 12:52 pm Subject: Oracle task after OS upgrade. Hello, We have all oracle database running on AIX 5.3. Unix team planned to upgrade AIX servers from 5.3 to 6.1 version. Please let me know what are the things I need to do from oracle side.. in other words do i need to perform any list of oracle task once the aix server upgraded to 6.1 version? Please help me, thanks in advance.