Disable oracle direct login

Hi ,
I know how to disable direct root login. but i have to disable direct root login for oracle.i am using Red Hat Enterprise Linux Server release 5.5 (Tikanga).
Can some one help me ...
Regards,
Ani

You might want to keep in mind though that "su" will break X11 xauth authentication (ssh -X). Having to login as another user is another password layer, but does not necessarily give you more control who gets access. It depends on your password policies and the users maintaining them. It might be a good idea to be careful who receives the Oracle password. Not every access to Oracle requires the Oracle account password or SYSDBA access.

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