Here we describe the measures that you need to take on UNIX when your database is Oracle.
Protecting the Database Standard Users
The OPS$ Mechanism Under UNIX
Protecting the SAP Database User
Changing the Passwords for <sapsid>adm and ora<dbsid>
Access Privileges for Database-Related Resources
Setting Access Privileges for Files and Directories
Access Privileges for BR*Tools
Additional Information on Oracle with UNIX