Operating system security for the oracle database
A paper written as a companion for my presentation ‘Oracle security done right’, which will be presented at the Slovenian International Oracle User Group (SIOUG), and at the UKOUG has been put on technet in the security section: http://www.oracle.com/technology/deploy/security/index.html
If you are interested in enhancing security on linux/unix based systems and making DBA usage audit-able, fetch the paper. Of course, any comments are appreciated!