In this presentation we show how to harden the latest versions of Oracle (10g Rel.2 /11g). We talk about common architecture flaws in organizations (e.g. in Single-Home Installations) and typical security problems like database cloning, anonymisation, ... and some possible solutions. To detect changes we talk about Oracle features like Virtual Private Database (VPD), Database Trigger, ... and report these alerts via email or to syslog.