I am doing a Db (Oracle and Db2) Audit and Protection project, digging into this topic I found that there are no so many out-of-the-box & plug-play solutions. However I am lucky that we have acquired Guardium, this is a really cool technology, it includes an appliance, so customers has not to worry about impacting their production system. Great stuff, have a look at http://www.guardium.com/