I did a talk for Yalim Gerger on ProHuddle on the 23rd January 2018 about Oracle database vault and securing it, how it works and most importantly what can you do instead if you cannot afford it or you simply cannot install because maybe you are on Standard Edition. We look at alternative approaches and also importantly at the issue that Database Vault is an application after all and it also must be secured. Also it makes more sense to lock and secure your database with the core features of Oracle before you reply additional security features. I really like Oracle Database Vault but simply deploying it into a non secured database is not the best idea. Secure first, then deploy DV correctly and with the chosen focus and then secure DV as well!
Links to the power point slides and also a link to a recording of the live presentation are available on my Oracle Security White Papers page.