as far as i know oracle has the "DATA VAULT" feature.so has sql server?if it has,give me an information link about that feature please.
* Preventing highly privileged users (DBA) from accessing application data
* Enforcing separation of duty
* Providing controls over who, when, where and how applications, data and databases can be accessed.
http://www.oracle.com/technology/deploy/security/database-security/database-vault/index.html