Oracle Label Security with Oracle Database 12c (White Paper)

Oracle White Paper
Oracle Label Security with Oracle Database 12c

Introduction
The need for more sophisticated controls on access to sensitive data is becoming increasingly important as organizations address emerging security requirements around data consolidation, privacy and compliance. Maintaining separate databases for highly sensitive customer data is costly and creates unnecessary administrative overhead. However, consolidating databases sometimes means combining sensitive customer data with confidential customer data.
Oracle Label Security provides the ability to tag data with a data label or a data classification. This capability allows the database to inherently know what data is sensitive and allows the sensitive data to be combined in the same table as the larger data set without compromising security. 

https://www.oracle.com/assets/label-security-wp-12c-1896140.pdf