See the following links to versions of the Ranger Database Schema:
Ranger v2.0.0 : https://cwiki.apache.org/confluence/display/RANGER/Ranger+2.0.0+Database+Schema
Ranger v2.1.0 : https://cwiki.apache.org/confluence/display/RANGER/Ranger+2.1.0+Database+Schema
Ranger v2.2.0 : https://cwiki.apache.org/confluence/display/RANGER/Ranger+2.2.0+Database+Schema
