The main feature is the relational model database, where you define relationships between CIs. Being able to establish CI relationships and building a service model is a key aspect of CMDB.
The most valuable features of BMC Atrium CMDB are its ease to build new classes. For example, let's say there are types of CIs or efforts that do not exist in BMC Atrium CMDB. You can create your own and their relationship to existing classes.
