DBM operators (Database Manager operators) can manage databases using Database Studio and Database Manager CLI.
DBM operators have a set of DBM server permissions, which determine the administration tasks they can carry out. The database system administrator is a special DBM operator with all DBM server permissions.
The default value for the name of the first DBM operator is DBM, in SAP systems CONTROL.
Database Administration, DBM Operators, Database System Administrator
Database Manager CLI, Managing Database Manager Operators
Database Administration in CCMS, User Data, DBM Operator
SAP MaxDB Security Guide, User Administration and Authentication, Authorizations
SAP note 1542818