Database Manager Operator (DBM Operator) 

Users working with the database management tool Database Manager are known as Database Manager Operators. The SAP DB user class is the DBM operator.

Depending on what user authorizations the DBM operator has been given, a DBM operator is able to perform all kinds of Database Manager functions.

You create the first DBM operator when you register a database instance. When you register a new database instance, the system asks you to create a DBM operator by entering a user name and password for the DBM operator. The DBM operator’s password can be changed at a later date.

To access a new database instance after registering it, this database instance must be registered in the Database Manager under the name and password of the DBM operator.

DBM operators are not database users. You need to create database users in order to work on a database instance.