match users and role

Hello all,

I´m trying to correlate the users and the user role. To do this, I´m querying two views: DBA_USERS to get username and status and DBA_ROLE_PRIVS to get the granted role.

In the DBA_ROLE_PRIVS I´m getting some GRANTEE (users) that not correspond with USERNAME in DBA_USERS. By example,  DBA exist in DBA_ROLE_PRIVS view, but not in DBA_USERS view.

Anyone know why is this happen?

Thank you in advance.