TNS-01204

Error: TNS-01204: Unprivileged account (string) is in dba group (string)

Causa: The unprivileged account has DBA privileges. The unprivileged account specified by DEFAULT_USER_ACCOUNT in the SID_DESC in LISTENER.ORA is a member of the dba group specified by DBA_GROUP in SID_DESC. The unprivileged account cannot belong to the dba group because this would be a security violation with OPS$ logins.

Acción: Remove the unprivileged account from the dba group.