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Find users with DBA privilege

If you wish to know which users have been granted the dba role then you need to query the dba_role_privs in the SYS schema.
This role tells you the grantee, granted_role, whether they have admin option granted, and whether the role is their default role:
SQL> desc dba_role_privs
Name         Null?    Type
------------ -------- ------------
GRANTEE               VARCHAR2(30)
GRANTED_ROLE NOT NULL VARCHAR2(30)
ADMIN_OPTION          VARCHAR2(3)
DEFAULT_ROLE          VARCHAR2(3)
To find a list of all users with DBA privilege execute the following code:
SQL> select * from dba_role_privs where granted_role='DBA';
GRANTEE   GRANTED_ROLE ADM DEF
--------- ------------ --- ---
SYS       DBA          YES YES
SYSTEM    DBA          YES YES

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