cdfixed.sql:create or replace view gv_$transaction as select * from gv$transaction;

SQL> select segment_id, tablespace_name, owner, segment_name, status from dba_rollback_segs where TABLESPACE_NAME='UNDOTBS1' and status='ONLINE';

SEGMENT_ID TABLESPACE_NAME                OWNER  SEGMENT_NAME
---------- ------------------------------ ------ ------------------------------
STATUS
----------------
        17 UNDOTBS1                       PUBLIC _SYSSMU17_3660777150$
ONLINE


select count(*) cnt
  from x$ktcxb
 --where bitand(ksspaflg, 1) != 0
  -- and bitand(ktcxbflg, 2) != 0
  5    where kxidusn = 17;

       CNT
----------
         0