SELECT * FROM V$SORT_USAGE;

USER                           SESSION_ SESSION_NU SQLADDR  SQLHASH    TABLESPACE                      CONTENTS  SEGTYPE   SEGFILE#   SEGBLK#    EXTENTS    BLOCKS     SEGRFNO#  
------------------------------ -------- ---------- -------- ---------- ------------------------------- --------- --------- ---------- ---------- ---------- ---------- ----------
SYSTEM                         0303F754        381 049B677C 1641141619 TEMPORARY_DATA                  TEMPORARY SORT            1025       1545          5        640          1