temp tablespace usage
SELECT
 s.sid “SID”,  s.username “User”,  s.program “Program”,  u.tablespace “Tablespace”,
 u.contents “Contents”,  u.extents “Extents”,  u.blocks*8/1024 “Used Space in MB”,  q.sql_text “SQL TEXT”,
 a.object “Object”,  k.bytes/1024/1024 “Temp File Size”
FROM
v$session s, v$sort_usage u, v$access a, dba_temp_files k, v$sql q
WHERE
s.saddr=u.session_addr
and  s.sql_address=q.address
and  s.sid=a.sid
and  u.tablespace=k.tablespace_name
order by u.blocks;
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