Query to Find Sessions using Temporary Tablespace (TEMP)

SELECT b.tablespace, ROUND(((b.blocks*p.value)/1024/1024),2)||'M' "SIZE", a.sid||','||a.serial# SID_SERIAL, a.username, a.program
FROM sys.v_$session a, sys.v_$sort_usage b, sys.v_$parameter p
WHERE p.name = 'db_block_size'
AND a.saddr = b.session_addr
ORDER BY b.tablespace, b.blocks;