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SELECT b.tablespace,
       ROUND(((b.blocks*p.value)/1024/1024),2)||'M' AS temp_size,
       a.inst_id as Instance,
       a.sid||','||a.serial# AS sid_serial,
       NVL(a.username, '(oracle)') AS username,
       a.sid,
       a.serial#,
       a.program,
       a.status,
       a.sql_id
FROM   gv$session a,
       gv$sort_usage b,
       gv$parameter p
WHERE  p.name  = 'db_block_size'
AND    a.saddr = b.session_addr
AND    a.inst_id=b.inst_id
AND    a.inst_id=p.inst_id
ORDER BY b.tablespace, b.blocks