Usage of the temp tablespace in Oracle

First find the block size:

select value "BLOCK_SIZE"
from v$parameter
where name='db_block_size' ;

Now check the usage of the tablespace:

s.username "USER",s.sid,s.osuser,
u.tablespace "TS" ,
sum(u.blocks) * &BLOCK_SIZE./1024/1024 MB,
from v$session s,v$sort_usage u,v$sqltext x
where s.saddr=u.session_addr
and s.sql_address=x.address
group by
s.sid, s.username, osuser,
tablespace, sql_text, address, piece
order by sid, piece asc;

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