oralce顯示tablespace使用情況的sql

--自己做個記號

select a.tablespace_name,a.bytes bytes_used,b.largest,round(((a.bytes - b.bytes)/a.bytes)*100,2) percent_used
from
(select tablespace_name ,sum(bytes) bytes from dba_data_files group by tablespace_name) a ,
(select tablespace_name,sum(bytes) bytes ,max(bytes) largest from dba_free_space group by tablespace_name) b
where a.tablespace_name = b.tablespace_name
order by ((a.bytes-b.bytes)) desc