Oracle查看表空间大小和 使用率 （DBA 给的）

select  sysdate,c.tablespace_name,round(used_mb,1),round(total_mb,1),round(used_mb/total_mb,3)*100||'%' from

(select tablespace_name, sum(bytes)/1024/1024 used_mb from dba_segments group by tablespace_name) a,

(select tablespace_name,SUM(case autoextensible  when 'YES' THEN

              CASE WHEN maxbytes > bytes THEN maxbytes ELSE bytes END

              ELSE bytes END)/1024/1024 total_mb

from dba_data_files group by tablespace_name) b,

dba_tablespaces c

where c.tablespace_name = b.tablespace_name

and c.tablespace_name=a.tablespace_name(+)

and c.contents = 'PERMANENT'

and c.tablespace_name not like '%UNDO%'

order by used_mb/total_mb;