oracle 查看表空间使用比

select b.file_name 物理文件名,
       b.tablespace_name 表空间,
       b.bytes /  /  大小M,
       (b.bytes - sum(nvl(a.bytes, ))) /  /  已使用M,
       substr((b.bytes - sum(nvl(a.bytes, ))) / (b.bytes) * , , ) 利用率
  from dba_free_space a, dba_data_files b
 where a.file_id = b.file_id
 group by b.tablespace_name, b.file_name, b.bytes
 order by b.tablespace_name

select Upper(f.tablespace_name) "表空间名",

       d.tot_grootte_mb "表空间大小(M)",

       　 　d.tot_grootte_mb - f.total_bytes "已使用空间(M)",

       to_char(round((d.tot_grootte_mb - f.total_bytes) /

                     d.tot_grootte_mb * ,
                     ),
               '990.99') || '%' "使用比",

       　 f.total_bytes "空闲空间(M)",

       　　f.max_bytes "最大块(M)"

  from (select tablespace_name,

               round(sum(bytes) / ( * ), ) total_bytes,

               round(max(bytes) / ( * ), ) max_bytes

          from sys.dba_free_space

         group by tablespace_name) f,

       (select dd.tablespace_name,

               round(sum(dd.bytes) / ( * ), ) tot_grootte_mb

          from sys.dba_data_files dd

         group by dd.tablespace_name) d

 where d.tablespace_name = f.tablespace_name

 order by f.tablespace_name;