日期:2014-05-16  浏览次数:20516 次

如何查看oracle表空间已使用大小
1.查看所有表空间大小:
select tablespace_name,sum(bytes)/1024/1024 from dba_data_files group by tablespace_name;


2.已经使用的表空间大小:
select tablespace_name,sum(bytes)/1024/1024 from dba_free_space group by tablespace_name;


3. 所以使用空间可以这样计算:
select a.tablespace_name,total,free,total-free used from 
( select tablespace_name,sum(bytes)/1024/1024 total from dba_data_files
   group by tablespace_name) a, 
( select tablespace_name,sum(bytes)/1024/1024 free from dba_free_space
   group by tablespace_name) b
where a.tablespace_name=b.tablespace_name;