oracle查看表空间使用情况

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;

4. 下面这条语句查看所有segment的大小。
Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name

5. 还有在命令行情况下如何将结果放到一个文件里。
spool out.txt
select * from v$database;
spool off