如何查看oracle表空间已使用大小

Question

如何查看oracle表空间已使用大小

Answer 1

1. 查看所有表空间大小SQL> select tablespace_name,sum(bytes)/1024/1024 from dba_data_files2 group by tablespace_name;2. 已经使用的表空间大小SQL> select tablespace_name,sum(bytes)/1024/1024 from dba_free_space2 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_filesgroup by tablespace_name) a,( select tablespace_name,sum(bytes)/1024/1024 free from dba_free_spacegroup by tablespace_name) bwhere 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_Name5. 还有在命令行情况下如何将结果放到一个文件里。SQL> spool out.txtSQL> select * from v$database;SQL> spool off