oracle实用语句集锦

1.查看oracle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.查看已使用表空间大小

select tablespace_name,sum(bytes)/1024/1024 from dba_free_space group by tablespace_name;

3.总空间，已使用，可使用清晰展现

select a.tablespace_name,total,free,total-free used from (select tablespace_name,sum(bytes)/1024/1024 from dba_data_files group by tablespace_name) a,(select tablespace_name,sum(bytes)/1024/1024 from dba_free_space group by tablespace_name) b where a.tablespace_name=b.tablespace_name;