查询表空间使用情况：

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;

修改表空间大小：

alter database datafile 'E:/oracle/product/10.2.0/oradata/DEV/DEV_CENTER.DBF' resize 500m;