--查询数据库表空间使用情况
select a.tablespace_name,a.bytes/1024/1024 "Sum MB",(a.bytes-b.bytes)/1024/1024 "used MB",b.bytes/1024/1024 "free MB",round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"
from
(select tablespace_name,sum(bytes) bytes from dba_data_files group by tablespace_name) a,
(select tablespace_name,sum(bytes) bytes,max(bytes) largest from dba_free_space group by tablespace_name) b
where a.tablespace_name=b.tablespace_name
order by ((a.bytes-b.bytes)/a.bytes) desc
--可以查看该表空间总共有几个数据文件，每个数据文件是否自动扩展，可以自动扩展的最大值
select file_name,tablespace_name,bytes/1024/1024 "bytes MB",maxbytes/1024/1024 "maxbytes MB" from dba_data_files
where tablespace_name='MSDDMS_DATA';
--查看表空间是否为自动扩展
select file_id,file_name,tablespace_name,autoextensible,increment_by
from dba_data_files where tablespace_name='MSDDMS_DATA' order by file_id desc;
select dbms_metadata.get_ddl('TABLESPACE','MSDDMS_DATA') from dual;