oracle 表空间使用情况

select * from (  Select a.tablespace_name,  to_char(a.bytes/1024/1024,'99,999.999') total_bytes,  to_char(b.bytes/1024/1024,'99,999.999') free_bytes,  to_char(a.bytes/1024/1024 - b.bytes/1024/1024,'99,999.999') use_bytes,  to_char((1 - b.bytes/a.bytes)*100,'99.99') || '%' use  from (select tablespace_name,  sum(bytes) bytes  from dba_data_files  group by tablespace_name) a,  (select tablespace_name,  sum(bytes) bytes  from dba_free_space  group by tablespace_name) b  where a.tablespace_name = b.tablespace_name  union all select c.tablespace_name,  to_char(c.bytes/1024/1024,'99,999.999') total_bytes,  to_char( (c.bytes-d.bytes_used)/1024/1024,'99,999.999') free_bytes,  to_char(d.bytes_used/1024/1024,'99,999.999') use_bytes,  to_char(d.bytes_used*100/c.bytes,'99.99') || '%' use  from (select tablespace_name,sum(bytes) bytes  from dba_temp_files group by tablespace_name) c,  (select tablespace_name,sum(bytes_cached) bytes_used  from v$temp_extent_pool group by tablespace_name) d  where c.tablespace_name = d.tablespace_name  )