查看表空间的使用情况：

SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
       D.TOT_GROOTTE_MB "表空间大小(M)",
       D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
       TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,
                     2),
               '990.99') "使用比",
       F.TOTAL_BYTES "空闲空间(M)",
       F.MAX_BYTES "最大块(M)"
  FROM (SELECT TABLESPACE_NAME,
               ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
               ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
          FROM SYS.DBA_FREE_SPACE
         GROUP BY TABLESPACE_NAME) F,
       (SELECT DD.TABLESPACE_NAME,
               ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
          FROM SYS.DBA_DATA_FILES DD
         GROUP BY DD.TABLESPACE_NAME) D
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
ORDER BY 4 DESC

查看表空间的文件构成情况：

select tablespace_name, file_id, file_name,
 round(bytes/(1024*1024),0) total_space
 from dba_data_files
 order by tablespace_name;

2009/09/27 12:09 - Oracle

Reader's Comments

1. baizhaoxian | 2009/10/12 16:20

   表空间的使用情况也可以用下列简洁SQL语句：
   SQL> select * from sm$ts_used;

   TABLESPACE_NAME BYTES
   ------------------------------ ----------
   DRSYS 10092544
   EXAMPLE 152436736
   ODM 9895936
   SYSTEM 351338496
   TOOLS 6291456
   UNDOTBS1 2318336
   XDB 46792704

   7 rows selected.
   SQL> select * from sm$ts_free;

   TABLESPACE_NAME BYTES
   ------------------------------ ----------
   DRSYS 10813440
   EXAMPLE 196608
   INDX 26148864
   ODM 11010048
   SYSTEM 5111808
   TOOLS 4128768
   UNDOTBS1 207290368
   USERS 26148864
   XDB 327680

2. banping | 2009/10/13 10:19

   to baizhaoxian：不错，sys用户的对象，谢谢。