比起用其它的视图写长长的一段脚本、简便多了、据说从7.x到11g都可以用

sm$ts_used     &    sm$ts_free

idle> select * from sm$ts_used;

TABLESPACE_NAME BYTES

------------------------------ ----------

SYSAUX 256573440

UNDOTBS1 8323072

USERS 3211264

SYSTEM 506789888

EXAMPLE 71499776

idle> select * from sm$ts_free;

TABLESPACE_NAME BYTES

------------------------------ ----------

UNDOTBS1 23068672

SYSAUX 15990784

USERS 1966080

SYSTEM 6946816

EXAMPLE 33292288