oracle的库,太占空间啦. 有没有办法可以缩小???

2007-09-27  15:50         1,613,824 CONTROL01.CTL
2007-09-27  15:50         1,613,824 CONTROL02.CTL
2007-09-27  15:50         1,613,824 CONTROL03.CTL
2007-09-27  15:50        20,979,712 CWMLITE01.DBF
2007-09-27  15:50        20,979,712 DRSYS01.DBF
2007-09-27  15:50       125,837,312 EXAMPLE01.DBF
2007-09-27  15:50        26,222,592 INDX01.DBF
2007-09-27  15:50        20,979,712 ODM01.DBF
2007-09-27  15:50       104,858,112 REDO01.LOG
2007-09-27  15:50       104,858,112 REDO02.LOG
2007-09-27  15:50       104,858,112 REDO03.LOG
2007-09-27  15:50       419,438,592 SYSTEM01.DBF
2007-09-27  15:50        42,999,808 TEMP01.DBF
2007-09-27  15:50        10,493,952 TOOLS01.DBF
2007-09-27  15:50       298,852,352 UNDOTBS01.DBF
2007-09-27  15:50        26,222,592 USERS01.DBF
2007-09-27  15:50        39,985,152 XDB01.DBF
              17 个文件  1,372,407,296 字节
               2 个目录 75,186,982,912 可用字节刚建的一个数据库, 大小:1.27 GB (1,372,407,296 字节)这是个空库呀, 点的空间有点太大了吧。 请问:有没有办法可以缩小???