回收站：
select * from recyclebin
PURGE RECYCLEBIN;
Purge tablespace TBS_KR_YM;
Purge tablespace TBS_KR_YM user lbidw_ym_mobile;
Purge recyclebin; --清空当前用户的回收站
Purge dba_recyclebin;--清空全部用户的回收站
select * from recyclebin
PURGE RECYCLEBIN;
Purge tablespace TBS_KR_YM;
Purge tablespace TBS_KR_YM user lbidw_ym_mobile;
Purge recyclebin; --清空当前用户的回收站
Purge dba_recyclebin;--清空全部用户的回收站