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参考：DROP Tablespace Hangs when the datafile header is corrupted (文档 ID 1529267.1)
 公司同事在RAC上创建创建表空间数据文件误建到了本地系统，尝试删除，发现语句一直在等待中...

收集ASH报告，AWR报告，发现等待事件

 enq: TT - contention

DROP TABLESPACE session was waiting for TT enqueue.

V$LOCK shows many TT locks hold by same session sid=4569.

SQL> select * from v$lock where type='TT';

ADDR KADDR SID TYPE ID1 ID2 LMODE REQUEST CTIME BLOCK
---------------- ---------------- ------ ------ --- --- ----- ------- ------ -----
0000000479C08590 0000000479C085E8 4569 TT 31 0 4 0 132585 0
0000000479C0DBF8 0000000479C0DC50 4569 TT 31 0 4 0 132553 0
0000000479C0E218 0000000479C0E270 4569 TT 31 0 4 0 134884 0

SQL> select sid,pid,spid,s.username,s.program from v$session s,v$process p where s.paddr=p.addr and s.sid=4569;

      SID        PID     SPID          USERNAME      PROGRAM
---------- ---------- ------------- ---------------   ---------------------------------------
     4569       177    17997              BMC          sqlplus@chpdat-pl2 (TNS V1-V3)

 BMC it is a monitoring tool.

处理也比较简单，Patrol关闭，重新执行DROP语句即可。