--查询锁表信息，可以查看是谁锁了表，然后找他释放
select sess.sid,
sess.serial#,
lo.oracle_username,
lo.os_user_name,
ao.object_name,
lo.locked_mode
from v$locked_object lo,
dba_objects ao,
v$session sess
where ao.object_id = lo.object_id and lo.session_id = sess.sid;
--如果死锁了，可以根据sessionID来杀死锁表进程，sessionID是上一个sql查出来的（v$session.sid+','+v$session.SERIAL#）
alter system kill session '510,9398';