ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired
參考網址：http://blog.csdn.net/zq9017197/article/details/6909873
http://kms.lenovots.com/kb/article.php?id=3626 （這篇比較重點，主要講鎖的概念）
查看是鎖情況
select s.sid,s.serial#,s.username,to_char(s.logon_time,'yyyy-mm-dd hh24:mi:ss'),l.process,l.locked_mode
from v$locked_object l,v$session s where s.sid = l.session_id;
釋放鎖demo
alter system kill session '192,36381';
192：sid
36381：serial#
