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来源于：http://www.cnblogs.com/loveLearning/p/3625544.html
oracle之报错:ORA-00054: 资源正忙，要求指定 NOWAIT
问题如下：
SQL> conn scott/tiger@vm_database
Connected to Oracle Database 11g Enterprise Edition Release 11.1.0.6.0
Connected as scott
。。。。。。
SQL> drop table student2;
drop table student2
ORA-00054: 资源正忙, 但指定以 NOWAIT 方式获取资源, 或者超时失效
=========================================================
解决方法如下：
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SQL> select session_id from v$locked_object;
SESSION_ID
----------
142
SQL> SELECT sid, serial#, username, osuser FROM v$session where sid = 142;
SID SERIAL# USERNAME OSUSER
---------- ---------- ------------------------------ ------------------------------
142 38 SCOTT LILWEN
SQL> ALTER SYSTEM KILL SESSION ‘142,38‘;
System altered
1.查询数据库中的锁
select * from v$lock;
select * from v$lock where block=1;
2.查询被锁的对象
select * from v$locked_object;
3.查询阻塞
查被阻塞的会话
select * from v$lock where lmode=0 and type in (‘TM‘,‘TX‘);
查阻塞别的会话锁
select * from v$lock where lmode>0 and type in (‘TM‘,‘TX‘);
4.查询数据库正在等待锁的进程
select * from v$session where lockwait is not null;
5.查询会话之间锁等待的关系
select a.sid holdsid,b.sid waitsid,a.type,a.id1,a.id2,a.ctime from v$lock a,v$lock b
where a.id1=b.id1 and a.id2=b.id2 and a.block=1 and b.block=0;
6.查询锁等待事件
select * from v$session_wait where event=‘enqueue‘;
解决方案：
select session_id from v$locked_object; --首先得到被锁对象的session_id
SELECT sid, serial#, username, osuser FROM v$session where sid = session_id; --通过上面得到的session_id去取得v$session的sid和serial#，然后对该进程进行终止。
ALTER SYSTEM KILL SESSION ‘sid,serial‘;
example:
ALTER SYSTEM KILL SESSION ‘13, 8‘;
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原文地址：http://www.cnblogs.com/ys-wuhan/p/5956983.html
