--以下几个为相关表

SELECT * FROM v$lock;
SELECT * FROM v$sqlarea;
SELECT * FROM v$session;
SELECT * FROM v$process ;
SELECT * FROM v$locked_object;
SELECT * FROM all_objects;
SELECT * FROM v$session_wait;

--查看被锁的表

select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;

或者用这个sql

select 'blocker('||lb.sid||':'||sb.username||')-sql:'|| qb.sql_text blockers, 
'waiter ('||lw.sid||':'||sw.username||')-sql:'|| qw.sql_text waiters 
from v$lock lb, 
v$lock lw, 
v$session sb, 
v$session sw, 
v$sql qb, 
v$sql qw 
where lb.sid=sb.sid 
and lw.sid=sw.sid 
and sb.prev_sql_addr=qb.address 
and sw.sql_address=qw.address 
and lb.id1=lw.id1 
and sw.lockwait is not null 
and sb.lockwait is null 
and lb.block=1 ;

--查看那个用户那个进程照成死锁

select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;

--查看连接的进程

SELECT sid, serial#, username, osuser FROM v$session;

--3.查出锁定表的sid, serial#,os_user_name, machine_name, terminal,锁的type,mode

SELECT s.sid, s.serial#, s.username, s.schemaname, s.osuser, s.process, s.machine,
s.terminal, s.logon_time, l.type
FROM v$session s, v$lock l
WHERE s.sid = l.sid
AND s.username IS NOT NULL
ORDER BY sid;

如果上面SQL执行时间太长可以用下面这个:

select object_name,machine,s.sid,s.serial# 
from v$locked_object l,dba_objects o ,v$session s
where l.object_id = o.object_id and l.session_id=s.sid;

这个语句将查找到数据库中所有的DML语句产生的锁,还可以发现,
任何DML语句其实产生了两个锁,一个是表锁,一个是行锁。

--杀掉进程 sid,serial

alter system kill session 'sid,serial#'; 
alter system kill session'210,11562';

如果上面的命令杀死一个进程后,进程状态被置为"killed",但是锁定的资源很长时间没有被释放,那么可以在os一级再杀死相应的进程(线程),首先执行下面的语句获得进程(线程)号:

select spid, osuser, s.program 
from v$session s,v$process p
where s.paddr=p.addr and s.sid=210 (210是上面的sid)

直接用root身份执行命令:

kill -9 12345(即上面查询出的spid)
带符号 * 的表示必填项