–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$locked_object a,dba_objects b where b.object_id = a.object_id;
–查看那个用户那个进程照成死锁
select b.username,b.sid,b.serial#,logon_time from v$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;
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 ‘210,11562’; 此处不能连接起来 要有空格，不然会报错的例如（alter system kill session’210,11562′; ）。
来自：https://www.cnblogs.com/xqiu/p/5212787.html