oracle查看那些表被锁

• 查被锁的表，以及用户

SELECT object_name, machine, s.sid, s.serial#
FROM gv$locked_object l, dba_objects o, gv$session s
WHERE l.object_id　= o.object_id
AND l.session_id = s.sid; 

• 解锁，释放SESSION SQL

alter system kill session 'sid, serial#'; 

• 实例
  https://images2015.cnblogs.com/blog/520239/201701/520239-20170116155417505-507781551.png
  现在想要sys_dbcfileinfo表被锁定，如果处于其他用户一直忘记提交状态，现在继续操作这个表，
  即可执行如下sql解锁：

alter system kill session '63,33884'

• 查看是否有表被锁定

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 ;

• 查看被锁的表

select   p.spid,a.serial#,c.object_name,b.session_id,b.oracle_username,b.os_user_name  
from   v$process  p,v$session   a,  v$locked_object   b,all_objects  c  
 where  p.addr=a.paddr   and  a.process=b.process   and  c.object_id=b.object_id ; 

• 查看那个用户那个进程照成死锁

select b.owner,b.object_name,l.session_id,l.locked_mode fromv$locked_object l, dba_objects b whereb.object_id=l.object_id;

• 查看连接的 进程

SELECT sid, serial#, username, osuser FROMv$session; 

• 查看是哪个session引起的

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;  

• 其他

--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';

参考：
https://www.cnblogs.com/SweetMemory/p/6289980.html
https://www.cnblogs.com/XQiu/p/5212787.html