oracle锁表问题

1、Select * From v$locked_object;锁表对象
根据sessionid,到Tools--sessions找到相应的sessions即可看到锁表的sql语句

或直接执行：
         Select a.inst_id,
       c.sid,
       c.serial#,
       d.name,
       b.object_name,
       c.username,
       a.object_id,
       c.program,
       c.status,
       c.osuser,
       c.terminal
  from gv$Locked_object a, All_objects b, gv$session c, audit_actions d
where a.object_id = b.object_id
   and a.inst_id = c.inst_id(+)
   and a.session_id = c.sid(+)
   and c.command = d.action;

2、Select * From v$session_longops 锁表时间
Select * From dba_objects;

＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝

Select * from dba_locks where blocking_others like 'Blocking%';

---
Select a.inst_id,
       c.sid,
       c.serial#,
       d.name,
       b.object_name,
       c.username,
       a.object_id,
       c.program,
       c.status,
       c.osuser,
       c.terminal
  from gv$Locked_object a, All_objects b, gv$session c, audit_actions d
where a.object_id = b.object_id
   and a.inst_id = c.inst_id(+)
   and a.session_id = c.sid(+)
   and c.command = d.action;


可以查看死锁的状态，死锁的用户，死锁的机器以及死锁的程序
select username,lockwait,status,machine,program from v$session where sid in
(select session_id from v$locked_object)

Select * From v$locked_object;
Select * From dba_objects;

如果发生了锁等待，我们可能更想知道是谁锁了表而引起谁的等待
以下的语句可以查询到谁锁了表，而谁在等待。
以上查询结果是一个树状结构，如果有子节点，则表示有等待发生。
如果想知道锁用了哪个回滚段，还可以关联到V$rollname，其中xidusn就是回滚段的USN
col user_name format a10
col owner format a10
col object_name format a10
col object_type format a10

SELECT /*+ rule */ lpad(' ',decode(l.xidusn ,0,3,0))||l.oracle_username User_name,
o.owner,o.object_name,o.object_type,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
ORDER BY o.object_id,xidusn DESC

解锁.c ____我只会解锁.


(1)以系统管理员登陆
sqlplus name/passwd@dbname as sysdba


(2)查看锁

select t2.username,t2.sid,t2.serial#,t2.logon_time from v$locked_object t1,v$session t2 where t1.session_id=t2.sid order by t2.logon_time;


(3)把锁给KILL掉
--alter system kill session 'sid,serial#';
alter system kill session '146,21177';

(4)给账户解锁
sqlplus sys/oracle1234@remotedb as sysdba
alter user hbhp account unlock;

===============================
处理Oracle中杀不掉的锁

一些ORACLE中的进程被杀掉后，状态被置为"killed"，但是锁定的资源很长时间不释放，有时实在没办法，只好重启数据库。现在提供一种方法解决这种问题，那就是在ORACLE中杀不掉的，在OS一级再杀。



1.下面的语句用来查询哪些对象被锁：


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;

2.下面的语句用来杀死一个进程：
alter system kill session '24,111'; (其中24,111分别是上面查询出的sid,serial#)

【注】以上两步，可以通过Oracle的管理控制台来执行。

3.如果利用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=24 （24是上面的sid）

4.在OS上杀死这个进程（线程）：
1)在unix上，用root身份执行命令:
#kill -9 12345（即第3步查询出的spid）
2)在windows（unix也适用）用orakill杀死线程，orakill是oracle提供的一个可执行命令，语法为：
orakill sid thread
其中：
sid：表示要杀死的进程属于的实例名
thread：是要杀掉的线程号，即第3步查询出的spid。
例：c:>orakill orcl 12345


ORA-00031: session marked for kill


Cause: The session specified in an ALTER SYSTEM KILL SESSION command cannot be killed immediately (because it is rolling back or blocked on a network operation), but it has been marked for kill. This means it will be killed as soon as possible after its current uninterruptible operation is done.

Action: No action is required for the session to be killed, but further executions of the ALTER SYSTEM KILL SESSION command on this session may cause the session to be killed sooner.



kill -9 12345