解除死锁

00002解除死锁                                                  

尝试在sqlplus中通过sql命令进行删除，如果能够删除成功，则万事大吉！但通常情况下，出现死锁时，想通过命令行或者通过oracle的管理工具删除有死锁的session，oracle只会将该session标记为killed，但无法清除掉，往往需要通过第二步在操作系统层级进行删除！

Connected to Oracle9i Enterprise Edition Release 9.2.0.1.0
Connected as quik

SQL> select xidusn, object_id, session_id, locked_mode from v$locked_object; --查死锁的对象，获取其SESSION_ID

    XIDUSN OBJECT_ID SESSION_ID LOCKED_MODE
---------- ---------- ---------- -----------
        10      30724         29           3
        10      30649         29           3

SQL> select username,sid,serial# from v$session where sid=29; --根据上步获取到的sid查看其serial#号

USERNAME                              SID    SERIAL#
------------------------------ ---------- ----------
QUIK                                   29      57107

SQL> alter system kill session '29,57107'; --删除进程，如已经删除过，则会报ora-00031的错误；否则oracle会将该session标记为killed状态，等待一段时间看能否会自动消失，如长时间消失不掉，则需要做后续步骤

alter system kill session '29,57107'

ORA-00031: session marked for kill

SQL> select pro.spid from v$session ses,v$process pro where ses.sid=29 and ses.paddr=pro.addr; --查看spid号，以便在操作系统中根据该进程号删除进程

SPID
------------
2273286


第二步：进入操作系统进行删除进程，本示例的操作系统是IBM aix。

Microsoft Windows XP [版本 5.1.2600]
(C) 版权所有 1985-2001 Microsoft Corp.

C:\Documents and Settings\Administrator>telnet 10.73.52.7 --通过telnet远程登陆到数据库服务器

AIX Version 5
(C) Copyrights by IBM and by others 1982, 2005.
login: root --录入用户名
root's Password: --录入密码
*******************************************************************************
*                                                                             *
*                                                                             *
* Welcome to AIX Version 5.3!                                                *
*                                                                             *
*                                                                             *
* Please see the README file in /usr/lpp/bos for information pertinent to    *
* this release of the AIX Operating System.                                  *
*                                                                             *
*                                                                             *
*******************************************************************************
Last unsuccessful login: Fri Apr 23 14:42:57 BEIDT 2010 on /dev/pts/1 from 10.73
.52.254
Last login: Fri Apr 23 15:27:50 BEIDT 2010 on /dev/pts/2 from 10.73.52.254

# ps -ef|grep 2273286 --查看进程详情
    root 2289864 2494636   0 17:07:15 pts/1 0:00 grep 2273286
oracle 2273286       1   0 14:38:24      - 0:21 oracleQUIK (LOCAL=NO)
# kill -9 2273286 --删除进程，小心操作，别写错进程号，如果oracle的关键进程被删，数据库会崩溃的！
# ps -ef|grep 2273286 --再次查看
    root 2289864 2494636   0 17:07:15 pts/1 0:00 grep 2273286

   For Windows, at the DOS Prompt: orakill sid spid

   For UNIX at the command line> kill –9 spid




-------------------------查询语句
select xidusn, object_id, session_id, locked_mode from v$locked_object;

select username,sid,serial# from v$session where sid=59;

alter system kill session '59,296';