今天碰到一个问题，有一张表不能操作，很可能是被锁了，首先想到的是kill session，于是执行了下列的脚本找到是哪个session有问题：
查看表是否被锁
SELECT /*+ rule*/
a.sid, b.owner, object_name, object_type
FROM v$lock a, all_objects b
WHERE TYPE = 'TM'
and a.id1 = b.object_id;

根据上面查询出的sid，找出对应的serial#:
SELECT sid,serial# FROM v$session WHERE sid = &sid;

发现有一个会话有锁sid 197,serial# 17，于是执行alter system kill session ‘197,17’;大概等了30s中，pl/sql developer报出一个错误:ora-00031:标记要终止的会话。

解决方法：查出session的spid

select spid, osuser, s.program from v$session s, v$process p where s.paddr = p.addr and s.sid =197;

1. 在linux上， kill -9 12345

2. 在windows上，C:\Documents and Settings\gg>orakill orcl 12345

orcl：表示要杀死的进程属于的实例名

12345：是要杀掉的线程号

ORA-00031: session marked for kill

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

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

ITPub博客

ORA-00031:session marked for kill（标记要终止的会话）解决方法

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