Oracle HowTo:如何快速杀死占用过多资源(CPU,内存)的数据库进程

作者:eygle
出处: http://www.eygle.com/blog
日期:October 27, 2005
本文链接: http://www.eygle.com/archives/2005/10/oracle_howto_kill_session.html

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很多时候由于异常或程序错误会导致个别进程占用大量系统资源，需要结束这些进程，通常可以使用以下命令Kill进程:

alter system kill session 'sid,serial#';

但是此命令释放资源极为缓慢，具体可以参考: Oracle中Kill session的研究.
为了更快速的释放资源，通常我们使用如下步骤来Kill进程:
1.首先在操作系统级kill进程
2.在数据库内部kill session
这样通常可以快速中止进程，释放资源。

今天就遇到这样一个案例，其他朋友在数据库里kill session,可是长时间仍无效果:

[oracle@danaly ~]$ sqlplus "/ as sysdba" SQL*Plus: Release 10.2.0.1.0 - Production on Thu Oct 27 11:09:50 2005 Copyright (c) 1982, 2005, Oracle. All rights reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, Oracle Label Security, OLAP and Data Mining Scoring Engine options SQL> select sid,username,status from v$session; SID USERNAME STATUS ---------- ------------------------------ -------- .... 154 SCOTT KILLED ... 30 rows selected.

那按照我前面提到的步骤，首先查询得到该session对应的OS进程号:

SQL> select 'kill -9 '||spid from v$process where addr = (select paddr from v$session where sid=&sid); Enter value for sid: 154 old 1: select 'kill -9 '||spid from v$process where addr = (select paddr from v$session where sid=&sid) new 1: select 'kill -9 '||spid from v$process where addr = (select paddr from v$session where sid=154) 'KILL-9'||SPID -------------------- kill -9 22702 SQL> !

在操作系统级kill该进程:

[oracle@danaly ~]$ ps -ef|grep 22702 oracle 22702 1 0 Oct25 ? 00:00:02 oracledanaly (LOCAL=NO) oracle 12082 12063 0 11:12 pts/1 00:00:00 grep 22702 [oracle@danaly ~]$ kill -9 22702 [oracle@danaly ~]$ ps -ef|grep 22702 oracle 12088 12063 0 11:12 pts/1 00:00:00 grep 22702 [oracle@danaly ~]$ exit exit SQL> select sid,username,status from v$session; SID USERNAME STATUS ---------- ------------------------------ -------- ... 154 SCOTT KILLED ... 30 rows selected. SQL> select sid,serial#,username from v$session where sid=154; SID SERIAL# USERNAME ---------- ---------- ------------------------------ 154 56090 SCOTT

再次在数据库中kill该session,并指定immediate选项:

SQL> alter system kill session '154,56090' immediate; System altered. SQL> select sid,serial#,username from v$session where sid=154; no rows selected

此时该进程被迅速清除。