杀死进程后，oracle数据库无法启动

报错信息：
报错信息一：

You are running addbctl.sh version 120.1

Starting the database PROD ...

SQL*Plus: Release 11.1.0.7.0 - Production on Thu Apr 18 17:18:44 2013

Copyright (c) 1982, 2008, Oracle.  All rights reserved.

Connected.
ORA-01081: cannot start already-running ORACLE - shut it down first
Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

addbctl.sh: exiting with status 9

报错信息二：

ORA-00205: error in identifying control file, check alert log for more info

Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

addbctl.sh: exiting with status 9

原因：
上次关闭数据库是通过杀死进程的方式。  所以这次无法正常启动。

解决方法：
1. ps查看ora的进程，然后将其全部杀死，用kill -9命令。
2. 删除文件： /d01/penske/ora11g/product/11.2.0/dbhome_1/dbs/lkPROD
如果不删除这个文件，数据库还是启动不起来。
3. 删除共享内存段：
查看共享内存段：  ipcs
将属于oracle的用户的删除： 
ipcrm -m 0
ipcrm -s 0
序号根据   man  ipcrm 来查找即可。
4. 正常启动即可。
/d01/penske/ora11g/product/11.2.0/dbhome_1/appsutil/scripts/PROD_plaspashcn13/addbctl.sh start