1. 停止AGENT和OMS服务  

[oracle@ipadtest Disk1]$ $AGENT_HOME/bin/emctl stop agent
Oracle Enterprise Manager 10g Release 3 Grid Control 10.2.0.3.0. 
Copyright (c) 1996, 2007 Oracle Corporation.  All rights reserved.
[oracle@ipadtest Disk1]$

[oracle@ipadtest Disk1]$ $AGENT_HOME/bin/emctl stop agent
Oracle Enterprise Manager 10g Release 3 Grid Control 10.2.0.3.0. 
Copyright (c) 1996, 2007 Oracle Corporation.  All rights reserved.

[oracle@ipadtest Disk1]$ $OMS_HOME/bin/emctl stop oms -all
Oracle Enterprise Manager 10g Release 3 Grid Control 
Copyright (c) 1996, 2007 Oracle Corporation.  All rights reserved.
Oracle Management Server is Down.

2.删除GC OMS所在主机中所有与GC相关的内容

1）需要在oracle用户下删除的内容
su - oracle
rm -rf /u01/app/oraInventory
rm -rf /u01/app/oracle/*
rm -rf /tmp/*
2）需要在root下删除的内容
su - root
rm -f /etc/oratab
rm -f /usr/local/bin/*
3）重新启动操作系统
reboot

3.GC repository database中需要完成的删除动作
1）删除SYSMAN和MGMT_VIEW用户
此步骤是为了防止在OMS配置过程中因数据库对象存在导致报错。
SQL> drop user SYSMAN cascade;

User dropped.

SQL> drop user MGMT_VIEW cascade;

User dropped.

2）删除表空间
[oracle@ocmdb1 ~]$ export ORACLE_SID=ocmgc
[oracle@ocmdb1 ~]$ sqlplus / as sysdba
SQL> select tablespace_name from dba_tablespaces where tablespace_name like 'MGMT%';

TABLESPACE_NAME
------------------------------
MGMT_ECM_DEPOT_TS
MGMT_TABLESPACE

SQL> drop tablespace MGMT_ECM_DEPOT_TS including contents and datafiles;

Tablespace dropped.

SQL> drop tablespace MGMT_TABLESPACE including contents and datafiles;

Tablespace dropped.

4.重新安装GC的OMS
请参考《【GC】OEL4.8部署安装 Grid Control OMS》（http://space.itpub.net/519536/viewspace-667751）重新进行安装。

5.小结
按照这个过程我们便完成了GC OMS的重新安装。但是，注意此时GC OMS还不能够正常的监控到原Agent的信息，需要做对原Agent做进一步的调整。关于配置Agent应对OMS服务器变化的调整下回分解。