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查看sysman和dbsnmp用户状态，发现sysman用户状态为锁住
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正确修改sysman和dbsnmp用户密码的方法如下：
1、关闭em
[oracle@dbserver ~]$ emctl stop dbconsole
Oracle Enterprise Manager 11g DatabaseControl Release 11.2.0.4.0
Copyright (c) 1996, 2013 OracleCorporation. All rights reserved.
https://dbserver:1158/em/console/aboutApplication
Stopping Oracle Enterprise Manager 11gDatabase Control ...
... Stopped.
[oracle@dbserver ~]$
2、修改sysman的密码并且给sysman用户解锁
3、执行emctl setpasswd dbconsole命令修改密码
[oracle@dbserver ~]$ emctl setpasswddbconsole
Oracle Enterprise Manager 11g DatabaseControl Release 11.2.0.4.0
Copyright (c) 1996, 2013 OracleCorporation. All rights reserved.
https://dbserver:1158/em/console/aboutApplication
Please enter new repository password:
Repository password successfully updated.
[oracle@dbserver ~]$
4、修改dbsnmp用户的口令
[oracle@dbserver emd]$ pwd
/u01/app/oracle/product/11.2.0/db_1/dbserver_sztech1/sysman/emd
[oracle@dbserver emd]$
[oracle@dbserver emd]$ cp targets.xmltargets.xml.bak
[oracle@dbserver emd]$vi targets.xml
修改下面内容
<Property NAME="password"VALUE="oracle123" ENCRYPTED="FALSE"/>
5、重新启动em
[oracle@dbserver emd]$ emctl startdbconsole
Oracle Enterprise Manager 11g DatabaseControl Release 11.2.0.4.0
Copyright (c) 1996, 2013 OracleCorporation. All rights reserved.
https://dbserver:1158/em/console/aboutApplication
Starting Oracle Enterprise Manager 11gDatabase Control ..... started.
------------------------------------------------------------------
Logs are generated in directory/u01/app/oracle/product/11.2.0/db_1/dbserver_sztech1/sysman/log
[oracle@dbserver emd]$
6、验证
可以看到，em可以正常使用
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