一次修改dbsnmp，sysman密码的尝试
set oracle_sid=
1.emctl stop dbconsole
2.CONNECT / AS SYSDBA
3.alter user dbsnmp identified by oracle
4.通过连接用户测试新密码
5.编辑targets.xml （oracle/product/10.2.0/db_1/sysman/emd）
<Property NAME="password" VALUE="829e1a25401de489" ENCRYPTED="TRUE"/>
Replace the encrypted value by the new password value
Replace TRUE by FALSE
5.重启dbconsole
emctl start dbconsole（restart dbconsole）
进去报一个java异常，
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| java.lang.Exception: Received unexpected response text : <html><head><title>EMDAEMON</title></head><body text="#000000" bgcolor="#FFFFC0"><H1>EMDAEMON</H1><H2> HTTP/1.1 404 , Not Found<br></h2></body></html> | ||
再次进去，报java异常：
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| java.lang.Exception: No such metric | ||
注：EM Daemon is not running.修改密码第一次前进去OEM时候，emctl status dbconsole,看到EM Daemon is not running.提示。推测此时应该由于监视密码与dbsnmp密码不匹配的问题。配置监视密码后再次查看emctl status dbconsole，可以看到dbconsole状态正常。
sysman密码修改
1.停止dbconsole
emctl stop dbconsole
查看状态确认已经停止emctl status dbconsole
2.sqlplus / as sysdba
alter user sysman identified by 123;
3.解锁用户(select username,account_status from dba_users;)
alter user sysman account unlock;
4.测试新密码
5.修改emoms.properties（oracle/product/10.2.0/db_1/计算机名_实例名/sysman/config）
将emoms.properties另存为emoms.properties.old
修改emoms.properties文件
找到oracle.sysman.eml.mntr.emdRepPwd=把等于后的加密字串替换成刚才更改的密码oracle123;
找到oracle.sysman.eml.mntr.emdRepPwdEncrypted=TRUE 把TRUE换成FALSE。
emctl setpasswd dbconsole
emctl start dbconsole
>emctl status dbconsole ，显示如下
http://pc-198801010322:5500/em/console/aboutApplication
EM Daemon is not running.
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再次敲入上面命令，显示dbconsole状态正常
>emctl status dbconsole
http://pc-198801010322:5500/em/console/aboutApplication
Oracle Enterprise Manager 10g is running.
可以进入