emctlstartdbconsole遇到错误：OC4J_DBConsole_XXX_XXXnotfound.

想启动Oracle的OEM服务，运行emctl start dbconsole，结果出现如下报错信息：
/u01/app/oracle/product/11.2.0/dbhome_1/oc4j/j2ee/OC4J_DBConsole_wjq.comsys.com_OraDB11g not found。要想打开OEM的web管理程序，必须先启动Database listener，再启动Datebase Control端口监控程序，但是碰到下面的问题：

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[oracle@wjq ~]$ emctl start dbconsole

OC4J Configuration issue. /u01/app/oracle/product/11.2.0/dbhome_1/oc4j/j2ee/OC4J_DBConsole_wjq.comsys.com_OraDB11g not found.

其实产生的这样的情况，可能是em资料库配置不正确或者是dbcotrol没有配置好。

解决方法：

①重建em资料

[oracle@wjq ~]$ emca -repos recreate

STARTED EMCA at Nov 3, 2017 4:35:17 PM

EM Configuration Assistant, Version 11.2.0.3.0 Production

Enter the following information:

Database SID: seiang11g

Listener port number: 1521

Password for SYS user:

Password for SYSMAN user:

----------------------------------------------------------------------

WARNING : While repository is dropped the database will be put in quiesce mode.

----------------------------------------------------------------------

Do you wish to continue? [yes(Y)/no(N)]: Y

Nov 3, 2017 4:35:34 PM oracle.sysman.emcp.EMConfig perform

INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/OraDB11g/emca_2017_11_03_16_35_16.log.

Nov 3, 2017 4:35:34 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Dropping the EM repository (this may take a while) ...

Nov 3, 2017 4:36:47 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Repository successfully dropped

Nov 3, 2017 4:36:47 PM oracle.sysman.emcp.EMReposConfig createRepository

INFO: Creating the EM repository (this may take a while) ...

Nov 3, 2017 4:40:32 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Repository successfully created

Enterprise Manager configuration completed successfully

FINISHED EMCA at Nov 3, 2017 4:40:32 PM

②配置dbcontrol

[oracle@wjq ~]$ emca -config dbcontrol db

STARTED EMCA at Nov 3, 2017 2:29:41 PM

EM Configuration Assistant, Version 11.2.0.3.0 Production

Enter the following information:

Database SID: seiang11g

Listener port number: 1521

Listener ORACLE_HOME [ /u01/app/oracle/product/11.2.0/dbhome_1 ]:

Password for SYS user:

Password for DBSNMP user:

Password for SYSMAN user:

Email address for notifications (optional):

Outgoing Mail (SMTP) server for notifications (optional):

-----------------------------------------------------------------

You have specified the following settings

Database ORACLE_HOME ................ /u01/app/oracle/product/11.2.0/dbhome_1

Local hostname ................ wjq.comsys.com

Listener ORACLE_HOME ................ /u01/app/oracle/product/11.2.0/dbhome_1

Listener port number ................ 1521

Database SID ................ seiang11g

Email address for notifications ...............

Outgoing Mail (SMTP) server for notifications ...............

-----------------------------------------------------------------

Do you wish to continue? [yes(Y)/no(N)]: y^H

Nov 3, 2017 2:30:36 PM oracle.sysman.emcp.EMConfig perform

INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/OraDB11g/emca_2017_11_03_14_29_40.log.

Nov 3, 2017 2:30:39 PM oracle.sysman.emcp.EMReposConfig uploadConfigDataToRepository

INFO: Uploading configuration data to EM repository (this may take a while) ...

Nov 3, 2017 2:32:36 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Uploaded configuration data successfully

Nov 3, 2017 2:32:38 PM oracle.sysman.emcp.util.DBControlUtil secureDBConsole

INFO: Securing Database Control (this may take a while) ...

Nov 3, 2017 2:32:53 PM oracle.sysman.emcp.util.PlatformInterface executeCommand

WARNING: Error executing /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl secure dbconsole -host wjq.comsys.com -sid OraDB11g

Nov 3, 2017 2:32:53 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration

WARNING: Error securing Database control.

Nov 3, 2017 2:32:53 PM oracle.sysman.emcp.EMDBPostConfig setWarnMsg

INFO: Error securing Database Control. Database Control has been brought-up in non-secure mode. To secure the Database Control execute the following command(s):

1) Set the environment variable ORACLE_UNQNAME to Database unique name

2) /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl stop dbconsole

3) /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl config emkey -repos -sysman_pwd < Password for SYSMAN user >

4) /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl secure dbconsole -sysman_pwd < Password for SYSMAN user >

5) /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl start dbconsole

To secure Em Key, run /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl config emkey -remove_from_repos -sysman_pwd < Password for SYSMAN user >

Nov 3, 2017 2:32:53 PM oracle.sysman.emcp.util.DBControlUtil startOMS

INFO: Starting Database Control (this may take a while) ...

Nov 3, 2017 2:32:58 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration

INFO: Database Control started successfully

Nov 3, 2017 2:32:58 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration

INFO: >>>>>>>>>>> The Database Control URL is http://wjq.comsys.com:5500/em <<<<<<<<<<<

Error securing Database Control. Database Control has been brought-up in non-secure mode. To secure the Database Control execute the following command(s):

1) Set the environment variable ORACLE_UNQNAME to Database unique name

2) /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl stop dbconsole

3) /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl config emkey -repos -sysman_pwd < Password for SYSMAN user >

4) /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl secure dbconsole -sysman_pwd < Password for SYSMAN user >

5) /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl start dbconsole

To secure Em Key, run /u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl config emkey -remove_from_repos -sysman_pwd < Password for SYSMAN user >

然后直接进入http://wjq.comsys.com:5500/em/,输入账户sys和密码******，选择sysdba权限，就能正常看到基于WEB的EM了。

Oracle11G的EM采用了web方式，并且分成了2个产品，database control和grid control。Grid control需要下载单独的光盘安装。在用DBCA建库的时候，可以选择是否启用dbcontrol，启用的话需要在数据库中建立一个sysman的 schema，用于保存EM的一些数据，这个就是EM的资料库(repository)。使用命令行工具emca可以创建，修改，重建或者删除 dbcontrol的配置。

emca -repos create: 创建新的 Database Control资料档案库
emca -repos drop:删除当前的 Database Control资料档案库
emca -repos recreate:删除当前的 Database Control资料档案库并重新创建一个
emca -config dbcontrol db：配置数据库的 Database Control

emca -deconfig dbcontrol db：取消数据库的 Database Control

特别注意：

（1）如果服务器上存在多个数据库，必须在启动Database control之前设置ORACLE_SID环境变量
（2）最好使用静态IP地址来配置服务器

常用的命令语法：

emca -repos create创建一个EM资料库

emca -repos recreate重建一个EM资料库

emca -repos drop删除一个EM资料库

emca -config dbcontrol db配置数据库的 Database Control

emca -deconfig dbcontrol db删除数据库的 Database Control配置

emca -reconfig ports 重新配置db control和agent的端口

emctl start console启动EM console服务，使用前需要先设置ORACLE_SID环境变量

emctl stop console停止EM console服务，使用前需要先设置ORACLE_SID环境变量

注：通过查看$ORACLE_HOME/install/portlist.ini文件可以知道当前dbcontrol正在使用的端口，默认dbcontrol http端口1158，agent端口3938。如果要重新配置端口，可以使用如下命令：

emca -reconfig ports -dbcontrol_http_port 1159

emca -reconfig ports -agent_port 3939

使用命令行工具emctl可以启动/停止console服务，察看服务状态等。

作者：SEian.G（苦练七十二变，笑对八十一难）

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