1、删除OEM
[oracle@strong ~]$ emca -deconfig dbcontrol db -repos drop
STARTED EMCA at Jul 30, 2017 6:09:06 AM
EM Configuration Assistant, Version 11.2.0.3.0 Production
Copyright (c) 2003, 2011, Oracle. All rights reserved.
Enter the following information:
Database SID: orcl
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
Jul 30, 2017 6:09:39 AM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/orcl/emca_2017_07_30_06_09_05.log.
Jul 30, 2017 6:09:40 AM oracle.sysman.emcp.util.DBControlUtil stopOMS
INFO: Stopping Database Control (this may take a while) ...
Jul 30, 2017 6:10:03 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Dropping the EM repository (this may take a while) ...
Jul 30, 2017 6:11:29 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully dropped
Enterprise Manager configuration completed successfully
FINISHED EMCA at Jul 30, 2017 6:11:32 AM
[oracle@strong ~]$
2、重新安装OEM
[oracle@strong ~]$ export ORACLE_UNQNAME=orcl
[oracle@strong ~]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.4.0 Production on Sun Jul 30 06:15:39 2017
Copyright (c) 1982, 2013, Oracle. All rights reserved.
SQL> conn / as sysdba
Connected.
SQL> alter user dbsnmp identified by system;
User altered.
[oracle@strong ~]$ emca -config dbcontrol db -repos create;
STARTED EMCA at Jul 30, 2017 6:25:52 AM
EM Configuration Assistant, Version 11.2.0.3.0 Production
Copyright (c) 2003, 2011, Oracle. All rights reserved.
Enter the following information:
Database SID: orcl
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 ................ strong.oracle.com
Listener ORACLE_HOME ................ /u01/app/oracle/product/11.2.0/dbhome_1
Listener port number ................ 1521
Database SID ................ orcl
Email address for notifications ...............
Outgoing Mail (SMTP) server for notifications ...............
-----------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]: Y
Jul 30, 2017 6:26:44 AM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/orcl/emca_2017_07_30_06_25_52.log.
Jul 30, 2017 6:26:44 AM oracle.sysman.emcp.EMReposConfig createRepository
INFO: Creating the EM repository (this may take a while) ...
Jul 30, 2017 6:30:15 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully created
Jul 30, 2017 6:30:21 AM oracle.sysman.emcp.EMReposConfig uploadConfigDataToRepository
INFO: Uploading configuration data to EM repository (this may take a while) ...
Jul 30, 2017 6:31:19 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Uploaded configuration data successfully
Jul 30, 2017 6:31:22 AM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Securing Database Control (this may take a while) ...
Jul 30, 2017 6:32:33 AM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Database Control secured successfully.
Jul 30, 2017 6:32:33 AM oracle.sysman.emcp.util.DBControlUtil startOMS
INFO: Starting Database Control (this may take a while) ...
Jul 30, 2017 6:33:15 AM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: Database Control started successfully
Jul 30, 2017 6:33:15 AM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: >>>>>>>>>>> The Database Control URL is https://strong.oracle.com:1158/em <<<<<<<<<<<
Jul 30, 2017 6:33:28 AM oracle.sysman.emcp.EMDBPostConfig invoke
WARNING:
************************ WARNING ************************
Management Repository has been placed in secure mode wherein Enterprise Manager data will be encrypted. The encryption key has been placed in the file: /u01/app/oracle/product/11.2.0/dbhome_1/strong.oracle.com_orcl/sysman/config/emkey.ora. Ensure this file is backed up as the encrypted data will become unusable if this file is lost.
***********************************************************
Enterprise Manager configuration completed successfully
FINISHED EMCA at Jul 30, 2017 6:33:28 AM
[oracle@strong ~]$ emctl status dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0
Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
https://strong.oracle.com:1158/em/console/aboutApplication
Oracle Enterprise Manager 11g is running.
------------------------------------------------------------------
Logs are generated in directory /u01/app/oracle/product/11.2.0/dbhome_1/strong.oracle.com_orcl/sysman/log
[oracle@strong ~]$
3、异常情况下重新安装EM
（1）删除原有信息
SQL> drop role mgmt_user;
drop user mgmt_view cascade;
drop user sysman cascade;
drop public synonym MGMT_TARGET_BLACKOUTS;
drop public synonym SETEMVIEWUSERCONTEXT;
drop public synonym MGMT_AVAILABILITY;
drop public synonym MGMT_CURRENT_AVAILABILITY;
drop public synonym MGMT_SEVERITY_OBJ;
（2）重建EM
[oracle@strong ~]$ emca -config dbcontrol db -repos create
如果失败，用下面的语句：
[oracle@strong ~]$ emca -config dbcontrol db -repos recreate
查看状态
[oracle@strong ~]$ emctl status dbconsole
emca常用命令：
[oracle@strong ~]$ emctl -h
创建一个EM资料库
emca -repos create
重建一个EM资料库
emca -repos recreate
删除一个EM资料库
emca -repos drop
配置数据库的 Database Control
emca -config dbcontrol db
删除数据库的 Database Control配置
emca -deconfig dbcontrol db
重新配置db control的端口，默认端口在1158
emca -reconfig ports
emca -reconfig ports -dbcontrol_http_port 1160
emca -reconfig ports -agent_port 3940
先设置ORACLE_SID环境变量后,启动EM console服务
emctl start dbconsole
先设置ORACLE_SID环境变量后,停止EM console服务
emctl stop dbconsole
先设置ORACLE_SID环境变量后,查看EM console服务的状态
配置dbconsole的步骤
emca -repos create
emca -config dbcontrol db
emctl start dbconsole
重新配置dbconsole的步骤
emca -repos drop
emca -repos create
emca -config dbcontrol db
emctl start dbconsole
