EM是oracle提供的一个web版的应用程序，在里面可以看到oracle数据库的具体的信息，包括日志、参数、控制文件、整个的内存分配，还有一些统计数据之类的。
首先要检查一下监听，使监听处于READY状态。
[oracle@Annie ~]$ cd $ORACLE_HOME/network/admin
[oracle@Annie admin]$ ls
listener.ora samples shrept.lst tnsnames.ora
[oracle@Annie admin]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 20-APR-2017 03:50:36
Copyright (c) 1991, 2013, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=Annie)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date 20-APR-2017 00:38:20
Uptime 0 days 3 hr. 12 min. 15 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/Annie/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=Annie)(PORT=1521)))
Services Summary...
Service "Annie" has 1 instance(s).
Instance "Annie", status READY, has 1 handler(s) for this service...
Service "AnnieXDB" has 1 instance(s).
Instance "Annie", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@Annie admin]$ emca -config dbcontrol db -repos recreate
STARTED EMCA at Apr 20, 2017 12:39:20 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: Annie
Database Control is already configured for the database Annie
You have chosen to configure Database Control for managing the database Annie
This will remove the existing configuration and the default settings and perform a fresh configuration
----------------------------------------------------------------------
WARNING : While repository is dropped the database will be put in quiesce mode.
----------------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]: yes
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 ................ Annie
Listener ORACLE_HOME ................ /u01/app/oracle/product/11.2.0/dbhome_1
Listener port number ................ 1521
Database SID ................ Annie
Email address for notifications ...............
Outgoing Mail (SMTP) server for notifications ...............
-----------------------------------------------------------------
----------------------------------------------------------------------
WARNING : While repository is dropped the database will be put in quiesce mode.
----------------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]: yes
Apr 20, 2017 12:39:43 AM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/Annie/emca_2017_04_20_00_39_20.log.
Apr 20, 2017 12:39:44 AM oracle.sysman.emcp.util.DBControlUtil stopOMS
INFO: Stopping Database Control (this may take a while) ...
Apr 20, 2017 12:39:47 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Dropping the EM repository (this may take a while) ...
Apr 20, 2017 12:41:13 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully dropped
Apr 20, 2017 12:41:14 AM oracle.sysman.emcp.EMReposConfig createRepository
INFO: Creating the EM repository (this may take a while) ...
Apr 20, 2017 12:46:27 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully created
Apr 20, 2017 12:46:30 AM oracle.sysman.emcp.EMReposConfig uploadConfigDataToRepository
INFO: Uploading configuration data to EM repository (this may take a while) ...
Apr 20, 2017 12:47:45 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Uploaded configuration data successfully
Apr 20, 2017 12:47:51 AM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Securing Database Control (this may take a while) ...
Apr 20, 2017 12:49:07 AM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Database Control secured successfully.
Apr 20, 2017 12:49:07 AM oracle.sysman.emcp.util.DBControlUtil startOMS
INFO: Starting Database Control (this may take a while) ...
Apr 20, 2017 12:49:41 AM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: Database Control started successfully
Apr 20, 2017 12:49:41 AM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: >>>>>>>>>>> The Database Control URL is https://Annie:1158/em <<<<<<<<<<<
Apr 20, 2017 12:49:46 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/Annie_Annie/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 Apr 20, 2017 12:49:46 AM
从浏览器中输入https://192.168.11.3:1158/em
SQL> grant select_catalog_role to scott;（如果用scott用户无法登录EM，输入能让scott登上EM的SQL命令）