配置EM
使用EMCA
复制create 命令进行创建（emca -config dbcontrol db -repos create）（注：要打开数据库）
Enter the following information:
Database SID: PROD（数据库名称）
Listener port number: 1521（端口号）
Listener ORACLE_HOME [ /u01/app/oracle/product/11.2.0/dbhome_1 ]:
Password for SYS user:
Password for DBSNMP user: （需要解锁alter user dbsnmp identified by ORACLE account unlock;）
Password for SYSMAN user:
Email address for notifications (optional):
Outgoing Mail (SMTP) server for notifications (optional):
[oracle@node1 ~]$ emctl status dbconsole
启用em
[oracle@node1 ~]$ emctl start dbconsole