oracle em 出现问题
       1) Set the environment variable ORACLE_UNQNAME to Database unique name 
    set ORACLE_UNQNAME=$ORACLE_SID(如orcl)
 2) /opt/oracle/product/11.2.0/db_1/bin/emctl start dbconsole
tabase Control execute the following command(s):  
 1) Set the environment variable ORACLE_SID to orcl 
 2) /opt/oracle/product/11.2.0/db_1/bin/emctl stop dbconsole 
 3) /opt/oracle/product/11.2.0/db_1/bin/emctl config emkey -repos -sysman_pwd < Password for SYSMAN user >  
 4) /opt/oracle/product/11.2.0/db_1/bin/emctl secure dbconsole -sysman_pwd < Password for SYSMAN user >  
 5) /opt/oracle/product/11.2.0/db_1/bin/emctl start dbconsole