（1） show parameter name
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert                 string
db_name                              string      helowin
db_unique_name                       string      helowin
global_names                         boolean     FALSE
instance_name                        string      helowin
lock_name_space                      string
log_file_name_convert                string
service_names                        string      helowin

（2） listener.ora 
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT = 1521))
    )
  )
ADR_BASE_LISTENER = /home/oracle/app/oracle
SID_LIST_LISTENER =
(SID_LIST =
  (SID_DESC =
  (GLOBAL_DBNAME = helowin)
  (ORACLE_HOME = /home/oracle/app/oracle/product/11.2.0home_2/)
  (SID_NAME = helowin)))
 
（3）rman
 rman target sys/sys@helowin
connected to target database (not started)