tns sample

filename : tnsnames.ora
location : 
           windows : %ORACLE_HOME%\network\admin\tnsnames.ora
             linux : $ORACLE_HOME/network/admin
TNS_NAME =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = [IP OR HOST ADDRESS])(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = [SERVICE_NAME])
    )
  )