oracle监听报The listener supports no services

一、问题描述

启动oracle监听程序时报如下错误，The listener supports no services

二、原因分析

数据库实例没注册到listener

三、处理过程

在listener.ora里面添加了红色标记的代码，具体如下：

[oracle@oracle11g admin]$ cat listener.ora 
# listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = oracle11g)(PORT = 1521))
    )
  )
SID_LIST_LISTENER =  
(SID_LIST =  
  (SID_DESC =  
  (GLOBAL_DBNAME = orcl)
  (SID_NAME = orcl)
  )
)
ADR_BASE_LISTENER = /u01/app/oracle