linux ORA-12560: TNS:protocol adapter error

前些天，把linux的主机名改了，如从localhost改成rac面后发现客户端连接不到oracle,打开监听器配置如下

[root@rac admin]# cat listener.ora 

# listener.ora Network Configuration File: /u01/oracle/network/admin/listener.ora

# Generated by Oracle configuration tools.

SID_LIST_LISTENER =   

  (SID_LIST =

    (SID_DESC =

      (SID_NAME = orcl)

      (ORACLE_HOME = /u01/oracle)

      (PROGRAM = extproc)

    )

    (SID_DESC =

      (GLOBAL_DBNAME = orcl)

      (ORACLE_HOME = /u01/oracle)

      (SID_NAME = orcl)

    )

  )

LISTENER =

  (DESCRIPTION_LIST =

    (DESCRIPTION =

      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))

    )

  )

注意此时肜的主机名是localhost，但实际改过后的主机名是rac,故此时客户端就连接不到oracle

修改如下：

LISTENER =

  (DESCRIPTION_LIST =

    (DESCRIPTION =

      (ADDRESS = (PROTOCOL = TCP)(HOST = rac)(PORT = 1521))

    )

  )

注意要先停止监听器，而后再改监听器配置文件，而后再启动监听器，否则会报

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=rac)(PORT=1521)))

TNS-12541: TNS:no listener

 TNS-12560: TNS:protocol adapter error

  TNS-00511: No listener

   Linux Error: 111: Connection refused

既不允许在监听器运行过程中，修改其监听器配置文件