1. 在本机安装了oracle，使用sqlplus和plsqldev连接的时候，tnsname.ora中host写的是localhost，此时连接oracle都没有任何问题，但是外机连接本机，和tnsname.ora中host写成ip地址（192.168.1.110）是，报错ora-12547，没有监听等

  2. 解决问题，oracle自带管理工具，程序-》oracle-oracle...-》配置和移植工具-》Net Manager中找到本地，LISTENER，添加一个监听服务地址，然后重启oracle监听服务，然后就可以使用localhost和ip地址对oracle进行访问了

  3. LISTENER.ORA文件

    

LISTENER =

  (DESCRIPTION_LIST =

    (DESCRIPTION =

      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))

    )

    (DESCRIPTION =

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

    )

    (DESCRIPTION =

      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.110)(PORT = 1521))

    )

  ）


TNSNAME.ORA文件

ORCL =

  (DESCRIPTION =

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

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = orcl)

    )

  )


  

ORCLIP =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.110)(PORT = 1521))

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = orcl)

    )

  )