ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务解决

环境：Oracle 11g R2 + PL SQL Developer + SQL Plus

问题：Oracle主服务和监听器服务已经启动，使用SQL Plus能够正常连接，使用PL SQL Developer连接报次错误：ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务。如图：

解决：

打开H:\Oracle\product\11.2.0\dbhome_1\NETWORK\ADMIN（不同机器目录可能不同）目录下的listener.ora文件，发现此文件内容如下：

#listener.ora Network Configuration File:
H:\Oracle\product\11.2.0\dbhome_1\network\admin\listener.ora
#Generated by Oracle configuration tools.
 
SID_LIST_LISTENER=
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME =H:\Oracle\product\11.2.0\dbhome_1)
      (PROGRAM = extproc)
      (ENVS ="EXTPROC_DLLS=ONLY:H:\Oracle\product\11.2.0\dbhome_1\bin\oraclr11.dll")
    )
  )
 
LISTENER=
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY =EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST =localhost)(PORT = 1521))
    )
  )
 
ADR_BASE_LISTENER= H:\Oracle

修改成如下内容（注意红色部分的内容）：

#listener.ora Network Configuration File:

H:\Oracle\product\11.2.0\dbhome_1\network\admin\listener.ora

#Generated by Oracle configuration tools.

SID_LIST_LISTENER=

(SID_LIST =

(SID_DESC =

(GLOBAL_DBNAME = ORCL)

(ORACLE_HOME =H:\Oracle\product\11.2.0\dbhome_1)

(SID_NAME = ORCL)

)

(SID_DESC =

(SID_NAME = CLRExtProc)

(ORACLE_HOME = H:\Oracle\product\11.2.0\dbhome_1)

(PROGRAM = extproc)

(ENVS ="EXTPROC_DLLS=ONLY:H:\Oracle\product\11.2.0\dbhome_1\bin\oraclr11.dll")

)

)

LISTENER=

(DESCRIPTION_LIST =

(DESCRIPTION =

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

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

)

)

ADR_BASE_LISTENER= H:\Oracle

说明：每台电脑的Oracle安装目录和实例名不尽相同，修改此文件的ORACLE_HOME（本机Oracle安装目录）和SID_NAME应该按照你自己的设置。

SID查看请参照此图：

参考资料：

http://wangda.blog.51cto.com/86296/218498

http://www.cnblogs.com/zyk/archive/2007/10/31/944667.html