ORA-12514: TNS:监听程序当前无法识别连接描述符中请求的服务详解数据库

PL/SQL连接Oracle数据库的时候 报”ORA-12514: TNS:监听程序当前无法识别连接描述符中请求的服务” 错误

本例原因：

安装Oracle时一般默认实例都是orcl，发现有人不按套路出牌，改了名字，如图

解决方法：

在Oracle安装目录 找到listener.ora文件 路径为 D:/oracle/product/11.2.0/dbhome_1/NETWORK/ADMIN

(根据自己情况查找) 修改：

# listener.ora Network Configuration File: D:/oracl/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 = D:/oracle/product/11.2.0/dbhome_1)
      (PROGRAM = extproc)
      (ENVS = “EXTPROC_DLLS=ONLY:D:/oracle/product/11.2.0/dbhome_1/bin/oraclr11.dll”)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = JTW)
      (ORACLE_HOME = D:/oracle/product/11.2.0/dbhome_1)
      (SID_NAME = JTW)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
  )

红色部分为新添加内容，JTW为监听的实例名

然后修改(添加)instantclient_11_2/network/admin/tnsnames.ora

MyOracle = 
  (DESCRIPTION = 
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) 
    (CONNECT_DATA = 
      (SERVER = DEDICATED) 
      (SERVICE_NAME = jtw) 
    ) 
  )

重启Oracle监听

参考资料：链接

作者：itmyhome