ORA-12514:TNS:監聽程序當前無法識別連接描述符中請求的服務

ORA-12514:TNS:監聽程序當前無法識別連接描述符中請求的服務

PL/SQL連接Oracle數據庫的時候 報"ORA-12514: TNS:監聽程序當前無法識別連接描述符中請求的服務" 錯誤

本例原因：

安裝Oracle時一般默認實例都是orcl，發現有人不按套路出牌，改了名字，如圖

解決方法：

在Oracle安裝目錄 找到listener.ora文件 路徑為 D:\oracle\product\11.2.0\dbhome_1\NETWORK\ADMIN

(根據自己情況查找) 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))
)
)

紅色部分為新添加內容，JTW為監聽的實例名

然後修改(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)
    )
  )

重啟Oracle監聽