ORA-12505, TNS:listener 当前不知道连接描述符中给出的 SID。无法连接到oracle 11g？

Question

我已经安装了 Oracle 11.2 表达式版并且运行良好。突然，当我下次打开它时，我收到了这个错误 - 我的结果没有任何改变。

这是我的tnsnames.ora 文件和我的listener.ora 文件

tnsnames.ora：

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = DESKTOP-JAS1O0C)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )

ORACLR_CONNECTION_DATA = 
  (DESCRIPTION = 
    (ADDRESS_LIST = 
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1)) 
    ) 
    (CONNECT_DATA = 
      (SID = CLRExtProc) 
      (PRESENTATION = RO) 
    ) 
  ) 

listener.ora:

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = DESKTOP-JAS1O0C)(PORT = 1521))
    )
  )

DEFAULT_SERVICE_LISTENER = (XE)

错误：

Answer 1

对于这样的场景，alert_<SID>.log 是您的朋友。在这里您可以诊断数据库的健康状况。

您的 Windows 服务可以是 running，但您的数据库可以是以下任何一种模式：stopped | nomount | mount | open

%ORACLE_BASE%\diag\rdbms\xe\XE\trace\alert_XE.log

祝你好运！