ORA-12528，TNS:监听器:所有合适的实例都在阻塞新的连接

Question

Hi当尝试通过数据连接创建存储库创建实用程序时，详细信息不例外。它抛出异常是

Listener refused the connection with the following error:
ORA-12528, TNS:listener: all appropriate instances are blocking new connections

tnsnames.ora

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = sivanagendra-lap)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    (UR = A)
    )
  )
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) 
    ) 
  ) 

请给我这个问题的解决方案。

Answer 1

的可能原因

1. 数据库是否处于受限模式
2. 数据库是否未装入？或者启动？如果是后者，那么这可能是一个暂时的问题——等到它完全启动
3. 对于共享连接，可能是所有共享服务器都很忙。对于专用连接，可能是进程或会话参数过低。或者您可能遇到了一些操作系统限制/设置（例如某个ulimits）