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我是甲骨文的新手，所以对于可能是微不足道或愚蠢的问题，我很抱歉。我需要通过这样的数据库链接互连两个 oracle 数据库（12g 和 11g）：

CREATE SHARED DATABASE LINK SYSEL AUTHENTICATED BY scot IDENTIFIED BY ********* USING 'SYSEL'

我的 tnsnames.ora：

or# tnsnames.ora Network Configuration File: C:\app\Administrator\product\12.1.0\dbhome_1\network\admin\tnsnames.ora
Generated by Oracle configuration tools.

LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = Panoramix)(PORT = 1524))


ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1524))
)
(CONNECT_DATA =
  (SID = CLRExtProc)
  (PRESENTATION = RO)
)
 )

ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Panoramix)(PORT = 1524))
(CONNECT_DATA =
  (SERVER = DEDICATED)
  (SERVICE_NAME = orcl)
)
)


SYSEL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Panoramix)(PORT = 1521))
(CONNECT_DATA =
  (SERVER = DEDICATED)
  (SERVICE_NAME = studuk)
  )
)

但如果我运行查询（例如select * from dual@sysel），我总是会收到此错误：ORA-12541: TNS:neexistuje žádný proces listener 12541. 00000 - "TNS:no listener" *原因：连接请求无法完成，因为监听器没有运行。*操作：确保提供的目标地址与侦听器使用的地址之一相匹配 - 将 TNSNAMES.ORA 条目与适当的 LISTENER.ORA 文件（或 TNSNAV.ORA，如果连接通过交换）进行比较。在远程机器上启动监听器。行错误：1 列：20

我的 LISTENER.ORA：

 SID_LIST_LISTENER =
 (SID_LIST =
(SID_DESC =
  (SID_NAME = CLRExtProc)
  (ORACLE_HOME = C:\app\Administrator\product\12.1.0\dbhome_1)
  (PROGRAM = extproc)
  (ENVS = "EXTPROC_DLLS=ONLY:C:\app\Administrator\product\12.1.0\dbhome_1\bin\oraclr12.dll")
 )
 )

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1524))
  (ADDRESS = (PROTOCOL = TCP)(HOST = Panoramix)(PORT = 1524))
 )
)

我在 panoramix 上有一个 stunnel（它正在完全工作，我能够通过 sql developer 连接到 studuk 以及我能够 tnsping studuk。但是数据库链接不起作用。我认为，可能有必要修改一些方式listener.ora，但我不知道如何...可能出了什么问题？请帮忙。祝你好运 Josef K。

现在侦听器在端口 1521 上侦听，但尝试将查询作为 select * from dual@sysel 运行，但不幸的是这个错误：

    ORA-12514: TNS:proces listener v současnosti nezná službu požadovanou v deskriptoru připojení
   12514. 00000 -  "TNS:listener does not currently know of service requested in connect    descriptor"
  *Cause:    The listener received a request to establish a connection to a
       database or other service. The connect descriptor received by the listener
       specified a service name for a service (usually a database service)
         that either has not yet dynamically registered with the listener or has
       not been statically configured for the listener.  This may be a temporary
       condition such as after the listener has started, but before the database
       instance has registered with the listener.
 *Action:   
       - Wait a moment and try to connect a second time.
       - Check which services are currently known by the listener by executing:
       lsnrctl services <listener name>
       - Check that the SERVICE_NAME parameter in the connect descriptor of the
       net service name used specifies a service known by the listener.
       - If an easy connect naming connect identifier was used, check that
       the service name specified is a service known by the listener.
       - Check for an event in the listener.log file.

行错误：1 列：20

我已经尝试修改我的 listener.ora，以便将服务 sysel 注册到 listener，但没有成功：

SID_LIST_listener=
 (SID_LIST=
(SID_DESC=
(GLOBAL_DBNAME=SYSEL)
(SID_NAME=studuk)
(ORACLE_HOME=C:\app\Administrator\product\12.1.0\dbhome_1)))

显然，我的 Oracle 实例无法向侦听器注册服务 SYSEL，我也尝试过 ALTER SYSTEM REGISTER，但没有成功。

剧本

select value from v$parameter where name='service_names'

只返回默认的“ORCL”

我应该如何向侦听器注册服务 SYSEL？谢谢约瑟夫·K。

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