我只是错误地创建了数据库链接。

对我来说，简单的解决方法是简单地将“SID”更改为SERVICE_NAME

CREATE DATABASE LINK my_db_link
CONNECT TO myUser IDENTIFIED BY myPassword
USING
'
(
    DESCRIPTION=
    (
        ADDRESS=
        (PROTOCOL=TCP)
        (HOST=host-name-heren)
        (PORT=1521)
    )
    (CONNECT_DATA=(SID=theNameOfTheDatabase))
)';

改变

SID=theNameOfTheDatabase

to

SERVICE_NAME=theNameOfTheDatabase 

解决了我的问题。

我也有同样的问题，所以为了解决这个问题，我首先使用netca重新配置我的侦听器，之后我删除了我的旧数据库，这是ORCL使用dbca，然后我再次使用dbca创建了新的数据库

@Luke Woodward的回答帮助我确定我的XE没有连接。 我在连接VPN时遇到了一个问题。我使用的是Windows 11上的最新本地Oracle 21c。 文件监听器。Ora和tnsnames。我们使用我的电脑名称“ERIK-PC”是这样的:

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = ERIK-PC)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

我只需要将ERIK-PC更改为localhost。 更多信息在这个帖子里。 顺便说一下，我使用的是Oracle 21c，从18c开始，*。ora文件在installationfolder\homes\OraDB21Home1\network\admin\*.ora下 保存您的更改并使用特权的windows shell重新启动侦听器:

lsnrctl stop
lsnrctl start

Oracle: 精简样式的服务名称语法

只有JDBC Thin驱动程序支持精简样式的服务名称。语法为:

/ service_name @ / / host_name: port_number进行

http://docs.oracle.com/cd/B28359_01/java.111/b31224/urls.htm#BEIDHCBA

I too faced the same issue. I had installed Oracle Express edition 10g in Windows XP OS using VMware and it was working fine. Since it was very awkward typing SQL queries in the SQL utility provided by 10g and since I was used to working with SQL developer, I installed 32 bit SQL developer in XP and tried connecting to my DB SID "XE". But the connection failed with error-ORA-12505 TNS listener doesn't currently know of SID given in connect descriptor. I was at sea as to how this problem occurred since it was working fine with the SQL utility and I had also created few Informatica mappings using the same. I did browse a lot on this stuff hither thither and applied the suggestions offered to me after pinging the status of "lsnrctl" on public forums but to no avail. However, this morning I tried creating a new connection again, and Voila, it worked with no issues. I am guessing after reading in few posts that sometimes listener listens before the DB connects or something(pardon me for my crude reference as I am a newbie here) but I suggest to just restart the machine and check again.

我的oracle DB服务器IP最近发生了变化，我在/etc/hosts文件中硬编码了值:

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.210.61 myoracledb.mycompanydomain.com myoracledb

必须将192.168.210.61 IP更改为新的IP, lsnrctl停止，然后lsnrctl启动 这些步骤解决了我的问题。