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.

我找到了这个异常的一些原因。他们是

1)默认为数据库XE的名称。因此url将是“jdbc:oracle:thin:@localhost:1521:XE”。

2)确保OracleServiceXE,OracleXETNSListener正在运行。它将在控制面板\所有控制面板项\管理工具\服务

我还没有看到广泛讨论的一种可能性是，在主机上解析主机名本身可能存在问题。如果在/etc/hosts中没有$(hostname)条目，Oracle侦听器会感到困惑，不会出现。

这原来是我的问题，在/etc/hosts中添加主机名和ip地址解决了这个问题。

我在SQL Workbench中也遇到过类似的问题。

URL:

jdbc: oracle:薄:@111.111.111.111:1111:xe

是行不通的。

URL:

jdbc: oracle:薄:@111.111.111.111:1111:asdb

的工作原理。

这对我的具体情况有帮助。恐怕还有许多其他的原因和不同的解决办法。

当我试图使用SQL开发器连接到oracle DB时，我得到了这个错误ORA-12505, TNS:侦听器目前不知道连接描述符中给定的SID。

使用的JDBC字符串是JDBC:oracle:thin:@myserver:1521/XE，显然是正确的，两个强制的oracle服务OracleServiceXE, OracleXETNSListener已经启动并运行。

我解决这个问题的方法(在Windows 10中)

 1. Open run command.
 2. Type services.msc 
 3. Find services with name OracleServiceXE and OracleXETNSListener in the list.
 4. Restart OracleServiceXE service first. After completing the restart try restarting OracleXETNSListener service.

面对类似的错误，上述任何解决方案都不起作用。 监听器有问题。ora文件。我错误地添加了SID的SID_LIST见下面(部分之间的星星*)。

 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)
        )
        )

 *(SID_DESC =
           (SID_NAME = XE)
           (ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
         )*
    LISTENER =
      (DESCRIPTION_LIST =
        (DESCRIPTION =
          (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
          (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
        )
      )


    DEFAULT_SERVICE_LISTENER = (XE)

更正此错误如下:

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
       (SID_NAME = XE)
       (ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
     )
    (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 = 127.0.0.1)(PORT = 1521))
    )
  )


DEFAULT_SERVICE_LISTENER = (XE)

停止，数据库

手动停止监听器OracleServiceXE和OracleXETNSListener，因为它没有通过进入控制面板\所有控制面板项\管理工具\服务自动停止。重新启动数据库，它工作得很好。