Oracle 10g : ORA-12514:listener does not currently know of service requested in connect descriptor
最近装了Oracle 10g，当我用pl/sql去连接的时候，经常报listener does not currently know of service requested in connect descriptor错误，有时候是好的，有时候会有错误。当发生错误的时候我重启了oracle服务和oracle监听，还是没用，重启一下电脑或许会好，或许不会好；有时候现在不行，过会去连接有可以了；有时候现在时好的，当我重启电脑后，又不行了。我真的搞不懂这是怎么回事，有些人说重启下监听和服务就可以了，但是我的怎么却不行呢？出现这样的情况我觉得跟tnsnames.ora和listener.ora应该没关系吧，因为有时候是可以的，但是我还是贴出来让各位大虾看看，希望能够帮偶解决下
tnsnames.ora
ORCL =
  (DESCRIPTION =
  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
  (CONNECT_DATA =
  (SERVER = DEDICATED)
  (SERVICE_NAME = orcl)
  )
  )

listener.ora
SID_LIST_LISTENER =
  (SID_LIST =
  (SID_DESC =
  (SID_NAME = PLSExtProc)
  (ORACLE_HOME = F:\oracle\product\10.1.0\Db_1)
  (PROGRAM = extproc)
  )
  )

LISTENER =
  (DESCRIPTION_LIST =
  (DESCRIPTION =
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
  )
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
  )
  )
  )

------解决方案--------------------
ORA-12514: TNS:监听程序当前无法识别连接描述符中请求的服务
ORA-12514: 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.

------解决方案--------------------
顶下..........
------解决方案--------------------
对比下面的配置，添加一项估计就可以了。

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /usr/u01/app/oracle/product/10.2.0.1)
(PROGRAM = extproc)
)
(SID_DESC =
(SID_NAME = orcl)
(ORACLE_HOME = /usr/u01/app/oracle/product/10.2.0.1)
)
)
------解决方案--------------------
service_name是否正确?


把server上的参数列出来






------解决方案--------------------
用netca重新建下监听，
排除环境变量导致找不到tnsnames.ora的原因。
修改下listener.ora
标准的Listener.ora格式如下
[oracle@xtxgk1 admin]$ more listener.ora
# LISTENER.ORA Network Configuration File: /oracle/9.2.0/network/admin/listener.
ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /oracle/product/10.2.0/db_1)
(PROGRAM = extproc)
)