ORA-12518: TNS: 监听程序无法分发客户机连接

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ORA-12518: TNS: 监听程序无法分发客户机连接

今天在自己的T61上装了ORACLE10G，成功装好后，连数据库报如下错误：

SQL> conn sys/sys@my10g as sysdba
ERROR:
ORA-12518: TNS: 监听程序无法分发客户机连接

SQL> conn sjh/sjh@my10g
ERROR:
ORA-12518: TNS: 监听程序无法分发客户机连接

C:\Documents and Settings\is_sjh> tnsping my10g

TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 12-3月 -
2008 19:59:46

已使用的参数文件:
c:\oracle\product\10.2.0\db_1\network\admin\sqlnet.ora

已使用 TNSNAMES 适配器来解析别名
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)
(HOST = localhost)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = oracsjh)))
OK (20 毫秒)

TNSNAMES.ORA的内容如下：

MY10G =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = oracsjh)
    )
)

listner.ora的内容如下：

# listener.ora Network Configuration File: c:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = c:\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = oracsjh)
      (ORACLE_HOME = c:\oracle\product\10.2.0\db_1)
      (SID_NAME = oracsjh)
    )
)

LISTENER =
(DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = WWW-D413A159A8B.nj.chervon.com)(PORT = 1521))
    )
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
    )
)

一再检查没发现什么问题啊，后来用OS认证的方式连到DB上一看才知道自己犯了一个很低级的错误。INSTANCE NAME跟两个配置文件的配置不一样。将oracsjh改为跟数据库INSTANCE名一样：sjhorac

问题解决。为了证实自己的想法，我又让问题重现：

TNSNAMES.ORA的内容如下：

MY10G =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = ABC)
    )
)

listner.ora的内容如下：

# listener.ora Network Configuration File: c:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = c:\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = ABC)
      (ORACLE_HOME = c:\oracle\product\10.2.0\db_1)
      (SID_NAME = ABC)
    )
)

将SERVICE_NAME ，GLOBAL_DBNAME ，SID_NAME 改为ABC。重起LISTENER。

TNSPING依然是可以的。

C:\Documents and Settings\is_sjh>tnsping my10g

TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 12-3月 -
2008 20:47:52

已使用的参数文件:
c:\oracle\product\10.2.0\db_1\network\admin\sqlnet.ora

已使用 TNSNAMES 适配器来解析别名
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)
(HOST = localhost)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = ORAC)))
OK (10 毫秒)

--问题重现：

SQL> conn sjh/sjh@my10g
ERROR:
ORA-12518: TNS: 监听程序无法分发客户机连接

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