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Oracle客户端简易连接报错ORA-12154，TNS-03505

环境：

服务端：RHEL6.5 + Oracle Server 11.2.0.4

客户端：Win2003 + Oracle Client 10.2.0.1

问题现象
Troubleshooting
解决问题

1. 问题现象

服务端安装好Oracle数据库，测试正常。但在用户的客户端测试连接时，报错ORA-12154，TNS-03505

sqlplus system/oracle@192.168.10.10/xxsid

C:/Documents and Settings/Administrator>sqlplus system/oracle@192.168.10.10/xxsid  SQL*Plus: Release 10.2.0.1.0 - Production on 星期四 7月 16 16:53:58 2015  Copyright (c) 1982, 2005, Oracle.  All rights reserved.  ERROR: ORA-12154: TNS: 无法解析指定的连接标识符   请输入用户名:

2. Troubleshooting

tnsping测试：

C:/Documents and Settings/Administrator>tnsping 192.168.10.10  TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 16-7月 - 2015 16:53:00  Copyright (c) 1997, 2005, Oracle.  All rights reserved.  已使用的参数文件: D:/oracle32/product/10.2.0/client_1/network/admin/sqlnet.ora  TNS-03505: 无法解析名称

查看已使用的参数文件sqlnet.ora

# sqlnet.ora Network Configuration File: D:/oracle32/product/10.2.0/client_1/network/admin/sqlnet.ora # Generated by Oracle configuration tools.  # This file is actually generated by netca. But if customers choose to  # install "Software Only", this file wont exist and without the native  # authentication, they will not be able to connect to the database on NT.  SQLNET.AUTHENTICATION_SERVICES= (NTS)  NAMES.DIRECTORY_PATH= (TNSNAMES)

发现NAMES.DIRECTORY_PATH的配置只允许TNSNAMES

3. 解决问题

注释掉sqlnet.ora中NAMES.DIRECTORY_PATH= (TNSNAMES)一行，

注释掉就会采用默认值(TNSNAMES，ONAMES，HOSTNAME)，当然你也可以修改加上这些常用选项。

再次测试，问题解决。

C:/Documents and Settings/Administrator>sqlplus system/oracle@192.168.10.10/xxsid  SQL*Plus: Release 10.2.0.1.0 - Production on 星期四 7月 16 16:54:08 2015  Copyright (c) 1982, 2005, Oracle.  All rights reserved.   连接到: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options  SQL>

如果没有特殊的安全需求或其他规范，建议还是不要随意更改sqlnet.ora文件的配置信息。

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