配置好rac后,两个节点用tnsping都可以ping通,但用sqlplus连接都出现以下错误,不知道哪里出了问题

[oracle@rac2 admin]$ lsnrctl status

LSNRCTL for Linux: Version 9.2.0.4.0 - Production on 04-MAR-2008 08:32:26

Copyright (c) 1991, 2002, Oracle Corporation.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=rac2)(PORT=1521)))

STATUS of the LISTENER

------------------------

Alias                     LISTENER

Version                   TNSLSNR for Linux: Version 9.2.0.4.0 - Production

Start Date                04-MAR-2008 08:29:03

Uptime                    0 days 0 hr. 3 min. 22 sec

Trace Level               off

Security                  OFF

SNMP                      OFF

Listener Parameter File   /home/oracle/9.2.0.4/network/admin/listener.ora

Listener Log File         /home/oracle/9.2.0.4/network/log/listener.log

Listening Endpoints Summary...

(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=rac2)(PORT=1521)))

Services Summary...

Service "PLSExtProc" has 1 instance(s).

Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...

Service "esal" has 2 instance(s).

Instance "rac1", status READY, has 1 handler(s) for this service...

Instance "rac2", status READY, has 1 handler(s) for this service...

The command completed successfully

[oracle@rac2 admin]$ lsnrctl service

LSNRCTL for Linux: Version 9.2.0.4.0 - Production on 04-MAR-2008 08:32:32

Copyright (c) 1991, 2002, Oracle Corporation.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=rac2)(PORT=1521)))

Services Summary...

Service "PLSExtProc" has 1 instance(s).

Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...

Handler(s):

"DEDICATED" established:0 refused:0

LOCAL SERVER

Service "esal" has 2 instance(s).

Instance "rac1", status READY, has 1 handler(s) for this service...

Handler(s):

"DEDICATED" established:0 refused:0 state:ready

REMOTE SERVER

(address=(protocol=tcp)(host=rac1)(port=1521))

Instance "rac2", status READY, has 1 handler(s) for this service...

Handler(s):

"DEDICATED" established:0 refused:0 state:ready

LOCAL SERVER

The command completed successfully

[oracle@rac2 admin]$ sqlplus cy/zh@esal

SQL*Plus: Release 9.2.0.4.0 - Production on Tue Mar 4 08:32:45 2008

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

ERROR:

ORA-12154: TNS:could not resolve service name

Enter user-name:

ERROR:

ORA-01017: invalid username/password; logon denied

Enter user-name: cy/zh@rac1

ERROR:

ORA-12154: TNS:could not resolve service name

SP2-0157: unable to CONNECT to ORACLE after 3 attempts, exiting SQL*Plus

[oracle@rac2 admin]$ sqlplus cy/zh@rac2

SQL*Plus: Release 9.2.0.4.0 - Production on Tue Mar 4 08:32:59 2008

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

ERROR:

ORA-12154: TNS:could not resolve service name

Enter user-name:

按照如下过程，一般都能解决：

在虚拟机内开cmd，用lsnrctl status查看监听器监听的服务

如看到监听服务“orcl”，那在本机的tns配置中(SERVICE_NAME = orcl)必须写orcl；如果想要自定义，则在虚拟机内的listener配置中就要加入自定义服务名，记得要重启监听服务：lsnrctl reload

最后形成的配置文件如下

虚拟机listener：

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC =

(GLOBAL_DBNAME = test) 自定义服务名

(ORACLE_HOME = E:oracleproduct10.2.0db_1) db_home

(SID_NAME = test)

)

(SID_DESC =

(PROGRAM = extproc)

(SID_NAME = PLSExtProc)

(ORACLE_HOME = E:oracleproduct10.2.0db_1) ##这个服务保证你可以使用外部过程，如C程序

)

)

本机tns：

ORCL_XNJ =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 182.12.15.232)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = test) 与自定义服务名对应

)

)

再次连接，问题解决！

记住，一定从最简单的原因找起，不要一上去就看到网上的什么改process数、注册表之类的，要想想本机能连为什么通过网络就不行，还是定位问题。

VS2008连接oracle 出现错误 ora-12154 tns 无法解析指定的连接标示符

在保证你的代码没有错误的前提下：

(一)检查OracleOraDb10g_home1TNSListener 服务有没有启动，即监听服务

(二)检查tnsnames.ora是否添加连接串(建议用SQLPLUS或者pl/sql测试)，其路径一般是：%Oracle_home%product10.2.0db_1NETWORKADMINtnsnames.ora

其它网友的补充：

今天装oracle安装都完成了，但出现了“ORA-12154 TNS”的错误，最开始以为是oracle安装处了问题，但后来发现并不是，因为用SQL Plus可以登录，只是用plsql登录时才出现这错，用360完全卸载了qlsql后，从新装了次，还是那错，郁闷。。。后来又把数据库删掉重新建立，还是不行，整了半天，最后自己都整晕了，算了，重头再来吧。。。

百度下很多安装图解，按着来就成

oracle完全卸载

https://www.jb51.net/article/96395.htm

或者直接在注册表中按F3搜索oracle，删除注册文件，不过貌似文件有点多，操作有点慢，建议用上边链接的方法

总结了下要注意的几点

1.安装服务端是一般选“基本安装”就行

2.使用PLSQL Developer时,“ORA-12154 TNS无法解析指定的连接标识符”的问题

安装时报后边的错“warning some oracle net versions cannot connect from a path with parentheses”，这错原来提示了，不能有括号，修改了安装路径就没有问题了

相应的上边的“ORA-12154 TNS无法解析指定的连接标识符”错也没啦，有点晕，没整明白，但确实好啦

3.“ORA-12154 TNS无法解析指定的连接标识符”按照网上的方法有两种，但我试了，在我这都不好使，下边贴出来，没准儿啥时候可以用

1.解决办法，修改PLSQL Developer的选项设置：

客户端、服务器端Oracle软件装好之后，用PLSQL Devloper登录时，点击取消，进入PLSQL Developer主界面，菜单Tools-Preferences，在设置窗口中，选择Oracle-Connection，对应设置窗口中，找到Oracle Home，选择OraDb10g_home1，保存设置，重新登录PLSQL Developer即可

2.修改D:\oracle\product\10.2.0\db_1\NETWORK\ADMIN路径下的tnsnames.ora文件

###### 一般的配置 ##################################

ORALOCAL =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))

)

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = oralocal)

)

)

以上答案供参考