Question

oracle TNS问题 ORA-12154: TNS:could not resolve the connect identifier specified

listener.ora文件
# listener.ora Network Configuration File: /u01/app/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 = /u01/app/oracle/product/10.2.0/db_1)
(PROGRAM = extproc)
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = dbs91.example.com)(PORT = 1521))
)
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
)

tnsnames.ora文件
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.

CATDB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = dbs91.example.com)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = catdb)
)
)

ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = dbs91.example.com)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.example.com)

)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)
操作系统验证能登录sqlplus / as sydba
sqlplus sys/oracle@orcl as sysdba 不行
服务器与客户端同一台机

Answer 1

1、问题 ORA-12154: TNS:could not resolve the connect identifier specified ，即无法解析指定的连接，这说明缺少了一个环境变量，TNS_ADMIN 。

2、找到PLSQL中的oracle home（主目录）和OCI library（oci.dll地址）配置。

3、核对完上述问题后如发现问题仍旧没有解决，查看tnsnames.ora文件，查看数据库配置信息前面是否有空格。

4、查看环境变量的设置是否正确，在环境变量path中添加oracle客户端的安装路径。

Answer 2

tns could not resolve the connect identifier specified意思是：TNS无法解决连接标指定识符的问题。可以添加环境变量，或者重新连接来解决问题。

详细解释：
resolve 英[rɪˈzɒlv] 美[rɪˈzɑ:lv]
vt. 决心; 决定;
vt. 使消释; 使分解，使解体; （指委员会或集会） 表决; 消退（炎症等）;
vi. 分解; 下决定;
[例句]We must find a way to resolve these problems before it's too late.
我们必须及时找到解决这些问题的方法。

identifier 英[aɪˈdentɪfaɪə(r)]
n. 识别符; 检验人，标识符; 鉴别器; 编号;
[例句]Another common mistake is to confuse a prefix with an identifier.
另一种常见的错误是混淆了前缀和标识符。

specified 英['spesɪfaɪd] 美['spesɪfaɪd]
v. 指定( specify的过去式和过去分词 ); 详述; 提出…的条件; 使具有特性;
[例句]They specified a spacious entrance hall.
他们专门指定要一个宽敞的大门厅。

Answer 3

应该是环境变量出错，几天前我也是一直报这个错，后来找身边弄好了的拷了一个
path==
D:\oracle\product\10.2.0\db_1\bin;D:\oracle\product\10.2.0\client_1\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\
由于我是oracle初学者，不能给你太多的帮助，谅解下

Answer 4

XP系统下面安装了oracle11g 数据库以及PLSQL Developer7.0的数据库客户端

当我连接到远程服务器上面的oracle9数据库时，先是出现“could not load E:\app\Administrator\product\11.2.0\client_1\oci.dll”等一系列问题，

E:\app正是我oracle11g的安装目录，根据提示我查看了E:\app\Administrator\product\11.2.0目录下不存在client_1目录，

于是我又安装了一个10.0oracle客户端，再从该客户端的安装路径找到一个client_1目录将其拷贝到E:\app\Administrator\product\11.2.0目录下面，

本以为一切OK了，没想到出现了新的错误提示“could not resolve the connect identifier specified”，于是我添加环境变量后问题解决解决。

TNS_ADMIN ->> E:\app\Administrator\product\11.2.0\dbhome_1\NETWORK\ADMIN

Answer 5

listener.ora文件
# listener.ora Network Configuration File: /u01/app/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)
最后一行改成
(SID_NAME = orcl)

lsnrctl status 看一下监听状态，重启一下

追问

试过了，侦听器正常的

追答

ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = dbs91.example.com)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.example.com)
)

(SERVICE_NAME = orcl.example.com) 改成 (SERVICE_NAME = orcl)试试

把lsnrctl service 结果放上来看看