ORA-12154: TNS:could not resolve the connect identifier specified
I installed an 11g client on win10 and found that I could not connect to the company's database. For the solution, please refer to the following method.
Solved the problem of Initialization error Could not load . After filling in the information on the login interface to log in, another message appeared.
Problem ORA-12154: TNS:could not resolve the connect identifier specified , that is, the specified connection could not be resolved
identifier. This shows that an environment variable, TNS_ADMIN , is missing .
Solution:
windows:
Right-click My Computer -> Properties -> Advanced -> Environment Variables -> Administrator 's User Variables -> New ,
The variable name is: TNS_ADMIN
The variable value is: %ORACLE_HOME%/NETWORK/ADMIN/
--Resolve garbled characters
Create a new variable, set the variable name: NLS_LANG , the variable value: SIMPLIFIED CHINESE_CHINA.ZHS16GBK , OK
Where %ORACLE_HOME% is the installation path of Oracle ,
In fact, the value of the set environment variable is the path where the tnsnames.ora file is located, especially after reinstallation or other operations, I forgot to set it
TNS_ADMIN variable, PL/SQL login will report the error " Unable to parse the specified connection identifier " , and set the TNS_ADMIN variable
The amount is to be able to find tnsnames.ora . If ORACLE is installed on this machine and the ORACLE_HOME environment variable is set
amount, then it will automatically find the tnsnames.ora file in the %ORACLE_HOME%/NETWORK/ADMIN/ location .
PLSQL even Oracle database Could not load " ...\bin\oci.dll"
When PL/SQL is installed on 64 -bit win7 , the error "Could not load "...\bin\oci.dll"" is often encountered . I checked the information, and the reason is that PL/SQL only supports 32 -bit OS . The solution Is to additionally load an oci.dll file , the operation is as follows:
Step1:
Download the package "instantclient_10_2" containing oci.dll from the following address , and extract the file to "D:\Program Files\"
http://download.csdn.NET/detail/shenkxiao/4181424
Step2:
After installing the Oracle client and configuring TNS , start PL/SQL , click the " Cancel " button in the login, and directly enter the PL/SQL operation interface without logging in. Click " Preferences " under " Tools " as follows:
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Figure 1 : PL/SQL Preferences
Step3: Select the oci.dll file in the plug-in in the Step1 directory , click " Confirm " , as shown below:
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Figure 2 : PL/SQL loads OCI.dll
Step4: 登录页面中在“数据库”选项中输入TNS中的IP:端口/数据库实例（经测试，此处必须这样写，否则不能正常连接）
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附图三：登录
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