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ORA-12154: TNS:could not resolve the connect identifier specified
Cause: A connection to a database or other service was requested using a connect identifier, and the connect identifier specified could not be resolved into a connect descriptor using one of the naming methods configured. For example, if the type of connect identifier used was a net service name then the net service name could not be found in a naming method repository, or the repository could not be located or reached.
Action:
– If you are using local naming (TNSNAMES.ORA file):
– Make sure that “TNSNAMES” is listed as one of the values of the NAMES.DIRECTORY_PATH parameter in the Oracle Net profile (SQLNET.ORA)
– Verify that a TNSNAMES.ORA file exists and is in the proper directory and is accessible.
– Check that the net service name used as the connect identifier exists in the TNSNAMES.ORA file.
– Make sure there are no syntax errors anywhere in the TNSNAMES.ORA file. Look for unmatched parentheses or stray characters. Errors in a TNSNAMES.ORA file may make it unusable.
– If you are using directory naming:
– Verify that “LDAP” is listed as one of the values of the NAMES.DIRETORY_PATH parameter in the Oracle Net profile (SQLNET.ORA).
– Verify that the LDAP directory server is up and that it is accessible.
– Verify that the net service name or database name used as the connect identifier is configured in the directory.
– Verify that the default context being used is correct by specifying a fully qualified net service name or a full LDAP DN as the connect identifier
– If you are using easy connect naming:
– Verify that “EZCONNECT” is listed as one of the values of the NAMES.DIRETORY_PATH parameter in the Oracle Net profile (SQLNET.ORA).
– Make sure the host, port and service name specified are correct.
– Try enclosing the connect identifier in quote marks. See the Oracle Net Services Administrators Guide or the Oracle operating system specific guide for more information on naming.
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ORA-12154: TNS:could not resolve the connect identifier specified错误意味着无法找到指定的连接标识符，并无法打开到其指定数据库的连接。该错误可能由以下几种情况引起：
1. 未正确配置TNSnames.ora 文件：TNSnames.ora 文件是 Oracle 数据库组件中很重要的文件，用于定义数据库的连接标识符。TNSnames.ora 文件配置不当会导致 ORA-12154 错误。
2. 不支持的网络协议：如果Oracle客户端配置使用的网络协议不被服务器支持，则可能会发生ORA-12154 错误。
3. 网络代理服务器或防火墙：如果阻止了TCP / IP 数据流，也可能引起ORA-12154 错误。
4. 非法的主机名：如果主机名中含有非法字符，也可能会发生ORA-12154 错误。
5. Oracle Client版本过低：Oracle Client版本与Oracle服务器版本不匹配也可能引起ORA-12154。
正常处理方法及步骤
1、检查TNSnames.ora 文件是否正确配置，确保指定的连接标示符存在。
2、检查服务器和客户端的网络协议是否相匹配。
3、确保阻止TCP / IP 数据流的任何网络服务器或防火墙已配置正确。
4、检查主机名，如果有非法字符，更改主机名。
5、如果可能，升级客户端版本以匹配服务器上的Oracle数据库版本。
