The Oracle client code uses one of three ways to look up connect data: While it can be frustrating to see this error when you’re working on an application, the fix is relatively straightforward.

You’ll typically see this error in the Oracle client application during the connection process, not the server itself.

The program is not using a fully qualified service name, but no default domain is enabled in sqlnet.oraīecause there is more than one cause of the ORA-12154 error, you need to troubleshoot precisely what’s going on with your database connections.

The program is using tnsnames.ora from the wrong ORACLE_HOME.

Inability to connect to the repository due to unplanned server and network outages.

In some Oracle database versions, this error may be called “ORA-12154: TNS:could not resolve service name.” The connect identifier is not able to resolve and may be caused by one or more of the following issues: When this occurs, there’s an issue with creating a connection with one of your Oracle services or database instances. The “ORA-12154: TNS:could not resolve the connect identifier specified” Oracle error is a commonly seen message for database administrators.

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