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Connection error to an Oracle XE database - TNS:could not resolve the connect identifier specified


on my 64-bit machine I've installed the Oracle client/ODAC software and the Oracle Express Edition database (vers. 18c).

Using the SQL Developer I can connect to the XE cdb and the XEPDB1 pdv. Inside the XEPDB1 pdb I've created a new user/schema with some tables; inside Power Query I need to connect to this new user of XEPDB1.

Well, in PQ I've created successfully an Oracle connection to the XE cdb using SYSTEM as an user; in the tnsnames.ora file of the Oracle XE installation I've these settings:



Moreover, in PQ I've tried to create another Oracle connection to the new user/schema of the XEPDB1 pdb obtaining this error message: ORA-12154: TNS:could not resolve the connect identifier specified; in the tnsnames.ora file I've these settings:

new_user =
(PORT = 1521)
(SERVICE_NAME = new_user)


I can connect with the new user inside SQL Developer and for creating an ODBC 64-bit data source.

So, it seems that the Oracle client is installed rightly and Power BI recognizes it, but an error occurs for the new user.

Now, any suggests to me in order to solve this issue, please?

Has the new user to have some particular high permissions for the XEPDB1 database?

Many thanks

Community Support
Community Support

Hi @Anonymous ,


Sorry to disturb you.

Could you tell me if your problem has been solved?
If it is, kindly accept the useful reply as the solution. More people will benefit from it.
Or you are still confused about it, please provide me with more details about your problem.


Best Regards,
Stephen Tao

Community Support
Community Support

Hi @Anonymous ,


Here'are some solutions you can refer to:

Verify a TNSNames.ora file exists on the QuickConnect server


Set the TNS_Admin environment variable if it is not set

  • Navigate to Control Panel > System
  • Select Advanced System Settings
  • In the Advanced tab, select Environment Variables
  • Under System Variables, click New
  • In the Variable name text box, type TNS_ADMIN
  • In the Variable value text box, type the location of the TNSNames.ora file
  • Click OK to add the variable
  • Restart the server


Reference: ORA-12154: TNS:could not resolve the connect identifier specified (213860)


Also, you can refer to these articels:

ORA-12154: TNS could not resolve service name tips

How to Solve the Oracle Error ORA-12154: TNS:could not resolve the connect identifier specified

ORA-12154 could not resolve the connect identifier specified


Best Regards,

Stephen Tao


If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

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