How to fix the Oracle error NNO-00251: missing administrative region parameter string?

In this post, you’ll learn more about the Oracle ErrorNNO-00251: missing administrative region parameter string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

NNO-00251: missing administrative region parameter string

Reason for the Error NNO-00251: missing administrative region parameter string

Cause: The server’s administrative region description is missing a required parameter. This error will prevent the server from starting. The administrative region description is stored in the server’s names.ora configuration file.

How to fix the Error NNO-00251: missing administrative region parameter string ?

You can fix this error in Oracle by following the below steps

Action: Make sure that the names.admin_region parameter in names.ora is correct. The names.ora file is automatically generated by the Oracle Network Manager, but administrators can edit the file at any time, introducing errors. If the file was never changed, contact Worldwide Customer Support.