How to fix the Oracle error ORA-01639: instance string has no thread assigned to it?

In this post, you’ll learn more about the Oracle ErrorORA-01639: instance string has no thread assigned to it with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-01639: instance string has no thread assigned to it

Reason for the Error ORA-01639: instance string has no thread assigned to it

There is no mapping from instance to thread for this instance in the control file.

How to fix the Error ORA-01639: instance string has no thread assigned to it ?

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

Make sure that this instance has a thread assigned to it by adding logfiles to this instance or by starting the instance with an existing thread which will automatically create a mapping.