How to fix the Oracle error ORA-01615: instance string (thread string) is mounted – cannot disable?

In this post, you’ll learn more about the Oracle ErrorORA-01615: instance string (thread string) is mounted – cannot disable with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-01615: instance string (thread string) is mounted – cannot disable

Reason for the Error ORA-01615: instance string (thread string) is mounted – cannot disable

Some instance, possibly this one, has allocated the thread for its use. The thread can not be disabled while in use.

How to fix the Error ORA-01615: instance string (thread string) is mounted – cannot disable ?

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

Shut the instance down cleany using the thread.