How to fix the error ORA-00304: requested INSTANCE_NUMBER is busy?

In this post, you’ll learn more about the Oracle ErrorORA-00304: requested INSTANCE_NUMBER is busy with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-00304: requested INSTANCE_NUMBER is busy

Reason for the Error ORA-00304: requested INSTANCE_NUMBER is busy

An instance tried to start by using a value of the initialization parameter INSTANCE_NUMBER that is already in use.

How to fix the Error ORA-00304: requested INSTANCE_NUMBER is busy ?

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

Either a) specify another INSTANCE_NUMBER, b) shut down the running instance with this number c) wait for instance recovery to complete on the instance with this number.