Resolve ORA-00304 Error Message in Oracle

Learn the motive and how to resolve the ORA-00304 error message in Oracle.


When you come upon an ORA-00304 error, the following error message will appear:

ORA-00304: requested INSTANCE_NUMBER is busy


You tried to start an Oracle occasion via using an INSTANCE_NUMBER parameter cost that is already in use.


The option(s) to resolve this Oracle error are:

Option #1

Modify the INSTANCE_NUMBER initialization parameter in the initialization file to use another number. Then attempt restarting the instance.

Option #2

Wait for recuperation to end for that occasion number.