Learn the cause and how to resolve the ORA-00304 error message in Oracle.
When you encounter an ORA-00304 error, the following error message will appear:
- ORA-00304: requested INSTANCE_NUMBER is busy
You tried to start an Oracle instance by using an INSTANCE_NUMBER parameter value that is already in use.
The option(s) to resolve this Oracle error are:
Modify the INSTANCE_NUMBER initialization parameter in the initialization file to use another number. Then try restarting the instance.
Wait for recovery to finish for that instance number.