Learn the motive and how to resolve the ORA-00304 error message in Oracle.
Description
When you come upon an ORA-00304 error, the following error message will appear:
ORA-00304: requested INSTANCE_NUMBER is busy
Cause
You tried to start an Oracle occasion via using an INSTANCE_NUMBER parameter cost that is already in use.
Resolution
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.