ORA-00304: requested INSTANCE_NUMBER is busy


Oracle/PLSQL: ORA-00304

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:

Option #1

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

Option #2

Wait for recovery to finish for that instance number.

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