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Oracle/PLSQL: ORA-00304 Error

Error:

 ORA-00304: requested INSTANCE_NUMBER is busy

Cause:

 You tried to start an Oracle instance by using an INSTANCE_NUMBER parameter value that is already in use.

Action:

 The options to resolve this Oracle error are:
  1. Modify the INSTANCE_NUMBER initialization parameter in the initialization file to use another number. Then try restarting the instance.
  2. Wait for recovery to finish for that instance number.