ORA-00304: requested INSTANCE_NUMBER is busy



ORA-00304: requested INSTANCE_NUMBER is busy..

Answer / guest

Cause: An instance tried to start by using a value of the
initialization parameter INSTANCE_NUMBER that is already in use.

Action: Either a) specify another INSTANCE_NUMBER, b) shut
down the running instance with this number c) wait for
instance recovery to complete on the instance with this number.

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