Hello
here is the stuff from metalink.....
Subject:
OERR: ORA 304 requested
INSTANCE_NUMBER is busy
Error: ORA 304
Text: requested INSTANCE_NUMBER is busy
-------------------------------------------------------------------------------
Cause: An instance tried to start by using a value of the initialization
parameter INSTANCE_NUMBER that is already in use.
Action: Specify another value for INSTANCE_NUMBER in the initialization
parameter file or wait for recovery to finish for that instance number.
Then restart the instance.

Hopr it will solve your problem
Thanks.
Thanigaivasan





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