Based on a SQLException how to know if the database is down?

Hi
How can I know based on a SQLException that the database is down?. I know I can check the errorCode but which error codes indicate that the database is DOWN or not available?
Regards,
Néstor Boscán

If the SQLException is IO exception: Connection refused, one of the causes is that the database instance has not been started. If the SQLException is
IO exception: The Network Adapter could not establish the connection., one of the causes is that the database TNSListener has not been started.

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Based on a SQLException how to know if the database is down?

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