Datafile was dropped or renamed?

Hi,
suppose an OS admin dropped or renamed one datafile by accident(in UNIX).
What is the quickest way to know this event happened?
Thanks,

Once the database attempts to write the file a message will be generated stating that the file no longer existsUnder Unix, this is only true if the Oracle instance is closing the file and is trying to re-open it because Unix kernel keep the internal file descriptor open until the[u] last process using the file is closing it, even if the file has been removed by another process.
I think it's unlikely that the database instance is opening and closing control files, datafiles after database startup and before database shutdown.

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