ORA-07445

Dear all DBAs,

What is this error suppose to mean?
$oerr ora 07445

 Cause: An OS exception occurred which should result in the creation of a core file.

        This is an internal error.
 Action: Contact your customer support representative.

and
$oerr ora 1242

 Cause: The database is in NOARCHIVELOG mode and a database file was detected as

        inaccessible due to media failure.  Action: Restore accessibility to the file mentioned in the error stack and restart

         the instance.

What should i do and prevent the error mentioned above?

Thanks in advance.

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