Oracle : Ошибка ORA-16656

16656, 0000, "Data Guard broker detected role change"
*Cause: The Data Guard broker detected a role during database startup or
health check.
*Action: Additional information about this failure is recorded in the
Data Guard broker log files, one for the primary database and
one for each standby database in the Data Guard configuration. This
information is helpful in determining how best to proceed from
this failure.

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