Oracle : Ошибка ORA-16757


"unable to get this property's value"
*Cause: The Data Guard broker failed to get the value for the specified
property, possibly because the specified property's value is
not available for the current database role.
*Action: If the specified property's value is not available for the
database's current role, please specify this property for a
database for which it is available. Otherwise, check the
Data Guard broker log for more details.

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