Oracle : Ошибка ORA-16629

"database reports a different protection level from the protection mode"
*Cause: The current database protection level was different from the
configured protection mode. This typically was caused by redo
transport problems, or the primary database was not open.
*Action: Check the database alert logs and Data Guard broker logs
for more details. Also, check the redo transport status. Ensure
that one standby database supports the configured protection
mode and that the network to that standby database is working
properly. Ensure the primary database is open.

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