...
1. When you start the database instance in the operating state ONLINE, the result of the check is that the data area and the current log area have different states.
2. When the log entries are imported, the result of the check is that the import sequence is incorrect.
...
1. You must recover the database system by specifying the correct backup version.
2. Import all the necessary log entries in the correct order.
3. Transfer the database instance to the operating state ONLINE.