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I used Oracle Zero Downtime Migration Tool to move some databases from OnPrem Exadata to a freshly instantiated OCI Exadata Cloud Service (Quarter Rack to be more precise). I found out then, that the speed and performance of backup and restore to OCI Object Store was more than catastrophical. Instead of advertised ~2,5h for a 5 TB big database over 8 channels, the restore took… more than 20 hours! The backup was not as fast…