Explanation References: https://docs.cloud.oracle.com/iaas/Content/Database/Tasks/migrating.htm Some of the characteristics and factors to consider when choosing a migration method are: On-premises database versionDatabase service database versionOn-premises host operating system and versionOn-premises database character setQuantity of data, including indexesData types used in the on-premises databaseStorage for data stagingAcceptable length of system outageNetwork bandwidth