We've tested out DMS to migrate from a 3 node Oracle RAC to Oracle RDS, and I was incredibly impressed. They list a bunch of limitations in their documentation that you should look at first. It migrated our roughly 1 TB database in two hours and ten minutes and handled replication flawlessly - not a single record discrepancy between the two database systems over a week long test. We were not expecting it to work that well and doubted that it would work with RAC as the source.
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