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Hi ,
have you looked at the DMS logs for the task?
AWS DMS restarts table loading from the beginning when it hasn't finished the initial load of a table. When a task is restarted, AWS DMS reloads tables from the beginning when the initial load didn't complete.
As described here.
The recoverable error count is by default -1 (restart indefinitely) so if any error happens the task might restart and reload all the tables. With no PK enforcing (as in Redshift) you will see the duplicates.
hope this helps
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