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DML Tablescans

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This note is a follow-up to a recent comment a blog note about Row Migration:

So I wonder what is the difference between the two, parallel dml and serial dml with parallel scan, which makes them behave differently while working with migrated rows. Why might the strategy of serial dml with parallel scan case not work in parallel dml case? I am going to make a service request to get some clarifications but maybe I miss something obvious?

The comment also referenced a couple of MoS notes:

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