I've got three main data extensions. I have a query that segments subscribers and puts them into a separate data extension which is designated as the entry source for the journey. The journey has decision splits that point to the source data extension(s).
Here's my question - what are the impacts in terms of journey behavior if these three data extensions are overwritten on a daily basis (the overwrite will contain the same data and any additional records that might have been added). By the way, the alternative is to do an add/update on these three data extensions to update the data, and if that's the route I need to take, that's fine.
My initial thoughts are around "
_CustomObjectKey" and how that affects journey behavior because the new data in these overwritten data extensions will all have new
_CustomObjectKey(s). Does this matter? High water mark issues? Thoughts here?