We have our salesforce org and Markting cloud integrated using Marketing Cloud Connect. An automation runs in SFMC to load records into a data extension (nearly 1M to 1.5M contact records flagged for updates) that need to be updated in Service cloud contact object.
Can I use journey builder (invoked when automation is complete) for this purpose by providing the DE as an entry source for the journey and subsequently use Salesforce (contact) object activity to update the records in service cloud on a nightly basis?
I did a POC and it worked but my only concern is about the volume of data we are going to update, which is in the range of 1M-2M. Let me know if this is a viable option?