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Update Contact Data Activity updates all records for a Contact

Knowledge Article Number 000213159
When you use the Update Contact Data Activity, all of the rows in the Data Extension matching the Contact Key are updated. Learn why below. 

This is functioning as designed. If an Attribute that's selected in an Update Contact Data Activity exists in a Data Extension without a Primary Key set on the Contact Key field, it'll update all of the rows matching that Contact Key. 

As a workaround, set the Contact Key field as the primary key in the Data Extension if you don't want all of the rows that match the Contact Key to update.

Note: If multiple records for the Contact Key exist in the Data Extension, the application will not allow you to set that field as the primary key. 

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