If a retail company needs to send real-time welcome emails to newly registered users, what key issue needs to be addressed regarding the database?

The key issue that needs to be addressed regarding the database for sending real-time welcome emails to newly registered users is how Marketing Cloud and the database will sync up. This is crucial because an effective integration ensures that newly registered users' information flows seamlessly from the database to the Marketing Cloud system in real time.

If the synchronization is not well-managed, there could be delays or inaccuracies in the data that affects the timely sending of these welcome emails. For instance, if the database does not update immediately when a new user registers, the Marketing Cloud may not have access to that user's information when it tries to send the welcome email, which could lead to missed opportunities or a poor user experience.

Focusing on the integration ensures that the data used for sending emails is current and reflects the latest user registrations, enabling personalized and timely communication with new users. This is a fundamental aspect of executing effective marketing campaigns and improving user engagement right from their initial interaction with the brand.