A delivery company stores customer data in a delivery database and a customer relationship database. When a customer changes their shipping address, the change is not reflected in the delivery database. This leads to the shipments being delivered to the wrong address. What data integrity problem does this scenario describe?

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When data exists in more than one database, keeping them aligned requires replication. Here, updating a customer's address in the CRM isn’t propagated to the delivery database, so the two records disagree. That disagreement leads to shipments going to the wrong address, showing data out of sync across systems. The issue is a lack of replication causing the copies of the data to diverge, which is why replication is the best description of the problem.