Using Multiple Indexes on a Database Table

"I view it as an extension of Uncle Bob's," he says. "If you have like one system that's the source of truth, the system of record for the data, but then to your example, you have the products in a search engine and that's just coincidental." It's not a true copy at that point,. But if you basically had the exact same data in one data store  that could be used by different departments or customers... I don't know what it is this desire not to copy data into multiple different types of systems".