問題文
A dashboard must show a customer's total exposure by pulling balances from three different systems and combining them into one figure each time it is opened. Which pattern is this?
選択肢
- The broadcast pattern, which would instead push one system's changes outward to the other systems continuously rather than pulling their data together.
- The migration pattern, which performs a single one-time bulk move of records and then stops, and so cannot serve a figure that must be recomputed every time the page is opened.
- The aggregation pattern, which retrieves data from multiple sources and combines it into a single result when it is needed.
- The correlation pattern, which synchronizes matching records in each system without merging their figures at all.