問題文
A logistics company keeps shipment records as details of a route, with a roll-up summary on the route that sums the shipment weights. On the busiest routes each nightly load touches tens of thousands of shipments, and the load has become slow. What is the honest assessment of the roll-up summary here?
選択肢
- It is recalculated only when someone opens the route record, so the nightly load itself is unaffected and the slowness must come from something else entirely then.
- It is recalculated as part of saving, and updating the parent sends that parent through the save procedure again, so any automation on the route runs as well; Salesforce advises staying under 10,000 detail records per parent.
- It is cheap because the value is stored, and the only real cost is the disk space that it takes up on the route record itself each day.
- It should be replaced with a trigger on the shipment that updates the route, because hand-written Apex can decide to skip the recalculation when the weight has not changed and therefore costs less.