Amazon has 500 million MAU; on a given day 10% use search, issuing 5 queries each against a ~1-billion-SKU index.
Use: 1 day = 86,400 sec ≈ 10^5 sec. Powers of 10: 1 KB = 10^3 B, 1 MB = 10^6 B, 1 GB = 10^9 B, 1 TB = 10^12 B, 1 PB = 10^15 B.
Compute daily queries, average QPS, and sale-event peak.