2. eBay Marketplaces 97 million active buyers and sellers 200+ million items 2 billion page views each day 80 billion database calls each day 5+ petabytes of site storage capacity 80+ petabytes of analytics storage capacity 2 3. How do we scale databases? Shard – Patterns: Modulus, lookup-based, range, etc. – Application sees only logical shard/database Replicate – Disaster recover