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• What are database migrations
• Challenges with database migrations
  • Successfully migrating existing data
  • Making changes reversible
  • Testing schema changes
  • Performance and availability impact
• Strategies
  • Planned maintenance: upgrading schemas with downtime
  • Blue/Green Deployment
  • Feature Flags
  • Canary Releases
• Expand and contract pattern
• Hitch Hiker's Guide to Schema Migration
  • Avoid destructive change. Instead, always aim for additive schema change
  • Follow the convention
  • Balance database normalization until it hurts. (Then relax)
  • Thou shall write tests