Shopify App Database Optimization: What Breaks at Scale and How to Fix It

Short summary

Multi-tenant Shopify apps typically degrade at 5,000+ merchants due to database bottlenecks, not application servers. Prevent failures with composite indexes on shop_id, connection pooling, JOIN queries instead of N+1 patterns, routing reads to replicas, and Redis caching. For extreme scale, implement shop_id sharding.

• •Use composite indexes with shop_id as leftmost column to eliminate index misses on multi-tenant queries
• •Implement connection pooling and read replica routing to separate reporting load from primary writes
• •Replace N+1 query patterns with JOINs and add Redis caching for frequently accessed data like shop configurations

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