Database Optimization: From 10 Seconds to 100ms

# Database Optimization: From 10 Seconds to 100ms When dashboards take 10 seconds to load, users leave. Here's how we transformed our database performance through systematic optimization... ## Understanding the Problem Before optimizing, you need to measure. We used EXPLAIN ANALYZE religiously to understand query execution plans... ## Indexing Strategies The right indexes can make or break performance. Composite indexes, partial indexes, and covering indexes each have their place... ## Query Refactoring Sometimes the query itself is the problem. Moving from N+1 queries to batch fetching, using CTEs for complex logic... ## Caching Layer Not everything needs to hit the database. Redis caching with smart invalidation strategies...