Summary
- Master SQL query optimization, indexing strategies, and EXPLAIN analysis to eliminate slow queries.
- Covers EXPLAIN plan analysis with key metrics (Seq Scan, Index Scan, cost, rows, execution time) and five index types (B-Tree, Hash, GIN, GiST, BRIN) for different query patterns Includes five core optimization patterns: eliminating N+1 queries, cursor-based pagination, efficient aggregation, subquery transformation, and batch operations Provides advanced techniques like materialized views, table partitioning, and query hints for large-scale performance tuning Includes monitoring queries to identify slow queries, missing indexes, and unused indexes in PostgreSQL