Query Optimization Skill
Overview
Optimize SQL queries for maximum performance across different database systems.
Topics Covered
Query Analysis
- EXPLAIN plans
- Execution statistics
- Cost-based optimization
- Query profiling
- Wait event analysis
Indexing Strategy
- B-tree indexes
- Covering indexes
- Partial indexes
- Index selection
- Index maintenance
Query Patterns
- JOIN optimization
- Subquery alternatives
- Aggregate optimization
- Pagination patterns
- Bulk operations
Database Specific
- PostgreSQL optimization
- MySQL tuning
- SQL Server hints
- Oracle optimization
- Cloud DB optimization
Prerequisites
- SQL fundamentals
- Database internals basics
Learning Outcomes
- Analyze query plans
- Create effective indexes
- Rewrite slow queries
- Tune database performance