Database Indexing Strategies: A Complete Guide for 2025

Indexes: The Key to Performance

Proper indexing can turn a 10-second query into 10 milliseconds.

Index Types

• B-Tree: Default, best for equality and range queries
• Hash: Exact equality only
• GIN: Arrays, JSONB, full-text search
• Composite: Multiple columns, order matters

Best Practices

1. Index based on actual query patterns
2. Use EXPLAIN to verify index usage
3. Don't over-index (slows writes)
4. Consider partial indexes for filtered data
5. Use covering indexes for read-heavy queries

Explore database tools in our Tools directory.