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Optimize database performance with indexes. Strategies: 1. Index foreign keys. 2. Composite indexes for multi-column queries. 3. Covering indexes to avoid table lookups. 4. Partial indexes for filtered queries. 5. Monitor query plans (EXPLAIN). 6. Avoid over-indexing (write performance). 7. Index selectivity matters. 8. Regular index maintenance. Use for WHERE, JOIN, ORDER BY. Not for small tables or high-write scenarios.