PostgreSQL Indexing Strategies

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Why Indexes Matter

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B-Tree Indexes

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CREATE INDEX idx_users_email ON users(email);

When to Use

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• Equality comparisons
• Range queries
• Sorting

Hash Indexes

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CREATE INDEX idx_users_id_hash ON users USING hash(id);

GIN Indexes

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For JSONB

CREATE INDEX idx_data_gin ON documents USING gin(data);

For Arrays

CREATE INDEX idx_tags_gin ON posts USING gin(tags);

Partial Indexes

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CREATE INDEX idx_active_users ON users(email)
WHERE active = true;

Composite Indexes

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Column Order Matters

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Monitoring Index Usage

SELECT * FROM pg_stat_user_indexes;

Conclusion

Choose indexes based on query patterns.