How do I monitor indexes in production?
Watch slow queries with the MongoDB profiler or your APM. Add indexes as query patterns emerge. Drop indexes that are not used (every index adds write overhead). Migrate as the app evolves. Do not assume your indexes are perfect.
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More FAQs in MongoDB Indexing Roadmap for Node.js Developers
Understand why, single-field indexes, unique indexes, compound indexes (prefix and ESR rules), explain(), .lean() and .select(), cursor-based pagination, text indexes, TTL indexes, index tradeoffs, and monitoring in production.
Why they matter. Without indexes, MongoDB scans every document. For small collections, fine; for large, slow. Indexes are how you scale reads. Then learn single-field indexes and verify with explain().
After single-field and unique indexes. Compound indexes are for multi-field queries. Learn the prefix rule (A, B, C serves A, A+B, A+B+C) and the ESR rule (equality, sort, range) for ordering fields.
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