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Fix Slow MongoDB Queries: explain(), Indexes and the ESR Rule

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-19

Tuning MongoDB queries: explain executionStats, COLLSCAN vs IXSCAN, totalDocsExamined vs returned, compound index order with ESR, covered queries, regex and $or pitfalls, the profiler, pagination and document growth issues.

A MongoDB query scans the whole collection. Use explain to see COLLSCAN, build compound indexes with the Equality-Sort-Range rule, and avoid unbounded arrays and skip-based paging.

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#mongodb#indexes#explain#performance#nosql

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