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Dev.to
8/4/2026
The original title is: "Diagnosing and fixing MongoDB latency spikes with profiler and ESR-indexing"

The original title is: "Diagnosing and fixing MongoDB latency spikes with profiler and ESR-indexing"

Original: The explain plan I read before the CEO called back!

Short summary

A practical walkthrough of diagnosing and fixing MongoDB latency spikes under time pressure. The author used the database profiler to identify a full collection scan on 200M documents running every five minutes, then applied the ESR (Equality-Sort-Range) rule to build a correct compound index with a partial filter expression. The fix resolved latency within six hours and the customer renewed.

  • •Used MongoDB profiler to find a scheduled aggregation scanning 200M docs with no index
  • •Applied ESR rule (Equality, Sort, Range) to build the correct compound index
  • •Partial index on active-status records reduced index size and resolved latency

Generated with AI, which can make mistakes.

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