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MongoDB Index Fix Resolved Enterprise Latency Crisis Before CEO Call

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A major enterprise customer experienced severe database latency spikes severe enough to escalate the issue commercially, reaching the CEO before the engineering team was notified. With roughly 20 minutes before a leadership call, the engineer used MongoDB's profiler to identify a scheduled aggregation query scanning 200 million documents every five minutes without any index support. Applying the ESR (Equality, Sort, Range) rule, a partial index was created targeting only active records, reducing index size and improving query performance. The fix was deployed the same day, and latency returned to normal within six hours of the initial escalation. The customer ultimately renewed their contract, and the engineer later delivered a database health report in place of an apology.

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MongoDB Index Fix Resolved Enterprise Latency Crisis Before CEO Call · ShortSingh