Database Engineering

Practical insights into database design, optimization, indexing, performance tuning, and data architecture gained from building and maintaining production applications.

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A Single Missing Database Index Took Our App from 120ms to 4.8s. Here’s How I Found It

Database Engineering · 12 min read

6 months ago

A Single Missing Database Index Took Our App from 120ms to 4.8s. Here’s How I Found It

This database performance issue didn’t look like a typical failure. There were no crashes, no alerts, and no obvious slow query warnings. Locally, everything felt fast, masking the missing database index that only impacted production. As traffic increased, query performance degraded, leading to rising latency and unpredictable response times. This is exactly how hidden indexing issues silently turn into major production bottlenecks.

backend scalabilitysqldatabase optimization+4 more

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