dbaplus Community

Apr 23, 2025 · Databases

Why Redis Used Memory Jumped to 78 GB and How to Diagnose It

A Redis instance suddenly reported 78.9 GB of used_memory against a 16 GB maxmemory limit, triggering massive key eviction; this article explains how INFO reports used_memory, what the metric actually measures, how Redis 7 changes memory accounting, the exact eviction conditions, and provides a Python script to pinpoint the memory‑hogs.