IT Services Circle
Jun 11, 2025 · Databases
How to Count 100 Million Redis Keys Efficiently Without Crashing the Cluster
This article explains why the KEYS * command is dangerous for large Redis deployments and presents several practical alternatives—including SCAN, multithreaded SCAN, cluster‑wide parallel scans, built‑in counters, and real‑time incremental counting—along with code samples, performance comparisons, and guidance on choosing the right solution.
ClusterKey CountingPerformance
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