Redis Memory Hunt: From Black Box to Full Visibility
Redis memory spike? 90%→crash. 3-step check, 4 fixes, 1 script. Keep usage <70% and sleep well.
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When Redis memory usage soars above 90%, your application may face response delays, command timeouts, or even service crashes. Today, we’ll dive deep into Redis memory’s “black hole” and master a complete memory troubleshooting methodology.
Phase 1: Quick Overview of Memory Consumption
1. Three Essential Diagnostic Commands
# Check Redis overall memory status
redis-cli info memory
used_memory: Memory allocated by Redis allocator
used_memory_rss: Memory usage as seen by the operating system
mem_fragmentation_ratio: Memory fragmentation ratio (alert if > 1.5)
used_memory_dataset: Memory occupied by actual data
# View memory distribution by data type
redis-cli --bigkeys
# Real-time memory monitoring
redis-cli --stat
