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6a · Redis & Valkey — Fundamentals

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Cache and sessions kept apart, the eviction policy each one needs, and reading INFO and SLOWLOG.

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1. Which eviction policy belongs on the sessions instance, and why?
noeviction — a full instance refuses writes loudly instead of silently logging customers out allkeys-lru, so the oldest sessions go first volatile-ttl, to expire sessions early Any of them — sessions can be regenerated
2. Which command does the episode say never to run, pointing you at bin/magento cache:flush instead?
FLUSHALL INFO DBSIZE SLOWLOG GET
3. Applied: latency spikes across every request on one Valkey instance. What is the usual culprit?
A KEYS command blocking the single thread Too many replicas An AOF rewrite allkeys-lru evicting the cache