How to set the maximum memory occupied by redis

Setting method:

(Learning video sharing: redis video tutorial)

Redis settings occupy a physical machine Maximum memory

#占用最大20G
maxmemory 20480mb

Redis setting memory cannot be loaded, limited deletion is about to expire.

When the currently used memory exceeds the maxmemory limit, the active cleanup policy is triggered

• volatile-lru: Only perform LRU on keys with an expiration time set (default value)

• allkeys-lru: Delete the lru algorithm's

• keyvolatile-random: Random deletion is about to expire

• keyallkeys-random: Randomly delete

• ##volatile-ttl: Delete the soon-to-expire

• noeviction: Never expire, return error when mem_used memory The setting of maxmemory has been exceeded. For all read and write requests

#超过后删除即将过期的
maxmemory-policy  volatile-ttl

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