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[Redis] Redis memory eight elimination strategies

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Posted on 7/12/2023 9:08:41 PM | | |
Redis can passmaxmemory parameter to limit memory usage, the default value is 0, which means that the use of memory is not restricted. When the data memory reaches maxmemory, the redis memory retirement policy is triggered. This parameter is usually set to three-quarters of its physical memory.

Redis MISCONF Redis is configured to save RDB snapshots
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Common unit configurations

maxmemory 100 bare number case: The unit is bytes.
maxmemory 1K K: represents 1000 bytes.
maxmemory 1KB KB: represents 1024 bytes.
maxmemory 1M M: represents 1,000,000 bytes.
maxmemory 1MB MB: Represents 1048576 bytes.
maxmemory 1G G: represents 1000000000 bytes.
maxmemory 1GB GB: represents 1073741824 bytes.
The maxmemory parameter to limit redis maximum memory is generally used in conjunction with the maxmemory-policy memory retirement policy.

maxmemory-policy eight elimination strategies

  • noeviction:( after installationDefault policyWhen the memory usage exceeds the configuration, an error is returned and no keys are evicted.
  • allkeys-lru:(commonly used) when adding keys, if the limit is exceeded, the LRU algorithm is first used to expel the keys that have not been used for a long time.
  • volatile-lru: If the limit is exceeded when adding keys, first expel the keys that have not been used for a long time from the set of keys with an expiration time.
  • allkeys-random: If the limit is exceeded when adding keys, it will be randomly deleted from all keys.
  • volatile-random: If the limit is exceeded when adding keys, it will be randomly expelled from the set of expired keys.
  • volatile-ttl: Expels keys that are about to expire from keys that have an expiration time configured.
  • volatile-lfu: Expels the least frequently used key from all keys with an expiration time configured.
  • allkeys-lfu: Expels the least frequently used key from all keys


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maxmemory and maxmemory-policy can generally be configured by modifying the .config file, of course, you can also connect to the redis server and configure it through the command as follows:

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