2021-12-20 [redis] redis配置中的save引起rdb快照生成的规则

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已于 2022-11-22 16:51:10 修改

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分类专栏： redis 文章标签： redis 缓存数据库

于 2021-12-20 17:32:04 首次发布

本文链接：https://blog.youkuaiyun.com/adofsauron/article/details/122046243

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本文详细分析了Redis配置中的`save`参数如何触发RDB快照生成。根据`save`设置的周期和key变动次数，当特定周期内key变化达到指定次数，才会触发RDB快照。测试表明，即使key变动数量未达到，也会在下一个周期累积，只有在周期结束时，若满足条件才会生成RDB。

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摘要:

分析redis配置中的save, 具体是以何种规则来触发生成rdb.

redis配置中的注释:

#
# Save the DB on disk:
#
#   save <seconds> <changes>
#
#   Will save the DB if both the given number of seconds and the given
#   number of write operations against the DB occurred.
#
#   In the example below the behaviour will be to save:
#   after 900 sec (15 min) if at least 1 key changed
#   after 300 sec (5 min) if at least 10 keys changed
#   after 60 sec if at least 10000 keys changed
#
#   Note: you can disable saving completely by commenting out all "save" lines.
#
#   It is also possible to remove all

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