redis一个实例能存多少key，key与value最大是多少？

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官方说单例能处理key：2.5亿个，参考链接:https://redis.io/topics/faq，以下是原话：

What is the maximum number of keys a single Redis instance can hold? and what the max number of elements in a Hash, List, Set, Sorted Set?
Redis can handle up to 2^32 keys, and was tested in practice to handle at least 250 million keys per instance.
Every hash, list, set, and sorted set, can hold 2^32 elements.

In other words your limit is likely the available memory in your system.

一个key或是value大小最大是512M

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