redis能存多少个key

redis能存多少个key？

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.

不同的数据类型存储量会有差异：

原文地址：https://redis.io/topics/data-types

Strings类型：一个String类型的value最大可以存储512M

Lists类型：list的元素个数最多为2^32-1个，也就是4294967295个。

Sets类型：元素个数最多为2^32-1个，也就是4294967295个。

Hashes类型：键值对个数最多为2^32-1个，也就是4294967295个。

Sorted sets类型：跟Sets类型相似。