How many keys can redis store?

Redis is a high-performance key-value database. The emergence of redis has largely compensated for the shortcomings of key/value storage such as memcached, and can play a very good supplementary role to relational databases in some situations. It provides Java, C/C, C#, PHP, JavaScript, Perl, Object-C, Python, Ruby, Erlang and other clients, which is very convenient to use.

#How many keys can redis store?

Officially said that a single instance can handle 250 million keys, reference link: https://redis.io/topics/faq, the following is the original words:

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.

Recommended Manual：Redis Command Operation Chinese Manual

The storage capacity of different data types will be different:

Original address: https://redis.io/topics/data-types

Strings type: A String type value can store up to 512M

Lists type: The maximum number of elements in the list is 2^32-1, which is 4294967295.

Sets type: The maximum number of elements is 2^32-1, which is 4294967295.

Hashes type: The maximum number of key-value pairs is 2^32-1, which is 4294967295.

Sorted sets type: similar to Sets type.

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