Redis Max Size of Every Type

via http://blog.sina.com.cn/s/blog_3c8ced5801012iyt.html
Strings

A String value can be at max 512 Megabytes inlength. Redis Strings are binary safe, this means that a Redisstring can contain any kind of data, for instance a JPEG image or aserialized Ruby object

Lists

The max length of a list is 2³² - 1 elements(4294967295, more than 4 billion of elements per list).

Sets

The max number of members in a set is 2³² - 1(4294967295, more than 4 billion of members per set).

Hashes

Every hash can store up to 2³² - 1 field-value pairs(more than 4 billion).

Sortedsets

Redis Sorted Sets are, similarly to Redis Sets, non repeatingcollections of Strings. The difference is that every member of aSorted Set is associated with score, that is used in order to takethe sorted set ordered, from the smallest to the greatest score.While members are unique, scores may be repeated.

 

 

What is the maximum number ofkeys a single Redis instance can hold? and what the max number ofelements in a List, Set, Ordered Set?

In theory Redis can handle up to2^32 (4 bilions)keys, and was tested in practice to handle at least250 million of keys per instance. We are working in order toexperiment with larger values.

Every list, set, and ordered set,can hold 2^32 elements.

In other words your limit islikely the available memory in your system.

 

http://redis.io/topics/faq

http://redis.io/topics/data-types