Getting Started with Redis (collection)

CollectionA collection of Redis is an unordered collection of strings. In Redis you can add, delete, and test whether a file exists, in member O (1) time complexity. Example

redis 127.0.0.1:6379> Sadd Tutoriallist redis   (integer) 1  REDIS   

127.0.0.1:6379> Sadd tutoriallist MongoDB   redis   

127.0.0.1:6379> Sadd tutoriallist RABITMQ   redis   

127.0.0.1:6379> Sadd tutoriallist RABITMQ   redis   

127.0.0.1:6379> Smembers tutoriallist  

Note: in the example above, the RABITMQ collection is added two times, but because the collection element has a unique property.

The maximum number of elements in the collection is 2^{32-1 (4294967295, which can hold more than 4 billion elements).}

Ordered collectionan ordered collection of Redis is similar to a collection of Redis, a collection of strings that are not duplicates. The difference is that each member of an ordered set uses fractions in order to take an ordered set command, from the smallest to the largest member score. Although members are unique, the scores may be duplicated.
Example

redis 127.0.0.1:6379> Zadd Tutoriallist 0 redis   (integer) 1  REDIS   

127.0.0.1:6379> zadd tutoriallist 0 MongoDB   redis   

127.0.0.1:6379> zadd tutoriallist 0 RABITMQ   redis   

127.0.0.1:6379> zadd tutoriallist 0 RABITMQ   redis   

127.0.0.1:6379> zrangebyscore tutoriallist 0 1) "Redis" 2) "MongoDB" 3) "RABITMQ"

 


From for notes (Wiz)

Getting Started with Redis (collection)