(Feature of redis - unique key-value pair model)
Many databases can only handle one data structure:
SQL Database - Table
Memcached - database of key-value pairs, both keys and values are strings
Document databases (CouchDB, MongoDB) - documents consisting of JSON/BJSON
Once the data structure provided by the database is not suitable for doing a certain thing, the program will be very troublesome and unnatural to write.
Redis is also a key-value pair database, but unlike Memcached, the value of Redis can be not only a string, but also any of the other five data structures (string, list, hash, set, ordered set) . By choosing different data structures, users can use Redis to solve a variety of problems.
(redis has rich additional functions)
