Redis is completely open source and free. It is an open source log-type Key-Value database written in ANSIC language, abiding by the BSD protocol, supporting the network, memory-based and persistent, and providing APIs in multiple languages.
REmote DIctionary Server (Redis) is a key-value storage system written by Salvatore Sanfilippo.
Redis and other key-value caching products have the following three characteristics:
Redis supports data persistence and can save data in memory to disk. It can be loaded again for use when restarting. Redis not only supports simple key-value type data, but also provides storage of data structures such as list, set, zset, and hash. Redis supports data backup, that is, data backup in master-slave mode.
Redis Advantages
Extremely high performance – Redis can read at a speed of 110,000 times/s and write at a speed of 81,000 times/s.
Rich data types – Redis supports Strings, Lists, Hashes, Sets and Ordered Sets data type operations for binary cases.
Atomic - All Redis operations are atomic, meaning they are either executed successfully or not executed at all. Individual operations are atomic. Multiple operations also support transactions, that is, atomicity, wrapped by the MULTI and EXEC instructions.
Rich features – Redis also supports publish/subscribe, notifications, key expiration and other features.
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