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Redis is completely free open source, BSD comply with the agreement, it is a high-performance key-value database.
Redis with other key - value caching product has the following three features:
Redis has a more complex data structures and provide atomic operations on them, which is a different evolutionary path to another database. Meanwhile Redis data types are based on the basic data structure transparent to the programmer, without the need for additional abstraction.
Redis running in memory but can be persisted to disk, so the different data sets need to weigh speed read and write memory, the data should not be greater than the amount of hardware memory. Another advantage of in-memory databases is compared on the same disk of complex data structures, operate in memory it is very simple, so you can do a lot of internal Redis highly complex matter. Meanwhile, they are in terms of a compact disk format appending to produce, because they do not require random access.