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NoSQL Options Compared

, March 19, 2013 A Developer's Look at the Primary NoSQL Options
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Redis

Developer Salvatore Sanfilippo
License Type BSD Open Source
Operating System Linux, Mac OS X
Implementation Language C
Initial Release 2009

Redis is primarily an in-memory database. While it does have some capability for persisting data to disk, its primary use is as a blazingly fast in-memory product. While it uses a key-value model, Redis should not be confused for a simple in-memory cache, although it does enable expiration to be set for data items, as would a cache. Redis supports in-memory transactions, master-slave replication, and even pub/sub capabilities. The replication scheme permits a slave to be a master to other slaves, and so on, thereby enabling an extensive replication tree with a single root.

Redis is best used where fast access to data that need not be retained is important, such as stock quotations and other short-lived data.

Redis has many language bindings and supports Lua as a scripting language. It is written in ANSI C, so it should be portable to most platforms. However, the product is not officially supported on Microsoft Windows.






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