'''[http://redis.io/%|%Redis]''', by [SS], is an in-memory data structure store. ** Attributes ** &| Website | http://redis.io |& &| Repository | https://github.com/redis/redis |& &| Latest release | 6.0.8 |& &| Release time | 2020-09-10 |& &| License | BSD (3-clause). |& &| Maintainer | The Redis core team. |& [SS] http://antirez.com/news/133%|%stepped down%|% as the maintainer of Redis in June 2020. ** See Also ** [StarStore]: A Redis-like API for [Metakit]. ** Description ** Redis is an in-memory data structure store that persists on disk. The data model is key-value, but many different kinds of values are supported: Strings, Lists, Sets, Sorted Sets, Hashes. It is somewhat like [Memcached], but persistent. Redis is implemented in C with a test suite written in Tcl. The test suite includes a Tcl https://github.com/antirez/redis/blob/unstable/tests/support/redis.tcl%|%client library%|%. The first version of Redis, then called "LMDB" (unrelated to [LMDB]), was itself implemented in Tcl. [SS] has published its source code as a https://gist.github.com/antirez/6ca04dd191bdb82aad9fb241013e88a8%|%Gist%|% on [GitHub]. ** Retcl ** [https://github.com/gahr/retcl%|%Retcl] is an event-driven, object-oriented, Redis client library targeting the Tcl scripting language. Things that Retcl does which are missing in Salvatore's client are: * Pub/Sub support * Callbacks specified per subscription pattern / channel * Configurable results cache * Global and per-command sync / async modes * User-defined error handler ** Redis and Jim Tcl ** You can find a basic Redis client library for [Jim Tcl] (which was originally another project of antirez) in [jimhttp]. The library also works in Tcl 8.6 or later. <> Caching | Database