Redis is an open-source (BSD licensed), in-memory data structure store, used as a database, cache, and message broker. Redis provides data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs, geospatial indexes, and streams. Redis has built-in replication, Lua scripting, LRU eviction, transactions, and different levels of on-disk persistence, and provides high availability via Redis Sentinel and automatic partitioning with Redis Cluster. You can run atomic operations on these types, like appending to a string; incrementing the value in a hash; pushing an element to a list; computing set intersection, union and difference; or getting the member with highest ranking in a sorted set. To achieve top performance, Redis works with an in-memory dataset. Depending on your use case, you can persist your data either by periodically dumping the dataset to disk or by appending each command to a disk-based log.
Features
- Many different kind of values are supported
- Strings, Lists, Sets, Sorted Sets, Hashes, Streams, HyperLogLogs, Bitmaps, etc.
- You can disable persistence if you just need a feature-rich, networked, in-memory cache
- Redis supports asynchronous replication
- Very fast non-blocking first synchronization, auto-reconnection with partial resynchronization on net split
- Keys with a limited time-to-live