Redis

Redis is an open-source in-memory data structure store that stores data in key-value pairs. It supports various data structures such as strings, hashes, lists, sets, and more. Redis is commonly used for applications requiring high performance and low latency.

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Content type

Technology

Technical building block: can be automated, integrated, or operated.

Classification level

Element

Concrete cog in the system that works inside larger relationships.

Available perspectives

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In brief

Redis in brief

Redis is a server-side in-memory data store for keys, values, and structured data, commonly used as a cache, database, or messaging component.

Where does it come from?

Redis began in 2009 from Salvatore Sanfilippo's need for a fast real-time data store. The private project became open source; its evolution includes persistence, replication, clustering, and additional data types.

The mental model

Think of Redis as fast shared working memory accessed over a network. A key points to a data structure, commands change it atomically, and configuration can persist or replicate data.

Key building blocks

Data structures

Strings, hashes, lists, sets, sorted sets, and more express common access patterns.

Speed

Primary RAM access enables low latency, while CPU, network, and data volume remain constraints.

Persistence and replication

RDB or AOF persistence and replication affect durability, failure behavior, and operating cost.

When is it useful?

Redis suits caches, sessions, counters, queues, and real-time features. Before using it, define loss tolerance, memory limits, eviction, persistence, and availability; a fast cache is not a substitute for authoritative storage.

Redis Offizielle Dokumentation