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Name change reflects the central role the company maintains in leading the evolution of open source Redis from a popular caching system into the leading real-time data platform Mountain View, August 11, 2021—Today, Redis Labs announced the company is now registered as Redis, dropping “Labs” from its name. The change signals the maturation of the company and the Redis open source project, which it
Download the JSON Web Tokens (JWTs) are not safe e-book here Sometimes, people take technologies that are intended to solve a narrow problem and start applying them broadly. The problem may appear similar, but utilizing unique technologies to solve general issues could create unanticipated consequences. To use a metaphor, if you are a hammer, everything looks like a nail. JWT is one such technolog
Click here to get started with Redis Enterprise. Redis Enterprise lets you work with any real-time data at any scale, anywhere. Your scientists were so preoccupied with whether or not they could, they didn’t stop to think if they should.—Dr. Ian Malcolm, in Jurassic Park “Best Practices” has become a trope in technology. Sure, you can do something with a given tool, but is doing so really a good i
Server-assisted, client-side caching in Redis Client-side caching is a technique used to create high performance services. It exploits the memory available on application servers, servers that are usually distinct computers compared to the database nodes, to store some subset of the database information directly in the application side. Normally when data is required, the application servers ask t
It’s that time of the year again. No, I’m not referring to the winter holidays, but to the reverberations of the announcements coming out of AWS re:Invent. Oftentimes when AWS makes a big move, IT ecosystems get shaken. In the database space, this year the effect focused on Apache Cassandra, after AWS announced a Cassandra-compatible serverless managed solution. Along with the announcement, AWS al
JSON support for Redis The JSON capability of Redis Stack provides JavaScript Object Notation (JSON) support for Redis. It lets you store, update, and retrieve JSON values in a Redis database, similar to any other Redis data type. Redis JSON also works seamlessly with Search and Query to let you index and query JSON documents. Primary features Full support for the JSON standard A JSONPath syntax f
Click to learn more about RediSearch: RediSearch: A High Performance Search Engine as a Redis Module white paper Background RediSearch is a distributed full-text search and aggregation engine built as a module on top of Redis. It enables users to execute complex search queries on their Redis dataset in an extremely fast manner. The unique architecture of RediSearch, which was written in C and bui
EXPIRE key seconds [NX | XX | GT | LT] Available since: 1.0.0 Time complexity: O(1) ACL categories: @keyspace, @write, @fast, Set a timeout on key. After the timeout has expired, the key will automatically be deleted. A key with an associated timeout is often said to be volatile in Redis terminology. The timeout will only be cleared by commands that delete or overwrite the contents of the key, inc
Since the recent licensing change for our Redis modules, there’s been a lot of confusion and misinformation circulating about the implications of those changes. We want to address your questions and be crystal clear: the license for open source Redis was never changed. It is BSD and will always remain BSD. So what has changed? We recently did change the license for Redis modules developed by Redis
FAQs Why are you offering a dual license strategy? We believe the permissive approach of RSALv2 and the standard wording we use to define its limitations solves many of the challenges raised by our community, but we are also aware that, like any newly created license, it will take time for some users (and their legal teams) to digest it and therefore we’ve added an option to use SSPL. Created by M
Introduction to Redis streams A Redis stream is a data structure that acts like an append-only log but also implements several operations to overcome some of the limits of a typical append-only log. These include random access in O(1) time and complex consumption strategies, such as consumer groups. You can use streams to record and simultaneously syndicate events in real time. Examples of Redis s
RedisGraph is the first queryable Property Graph database to use sparse matrices to represent the adjacency matrix in graphs and linear algebra to query the graph. Primary features Based on the Property Graph Model Nodes (vertices) and Relationships (edges) that may have attributes Nodes that can be labeled Relationships have a relationship type Graphs represented as sparse adjacency matrices Cyph
For those of you familiar with Redis, it should be relatively straightforward to create a configuration that guarantees ACID-ish (Atomicity, Consistency, Isolation, Durability) operations: merely create a single Redis instance with a ‘master’ role and have it configured with AOF every write (‘appendfsync always’) to a persistent storage device. This configuration provides ACID characteristics in t
Introduction to writing Redis modules The modules documentation is composed of the following pages: Introduction to Redis modules (this file). An overview about Redis Modules system and API. It's a good idea to start your reading here. Implementing native data types covers the implementation of native data types into modules. Blocking operations shows how to write blocking commands that will not r
Overview of redis-cli, the Redis command line interface In interactive mode, redis-cli has basic line editing capabilities to provide a familiar typing experience. To launch the program in special modes, you can use several options, including: Simulate a replica and print the replication stream it receives from the primary. Check the latency of a Redis server and display statistics. Request ASCII-
Searching and querying Redis data Redis Stack offers an enhanced Redis experience via the following search and query features: A rich query language Incremental indexing on JSON and hash documents Vector search Full-text search Geospatial queries Aggregations You can find a complete list of features in the reference documentation. The search and query features of Redis Stack allow you to use Redis
Redis modules are bundled and packaged as part of Redis Enterprise Software. Download the modules (including RedisJSON) to upgrade Redis Enterprise Software with the latest module version. Ready to jump right into RedisJSON? Check out Getting Started with RedisJSON on the Redis Developer site! —— RedisJSON is a Redis module that provides native JSON capabilities—simply run the Docker Image for Red
A distributed lock pattern with Redis Distributed locks are a very useful primitive in many environments where different processes must operate with shared resources in a mutually exclusive way. There are a number of libraries and blog posts describing how to implement a DLM (Distributed Lock Manager) with Redis, but every library uses a different approach, and many use a simple approach with lowe
High availability for non-clustered Redis Redis Sentinel provides high availability for Redis when not using Redis Cluster. Redis Sentinel also provides other collateral tasks such as monitoring, notifications and acts as a configuration provider for clients. This is the full list of Sentinel capabilities at a macroscopic level (i.e. the big picture): Monitoring. Sentinel constantly checks if your
Redis modules are add-ons to Redis that extend Redis to cover most popular use cases in a wide variety of industries. They seamlessly plug into Redis, are processed in-memory, and provide Redis’ simplicity, super high performance, scalability, and high availability. Modules can be created by anyone. With Redis modules you adapt your database to your data rather than the other way around. Use Redi
EVAL script numkeys [key [key ...]] [arg [arg ...]] Available since: 2.6.0 Time complexity: Depends on the script that is executed. ACL categories: @slow, @scripting, Invoke the execution of a server-side Lua script. The first argument is the script's source code. Scripts are written in Lua and executed by the embedded Lua 5.1 interpreter in Redis. The second argument is the number of input key na
Discovering slow server events in Redis Redis is often used for demanding use cases, where it serves a large number of queries per second per instance, but also has strict latency requirements for the average response time and the worst-case latency. While Redis is an in-memory system, it deals with the operating system in different ways, for example, in the context of persisting to disk. Moreover
MONITOR Available since: 1.0.0 Time complexity: ACL categories: @admin, @slow, @dangerous, MONITOR is a debugging command that streams back every command processed by the Redis server. It can help in understanding what is happening to the database. This command can both be used via redis-cli and via telnet. The ability to see all the requests processed by the server is useful in order to spot bugs
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How to index and search JSON documents In addition to indexing Redis hashes, Redis Stack can also index JSON documents. Prerequisites Before you can index and search JSON documents, you need a database with either: Redis Stack, which automatically includes JSON and searching and querying features Redis v6.x or later with the following modules installed and enabled: RediSearch v2.2 or later RedisJS
Overview of Redis key eviction policies (LRU, LFU, etc.) When Redis is used as a cache, it is often convenient to let it automatically evict old data as you add new data. This behavior is well known in the developer community, since it is the default behavior for the popular memcached system. This page covers the more general topic of the Redis maxmemory directive used to limit the memory usage to
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