Redis is an open source, in-memory, key-value data store most commonly used as a primary database, cache, message broker, and queue. Redis delivers sub-millisecond response times, enabling fast and powerful real-time applications in industries such as gaming, fintech, ad-tech, social media, healthcare, and IoT. Compared to other NoSQL databases, Redis has several unique characteristics that make it well-suited for certain applications. One of the main advantages of Redis is its in-memory storage, which allows it to provide fast access to data and high performance.

Pieter Noordhuis provided a great example using EventMachine and Redis to create a multi user high performance web chat. Redis is also often used as a cache, and has specific functionality to support this. We’ll see how to use some of these as we make our way through the course.

Benefits of Redis​

The retrieval is done without help from the database system in form of secondary indexes, aggregations or other common features of traditional RDBMS. Redis is very versatile when it comes to how we model data based on particular use cases. As mentioned earlier, it allows us to map keys to strings and other available supported data types. The other supported data types/models include lists, sets, hashes, sorted sets, streams, and so on. Redis offers purpose-built in-memory data structures and operators to manage real-time geospatial data at scale and speed. Commands such as GEOADD, GEODIST, GEORADIUS, and GEORADIUSBYMEMBER to store, process, and analyze geospatial data in real-time make geospatial easy and fast with Redis.

what is Redis

This makes Redis well-suited for applications that require fast access to large amounts of data, such as real-time analytics, online gaming, and e-commerce. To support chat and messaging applications, Redis can be used to store and manage data related to conversations, users, and messages. For example, Redis can be used to store information about individual conversations, such as the participants and the latest messages. It can also be used to store information about individual users, such as their profile details and their list of contacts. Finally, Redis can be used to store the actual messages themselves, along with metadata such as the sender, recipient, and timestamp.


Here is the link for the documentation on the commands used for operating on strings. We have previously seen an example of how to use the string data type. Redis is an open source project supported by a vibrant community, including AWS. There’s no vendor or technology lock in as Redis is open standards based, supports open data formats, and features a rich set of clients. Fast, open source in-memory data store for use as a database, cache, message broker, and queue. IBM Cloud® Databases for Redis is a fully managed solution for implementing Redis’s powerful in-memory caching capabilities in your modern application stack.

When an application relies on external data sources, the latency and throughput of those sources can create a performance bottleneck. One way to improve performance is to store and manipulate data in memory, physically closer to the application. Sharded Pub/Sub helps to scale the usage of Pub/Sub in cluster mode. It restricts the propagation of messages to be within the shard of a cluster. Hence, the amount of data passing through the cluster bus is limited in comparison to global Pub/Sub where each message propagates to each node in the cluster.

Cloud alternative with Redis Labs

In-memory databases are commonly used in applications that require fast access to large amounts of data, such as real-time analytics, online gaming, e-commerce, and social media. They are also used in applications that require high performance and scalability, as in-memory databases can handle high volumes of data and transactions without sacrificing performance. Redis is an open-source, in-memory data store most often used as a distributed cache. It offers a variety of efficient data structures designed to allow lightning-fast access to your data. Unlike Redis, however, Memcached is only capable of storing data in plain string keys. Redis, on the other hand, supports multiple storage formats for data and can automatically write data to disk in two different ways .

what is Redis

It’s fast, scalable, and supports advanced features like Pub/Sub and Lua scripting. However, it does have some drawbacks such as the need for additional memory and the lack of ACID compliance or support for joins. Take all this into consideration before using Redis in your project. Redis is often used for caching web pages, reducing load on servers and improving page loading times.

Caching Assessment

To put it simply, it is a database that keeps the whole dataset in RAM. Each time you query a database or update data in a database, you only access the main memory. It is the right time to pause a bit with this tutorial and start the fifteen minutes introduction to Redis data types in order to learn a few Redis commands.

what is Redis

Redisson, in particular, stands out for its rich offering of Java objects and collections. Keeps the dataset in memory for fast access, but can also persist all writes to permanent storage to survive reboots and system failures. Redis can handle millions of read/write operations per second at sub-millisecond latencies, and it runs on AWS, GCP, Azure, and other cloud platforms. Overall, Lua scripting is a powerful and flexible tool that can be used within Redis to write and execute complex operations on data stored in the database.

Claims processing​

This includes user profile information, OAuth tokens, credentials, session state, and more. In Redis, a key-value pair is a data structure that consists of a unique key, which is used to identify the data, and a value, which is the data itself. Key-value pairs are the most basic data structure in Redis, and they are used to store and manage data in the database. Overall, Redis persistence is a valuable feature that allows data to be saved to disk and restored in the event of a crash or shutdown, ensuring data durability and availability.

what is Redis

Because MemoryDB uses a durable transactional log that stores data across multiple Availability Zones , you can use it as your primary database. MemoryDB is purpose-built to enable developers to use the Redis API without worrying about managing a separate cache, database, or the underlying infrastructure. Redis Stack Server lets you build what is Redis applications with searchable JSON and time series data models, and extended probabilistic data structures. The open source, in-memory data store used by millions of developers as a database, cache, streaming engine, and message broker. Salvatore Sanfilippo, the original developer of Redis The name Redis means Remote Dictionary Server.

Storing a Hash in Redis

Supports rich data types − Redis natively supports most of the datatypes that developers already know such as list, set, sorted set, and hashes. This makes it easy to solve a variety of problems as we know which problem can be handled better by which data type. Implementing a message or job queue, where a master posts jobs and workers take jobs from the queue to process them, Redis stores random data that has to be accessed quickly by numerous servers. Because Redis supports a wide range of data types and even value structures, there are numerous use cases. Redis is built to handle real-time AI and machine learning workloads because of its scalability and high write throughput at low latency. Redis is often used as a primary database, enabling deep learning models directly where the data lives.

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