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What is a Key-Value Database: Redis?

What is a Key-Value Database: Redis?

Are you looking for a simple yet trustworthy key-value database to store your data? If YES, this article is for you. Various popular and available databases in the market claim a lot more than they deserve. So, who to trust? Well, Redis is one of the most popular and trustworthy databases with built-in memory, its fast, cost-effective ability to geospatial data on a larger scale, real-time, and boosted speed. Redis offers a data structures server, used as a key-value database and effective in managing cache and working as a message broker. All kinds of data management are not a problem for Redis. Let's find out in-depth information on this key-value database Redis.

What is a key-value database?

A specific NoSQL database is called a key-value database, commonly referred to as a key-value store. A key-value database or key-value store uses a simple string or single key or a set of keys / delete keys / multiple keys to access associated values, unlike earlier relational NoSQL databases that kept data structures served in predefined tables and columns. They are collectively referred to as key-value pairs. These values can range from specific objects with several nested values to simple string data types like texts or integers. Every simple string key is a particular designation number coordinating with a deal or a location where data is maintained.


When to use a key-value database

Your application may be volatile if it must manage a large number of little continuous reads and writes. Access to key-value databases is quick and in-memory. Storing webpages with the URL as the key and the webpage as the value; storing fundamental data, like customer information; preserving the contents of shopping carts, product categories, and e-commerce product information. For programs that don't need frequent updates or support for sophisticated queries.

Use cases for key-value databases

Shopping cart

It serves as an e-commerce website or online key-value store that may acquire billions of orders in a split second, specifically when the vacation season is around the corner, which is excellent for shopping. Through distributed processing and storage, key-value databases can scale to support millions of concurrent users and extraordinarily high volumes of state changes. The redundancy already in key-value databases can handle the loss of storage nodes.

Session store

When a user logs in, a session is initiated by a session-oriented program, such as a web application, which lasts till the existing user logs out of the key-value store or key-value databases until login time is extended till the session expires. During this time, the program keeps all session-related information in a NoSQL database or the main memory. Some examples of session data types include user profile details, messaging, personalized data and themes, recommendations, targeted promotions, and discounts. There is a specific identifier for each user session. Quick key-value stores are a better fit for session data types because it is never queried by anything other than the primary key /delete keys / multiple keys or a simple string. In general, key-value databases may have lower per-page overhead than relational databases.

What is Redis?

Remote Dictionary Server, or Redis, is a fast, accessible, in-memory key-value database. Salvatore Sanfilippo, the creator of the Redis server, intended to increase the scalability of his Italian firm, which is how the project started. From there, he created a Redis instance, a NoSQL database, cache, message broker, delete keys, multiple keys, and queue that is now in use.

Redis instance has fewer than one-millisecond response rates, enabling millions of queries per second for real-time applications in sectors including gaming, ad tech, financial services, healthcare, and IoT. Redis key-value databases have been ranked as one of the most loved as per Stack Overflow for more than five years, making it one of the most well-liked open-source engines today. Redis server is an excellent option for caching, gaming, gathering analytics, session management, leaderboards, chatting/video calling, geospatial, ride-hailing, video streaming, and pub apps because of its immediate and prompt enactment.

For running the Redis instance, AWS provides two wholly managed services. Redis key-value databases or key-value stores are compatible, dependable, in-memory database services with lightning-fast performance is Amazon MemoryDB for Redis server. With microsecond latency, the fully managed caching service Amazon ElastiCache for Redis speeds up data access from primary databases and data stores. Additionally, ElastiCache supports Memcached, another well-liked open-source caching engine.

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Is Redis good as a database?

Redis key-value database or key-value store was initially designed as a cache database but has later transformed into the central database. Redis server is a common primary database used in modern applications. Most of the providers of Redis service support Redis instance as a data keeper and cache maintainer but not as the main database. In addition to using the Redis server, you also need a different database, such as DynamoDB. That increases complexity, reduces response time, and stops you from utilizing the Redis instance fully.

Redis server is a database for various data volumes, from megabytes - MB to terabytes - TB of data, that can be processed and stored. By combining Redis' capabilities as the main database and in-memory cache in one system with Redis Enterprise, you can do away with the complications and response time of running two distinct approaches. Additionally, Redis may be used as a primary database that supports several models, allowing you to construct contemporary apps and low-time interval microservice-based construction on the peak of it.

Use Redis Enterprise's native functionality (modules) to replace the need for different cache options and databases, such as:

  • Redis instance JSON, storing JSON documents and streams for gathering and spreading data
  • For additional indexes, use RediSearch
  • Relationship complexity with RedisGraph
  • RedisTimeSeries for monitoring applications
  • RedisBloom for leaderboards, gaming, and fraud detection
  • RedisAI for inferencing and immediate AI feature storing
  • Utilize corporate clustering, auto-scaling, and Geo-Distribution that is Active-Active to take advantage of those mentioned above

How fast is Redis?

Redis is quite a fast evaluation tool that would be great to have. To know how quickly the Redis instance moves. Second, Redis requires some platform experience data types that can be utilized to gauge the magnitude of Redis's performance. Redis, fortunately, offers such a tool and some experience information for widely used hardware systems.

Redis performance can be assessed using the Redis benchmark. The command line can determine how well specific Redis commands operate in pipeline mode, normal mode, and under various pressures.

Redis database

Redis performs exceptionally well. The maximum load level and set and get time consumption levels for a key-value database system are sub-milisecond usually. The effectiveness of Redis operations can be increased by using pipelines.

Check out the following factors that made Redis instance fast:


Redis is an in-memory NoSQL database. Hence there is a RAM restriction. Therefore, Redis employs a defined eviction policy to either cause out-of-memory or data eviction when memory storage data is exhausted.


Every action a client application sends to Redis occurs within a connection context. Whether it's due to your operating system, Redis' setup, or a service provider's plan, the maximum number of connections to the Redis server is always constrained. A new application client or executive session should always be able to connect if there are sufficient free resources available.


The program should access the contents saved for the cache to work at its best.


If your cache hit ratio falls below a certain threshold, it may indicate that the eviction has been triggered, removing data from Redis and leading to cache misses.

Expired objects

Maybe you are not expiring the cache objects since the eviction started when Redis' memory was low.

Is Redis better than MongoDB?

Let's try to respond to the Redis vs. MongoDB debate. No one solution applies to all situations. Thus, the choice must be made in light of the business needs, financial constraints, and other factors indicated below. The main criteria used in the Redis vs. MongoDB comparison are as follows:


  • Redis includes capabilities like durability, caching, and trouble-free crash fixes, while MongoDB has map-reduce and aggregation of data features.
  • Control over accounting using roles is available with MongoDB. However, it is not with Redis.
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  • In comparison to MongoDB, Redis instance is better at handling heavy workloads. Redis utilizes a simple string, single core, and is single-threaded.
  • Redis, therefore, outperforms MongoDB marginally in terms of performance. Once the CPU constrains it, MongoDB is likewise renowned for responding slowly.


  • In comparison to Redis, MongoDB offers superior support for the scalability factor. MongoDB optimizes RAM functionality on physical platforms, but Redis restricts RAM consumption.
  • Although Redis has many peripheral functions, scaling is easier with MongoDB.

Platform support

  • A server for in-memory data structures is Redis.; It works with message brokers and permits caching. With the aid of Java clients, it provides support for the spring cache.
  • Platform-independent NoSQL database MongoDB has BI connectors for analytics, spring data support, and an interactive Redis commands query interface using a command line.

Database architecture

  • Redis Server and Redis Client are both components of Redis' database architecture. Data is kept in memory by Redis Server.
  • A focused on documents NoSQL database is MongoDB. Tools for bringing in and bringing out binary data, approaching security and characteristic data, and the construction of distributed systems, GridFS, and MongoDB Compass are all portions of the NoSQL database construction.

Programming language support

  • C, C#, Objective-C, Crystal, Clojure, Fancy, Haxe, Java, JavaScript (Node.js), Python, Lisp, MatLab, Lua, Elixir, OCaml, Pure Data, Swift, Dart, Pascal, Rebol, Ruby, Scheme, Tcl, Visual Basic, and other programming languages are supported by Redis instance.
  • C, Clojure, Java, C++, Groovy, Scala, Dart, Erlang, Haskell, Perl, Lua, Rust, Powershell, Python, PHP, R, Haskell, Prolog, Swift, Smalltalk, etc., are just a few of the programming languages that MongoDB supports.

Replication Support

  • Redis support both Master-Master and Master-Slave replication.
  • MongoDB supports Master-Slave replication.


  • Before implementing Redis commands, adhere to solid authentication protocols. However, it only requires a straightforward password-based authentication to grant users access, which could compromise security.
  • Security is something that MongoDB takes seriously. It uses encrypted Redis data types and authentication procedures to verify the user. The ability to specify access and command in MongoDB enables users to allocate accounts based on role responsibilities, enhancing security.

Documentation support

  • You may get technical documents, instructions, and programming support for Redis key-value databases.
  • You may find technical documents and the expanded handbook for MongoDB.


  • The price of Redis' Enterprise Cloud changed depending on how much Redis data types needed to be stored. Its licensing is based on a subscription system-Redis' free Basic price option. Pricing for higher versions starts with a monthly fee of $7.
  • The Basic plan for MongoDB is similarly cost-free. The cost of adding another license for commercial would cost monthly $57.

In a nutshell

After discussing Redis - key-value databases, all the fundamental Redis data types operated in Redis key-value databases, and the standard Redis commands used for managing them. You must have relatively adequate knowledge of Redis key-value databases and can begin using Redis for personal and business use. In recap, Redis key-value databases contribute favorably to authentic and systematic optimizations with its essential features and general users for data structures, server storage, and cache purposes. You can follow the online documentation available on the Redis site that will outline more information about the platform.

Similarly, once starting its use, you can further explore it with additional advanced components like transactions, pipelines, etc., and much more. These advanced characteristics, however, are not usually used on the command line interface of Redis key-value database consumers but are more generally used in the different created applications with coding through various programming languages.

Not only for the apps that are made with coding but also beneficial for the apps that are developed using a no-code platform like AppMaster. AppMaster is a no-code app development platform allowing you to build your web and mobile applications with an easy drag-and-drop interface.

AppMaster has a Redis module. Developers can use a key-value connection to any Redis database for synchronization between microservices and in cases where websocket balancing is used.

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