What is Redis and What Does It Do?

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Trevor Sullivan covers the Redis cache service: what it is, what it does, and how it helps. It's an open source tool that runs as a service in the background that allows you to store data in memory for high-performance data retrieval and storage. That's the technical explanation, but watch on to hear about how useful it is for all manner of use cases.

Imagine you have a web application that's running inside a Docker container or directly on a server. If that web application needs to retrieve some data from a database like MySQL, PostgreSQL or MS SQL, that query could take anywhere between 15 and 60 seconds.

If you have a user waiting up to a minute for the performance of that report data or whatever data the user is trying to receive, you're going to have an unhappy user. A redis cache speeds all that up.

It's possible to store data inside of a Redis cache instance and make the retrieval of that data occur directly from memory (RAM) from a server that's running the Redis service — rather than making the application go all the way back to the database. Instead, the web server can check with Redis if it has the data it wants.

Redis isn't particularly valuable when it's standing in-between one web server and a database. But, what if you're running a large scale fleet of hundreds of webservers? One Redis cache can pool the requests and answers for all those webservers so that they don't have to individually go all the way to the database each time.

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My man looks like he's putting tutorials straight from Antarctica

pinxtr

Awesome explanation Trevor. Breaking down problems into dummy understanding is an art.

riskitall

I thought u were Jack Dorsey at firsts lol

ekanastone

Awesome elaboration. He hit the nail straight to the point

courageahorttor

I started a LinkedIn course on Redis, just to see what is it about. After 20 minutes I started to search on YouTube for a summary of Redis and get the meaning of it in short time. This explanation is short, understandable, just great. Thanks!

lajos

This is a really good video. I’m a network engineer playing with docker and I’ve seen this a few times. Always wondered what it is.

PowerUsr

FINALLY! a clear explanation as to what it actually does. thank you for this.

StrikerEureka

Thanks for starting from User experience, so we can understand the use-case clearly.

didorins

Thank you so much. Heard Vercel recently implemented a Key-Value system, and it’s a Redis-like data system. This video gave me a good overview of Redis.

Paul_Aderoju

real quick and awesomely covered in less time.

Shubham__Saroj

Couldn't have put it better, great work!

RedisUniversity

awesome explanation and greatly clear english speaking. I can fully listen to you without looking at the sub. Well done!

baolam

That's a nice explanation Trevor, i like the way you explained bit by bit to understanding level

davidmunyiri

Very good in explaining Redis serving as a cache system; would be nice to expand to all important features of Redis ...

MrPx

Simple and precise, it made me recall how my fried explained me about Redis and Guava caching but unfortunately i dont recall the difference btw them.

mohammadzulqarnain