I had used Redis in the past for my personal portfolio which is encapsulated by the ORM layer provided by Ruby on Rails, therefore I decided to spend a bit of time to learn on the CLI command. For me personally, Redis is just like MongoDB as there is a key value store pair, but the advantage of using Redis over MongoDB is the Read and Write performance.

Video on learning Redis

Traversy Media provided a really great video tutorial on how to get started with Redis! This is just my notes on learning Redis.

Installation

Redis support cross-platform, check https://redis.io/download for more details.

For mac user, simply just run brew install redis. For linux user, apt-get install redis. For windows, you need to download the .msi file on the official github repo.

Start redis server

Start the server with just the command redis-server

Start CLI

To start the CLI, simply just run redis-cli, where in this Command Line Interface (CLI), the command (the key value being set are case-sensitive) are not case sensitive as shown in the image below.

Useful command

• clear
• flushall - clear the database

Redis Setting up data and getting data.

In redis, to set data, we use SET <variable_name> <value>, and you can get the data with GET <variable_name> simple as that.

Set data to be expired

One cool feature of Redis database is that it can set a data to be expired in a certain amount of time.

Set a key to be expire

Initialize a key to expire in some time

TTL is a command to check how long the time left for the value to expire.

PERSIST

By using PERSIST command, you can make a value that is set to be expired to be persist data.

MSET

Set multiple key-value pairs

APPEND

Append operation will append the new value after the old value.

RENAME

change name of a key

RENAME test test1

---

LIST

Push from the LHS

Push from the RHS

POP

POP operation can be chosen from LHS or RHS with LPOP or RPOP, where it will remove the leftmost or the rightmost value in the list.

e.g.

> LPOP people
lai
> RPOP people
test

EXISTS

exist command works in both string and list.

> SET a 1
> LPUSH b 2
> EXISTS a
> EXISTS b

Conclusion

This is enough for me to work on Redis server already, the command seems to be much more simpler and cleaner than MongoDB.