Gain insights into Redis's capabilities as a database, cache, and message broker. Delve into commands, transactions, and clustering. Explore flexibility, security, and data structure support with Redis.

Redis.tar.gz

Redis is an open-source, in-memory data structure store used as a database, cache, and message broker. Unlike Memcached, it supports multiple data types, giving a lot of flexibility to the user. Redis is easy to configure and provides clustering support to store data in multiple servers.

In this course, you will learn about the various commands that you can use to store different types of data structures in Redis. Some of those commands include utility, insertion, and modification commands.

You will also become familiar with different aspects of Redis, such as transactions, security, partitioning, and clustering. In all, this is your go-to guide to Redis.

Complete Guide to Redis

# `KEYS` command
If we need to find out what keys are stored in the Redis, we can use the `keys` command, as shown below. This command will return all the keys saved in the database. The syntax of this command is:
> keys *

![](/api/collection/6650775272947712/6601946975698944/page/6141570303655936/image/5350248013627392)

# `INCR` command
We can use this command if we need to increment the value of a given key by 1. In the example below, we are increasing the stock price of oracle by 1.
The syntax of this command is:
> INCR *key*


![](/api/collection/6650775272947712/6601946975698944/page/6141570303655936/image/6667308324880384)

# `INCRBY` command
We can use this command if we need to increment the value for a given key by a particular number. In the example below, we are increasing the stock price of **Oracle** by 5. The syntax of this command is:
> INCRBY *key count*


![](/api/collection/6650775272947712/6601946975698944/page/6141570303655936/image/4825054568251392)

> If the value is not an integer, then either the **ERR value is not an integer or out of range** error is thrown. If we try to increment a key that does not exist, then a new key with value 1, is created. Similarly, if we try to decrement a key that does not exist then a new key, with value -1, is created.

# `INCRBYFLOAT` command
This command is used if we need to increment the value of a key by a floating point number. In the example below, we are incrementing the stock price of **Oracle** by 3.5
The syntax of this command is:
> INCRBYFLOAT *key floatValue*

![](/api/collection/6650775272947712/6601946975698944/page/6141570303655936/image/6520764376285184)

Please try these commands in the terminal below:



* `SET Apple 300`
* `GET Apple`
* `INCR Apple`
* `INCRBY Apple 5`
* `INCRBYFLOAT Apple 3.4`
* `keys *`


Let’s look at some utility commands related to storing Strings in Redis.

Let's Begin

Redis Commands

Redis Advanced Concepts

Redis Cluster

Appendix

Storing Strings in Redis: Utility Commands

`KEYS` command

`INCR` command

Storing Strings in Redis: Utility Commands

KEYS command

INCR command

`KEYS` command

`INCR` command