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

We know that the data in Redis is stored as key-value pairs. The value can also be a field-value pair. This is called the **Hash** data structure. Suppose we need to store the employee ID and name of all the employees within a department. In this case, we can use Hashes in Redis. The key will be the department name, and the value will be the empId-empName pair.



Let's look at some of the commands used to insert and retrieve data from hashes in Redis.

# `HMSET` command
The `HMSET` command is used to store a hash in Redis. The syntax of this command is:
> HMSET *key field value*

In the example below, we are storing employee data in the finance department.

![](/api/collection/6650775272947712/6601946975698944/page/4871221842804736/image/5199922212110336)

We can also store multiple field-value pairs in a single command, as shown below.

![](/api/collection/6650775272947712/6601946975698944/page/4871221842804736/image/5818449042341888)

# `HGETALL` command
This command is used to get all the field value pairs for a given key. The syntax of this command is:
> hgetall *key*

In the example below, we are finding all the employees in the finance department.

![](/api/collection/6650775272947712/6601946975698944/page/4871221842804736/image/6220952808456192)

# `HGET` command
We can use this command if we need to find the value of a particular field within a key. This is useful if the hash contains a lot of field-value pairs, and we don't need them all. The syntax of this command is:

> HGET *key field* 

In the example below, we are finding the employee name for id 124.

![](/api/collection/6650775272947712/6601946975698944/page/4871221842804736/image/5517265366679552)

Please try these commands in the terminal below:


* `hmset finance 123 Alex 124 Carl`
* `hgetall finance`
* `hget finance 123`






Let’s look at the commands used to store hashes in Redis.

Let's Begin

Redis Commands

Redis Advanced Concepts

Redis Cluster

Appendix

Storing Hashes in Redis

`HMSET` command

Storing Hashes in Redis

HMSET command

`HMSET` command