How To Configure Redis Cache in WordPress

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The advantage of using Redis Cache in your WordPress Core configuration is that it speeds up the delivery of content to the client. When you have a lot of traffic, WordPress performs a lot of MySQL query lookups, which makes it quite slow. Hence, you must know how to configure Redis Cache in WordPress to increase your website’s performance.

In this instance, Redis cache plays a critical role and can help you achieve your goal. Redis will be a memory-based key-value pair database, meaning that it will store all key-value data in memory. As a result, it’s a quick caching option for server-side applications like WordPress.

What is Redis Cache?

This open-source in-memory data store is used by millions of developers as a database, cache, streaming engine, and message broker.

Redis is commonly used as a cache to hold frequently visited data in memory, enabling apps to respond to customers rapidly. Redis allows you to determine how long you want to keep data and which data to evict first, allowing you to create a multitude of complex caching patterns.

Intelligent caching has a tremendous effect on user experiences, efficiency, bounce rates, and consumer spending for a variety of reasons.

What are different Redis Data Types?

Strings:

The most basic type of Redis value is a string. Because Redis Strings are binary safe, they can carry any type of data, including JPEG images and serialized Ruby objects.

A String value can be up to 512 Megabytes long.

Lists:

Redis Lists are just strings ordered by insertion order. New entries can be added to a Redis List by shoving them to the list’s head (on the left) or tail (on the right) (on the right).

Sets:

Redis Sets are a set of Strings that aren’t in any particular sequence.

Redis Sets provide the benefit of preventing duplicate members. The set will have one duplicate of the same element if it is added several times.

Hashes:

Redis Hashes are appropriate for expressing objects because they are transformations among string fields and string values.

Hashes are commonly used to represent things, but they can also be used for a variety of other reasons due to their ability to hold a vast number of items.

Sorted sets:

Similar to Redis Sets, Redis Sorted Sets are non-repeating collections of Strings. The difference is that each component of a Sorted Set has a score that is used to sort the Sorted Set from lowest to highest score. Despite the fact that each member is unique, scores may be repeated.

Sorted Sets make it simple to add, remove, or update parts. You can easily generate ranges by score or rank since components are stored in order and are not reordered (position).

What is Redis Used for In WordPress?

Redis is a database caching service at its heart. Data from databases may take a long time to arrive. A database can easily have taken 300 milliseconds to react in a favorable circumstance. That doesn’t account for the time it takes for a remote system to make the call, travel to a web application, has that web service process the data, and then react with database information. Redis, on the other hand, can provide data in as low as 20 milliseconds.

Although the gap between 20 and 300 milliseconds may not appear to be a significant amount of time, it is merely a best-case situation. Large online apps can take seconds to reply with information during peak traffic times. That isn’t a pleasant user experience. Similarly, such traffic can put an unnecessary strain on a database.

Instead of directly querying a database, a web application might first check a Redis cache instance to determine if the information it requires is accessible there. This can substantially reduce the time it takes for a web application to reply to a client or the stress on a database.

Databases are frequently not housed on the very same system as the web application. This means that accessing a database places extra strain on a network. Using a Redis cache instance can also reduce network activity.

Redis is used to accelerate applications by caching data in a dynamic storage mechanism (System Memory) which is much faster than standard storage systems (hard drives).

Redis Advantages

There are a lot of advantages to using Redis in your application. I’ve listed them below.

  1. Redis supports key-value pairs up to 512 MB in size.
    Redis supports hash values of objects up to 512 MB in size, which means that a single entry can hold up to 1GB of data.

2.     Redis features its own hashing algorithm, known as Redis Hashing.

Redis stores data as string fields and string values in the form of a key and a map.

3.     Redis offers data replication.

Replication is the process of setting up master-slave cache nodes. The slave nodes always listen to the master node, which means that when the master node is updated, slaves will automatically be updated, as well. Redis can also update slaves asynchronously.

  1. The Redis cache can survive failures and maintain service continuity.
    Because Redis could be used to set up effective replication, the cache service will be available at all times, even if any of the slave nodes are unavailable. The nodes, on the other hand, are robust and will survive the failure and continue to provide service.
  2. All of the top programming languages have Redis clients.
      Client APIs for Redis has been written in a variety of languages, including C, Ruby, Java, JavaScript, and Python.
  3. A pub/sub messaging system is available in Redis.
    Using the Redis pub/sub system and any language of your choice, you may create a high-performance messaging application.
  4. Redis makes it simple to store large volumes of data in its cache.
     
    Occasionally, millions of chunks of information must be loaded into the cache in a short amount of time. This is simple to accomplish with Redis’ mass insertion capability.
  5. Redis is a database that can be installed on Raspberry Pi and ARM devices.
    Redis requires less RAM and can be loaded on a Raspberry Pi to allow IoT-based applications.
  6. The Redis protocol makes it easy to create a client.
    RESP is used by a Redis client to communicate with its server (Redis Serialization Protocol). This protocol is user-friendly and easy to install.
  7. Transactions are supported by Redis.
    Redis enables transactions, which implies that instead of running commands one at a time, they can be run in a queue. Typically, commands issued after MULTI are added to a queue, and when EXEC is delivered, all of the commands in the queue are performed at the same time.

How to Configure Redis Cache in WordPress?

·   Enter WordPress dashboard

Redis Cache In WordPress

·   Click Plugins -> Add New from the left-hand side menu

Configure Redis in WordPress

·   Search for “Redis”

·   Install and activate

How To Configure Redis In WordPress

·   Click on Settings -> Redis from the left-hand side menu

Redis In WordPress

·   In the Overview tab, click on “Enable Object Cache”

Enable Object Cache In Redis WordPress

Conclusion

You will be able to speed up your site significantly if you run a large website, such as woo-commerce. Furthermore, database-intensive processes will be cached to enhance the site’s performance.

The cache is being utilized even when many people are placing orders. Your backend will be faster and use fewer resources.

Objects and database queries are the only things that Redis caches. In addition, you can use plugins like WP Cloudflare and Cache Enabler to cache your pages, even more, to make your website faster.

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