As a high-performance in-memory database, Redis is widely used in current mainstream distributed architecture systems. To improve system fault tolerance, using multiple instances of Redis is also inevitable, but the complexity is much higher than that of a single instance. This article mainly introduces the four deployment modes of Redis and their advantages and disadvantages.StandaloneStandalone mode is to install a Redis, start it, and business connects to it and that's all. The specific installation and startup steps are not repeated here. Standalone mode is also used in many scenarios, suc...

Redis is a high-performance, in-memory key-value database. According to official test reports, it can support around 100,000 QPS (queries per second) on a single machine. However, Redis uses a single-threaded architecture in its design.Why does Redis still have such high performance with a single-threaded design? Wouldn't it be better to use multiple threads for concurrent request processing?In this article, let's explore why Redis has a single-threaded architecture and still maintains its speed. The focus is on the following four aspects:Data storage in memoryEfficient data structuresSingle-t...

Redis is frequently used as a caching layer for web applications to improve its performance. In PHP 5.x, if one wants to use Redis, the redis extension needs to be installed and enabled first.This post will show how to install and enable redis extension on Windows with PHP 5.X. Basically there are two dlls to be downloaded: php_redis.dll and php_igbinary.dll.Below are detailed stepsGo to http://windows.php.net/downloads/pecl/releases/redis/2.2.7/ and find the respective php_redis zip matching your environment.Go to windows.php.net - /downloads/pecl/releases/igbinary/2.0.1/ and f...

Nowadays, Redis has become one of the most popular cache solution in the Internet industry. Although relational database systems (SQL) bring many awesome properties such as ACID, the performance of the database would degrade under high load in order to maintain these properties.In order to fix this problem, many companies & websites have decided to add a cache layer between the application layer (i.e., the backend code which handles the business logic) and the storage layer (i.e., the SQL database). This cache layer is usually implemented using an in-memory cache. This is because, as state...

In this post, I will discuss a few common partition techniques in distributed cache. Especially, I will elaborate on my understanding on the use of Redis Cluster.Please understand that at the time of writing, the latest version of Redis is 4.0.10. Many articles on the same topic have a different idea from this post. This is mainly because, those articles are probably outdated. In particular, they may refer to the Redis Cluster implementation in Redis 3. Redis Cluster has been improved a lot since Redis 4.Common Partition TechniquesHere, we refer to horizontal partitioning, which...