What are the uses of redis
Introduction to Redis
Redis is a high-performance key-value database.
Redis has the following three features with other key-value caching products:
- Redis supports data persistence, and can save data in memory to the disk, and can be used again when restarting Load for use.
- Redis not only supports simple key-value type data, but also provides storage of data structures such as list, set, zset, and hash.
- Redis supports data backup, that is, data backup in master-slave mode.
What are the uses of redis?
Five uses
1. Full page caching
Full page cache. If you're using server-side rendered content, you don't need to re-render each page for each individual request. Using a cache like Redis, you can cache frequently requested content, thereby greatly reducing latency for the most requested pages, and most frameworks have hooks for Redis caching pages.
// 设置全页面缓存1分钟 SET key "<html>...</html>" EX 60 // 获取全页面 GET key
2. Sequential arrangement
Because Redis’s Set data structure in memory can be incremented and decremented very quickly and efficiently, the performance is much higher than that of SQL queries. Compare this combined with Redis' sorted sets meaning you can grab the highest rated item in a list in milliseconds, and it's very easy to implement.
// 向排序集合中添加值 ZADD sortedSet 1 "one" // 从排序集合中获取所有值 ZRANGE sortedSet 0 -1 // 从排序集合中获取所有值与权重 ZRANGE sortedSet 0 -1 WITHSCORES
3. Session Storage
The most common use of Redis I have seen is session storage. Unlike other session stores such as Memcache, Redis can persist data so that if the cache is stopped, on restart, all data is still there. Even if it's not a strictly ongoing task, this feature can still save your users a lot of trouble. No one likes to see their conversations randomly deleted for no reason.
// 设置一分钟过期的session
SET randomHash "{userId}" EX 60
// 获取用户ID
GET randomHash4. Queuing
One of the less common, but very useful things you can do with Redis is queuing. Whether it's an email queue or data used by other applications, you can create an efficient queue in Redis. Any developer who is familiar with the stack and can push and pop projects can use this feature easily and naturally.
// 添加消息 HSET messages <id> <message> ZADD due <due_timestamp> <id> // 接收消息 ZRANGEBYSCORE due -inf <current_timestamp> LIMIT 0 1 HGET messages <message_id> // 删除消息 ZREM due <message_id> HDEL messages <message_id>
5.pub/sub
The ultimate real world use of Redis is the pub/sub that I will present in this article. This is one of the most powerful features built into Redis; the possibilities are endless. You can create a real-time chat system, trigger notifications for friend requests on social networks, and more. This feature is one of the most underrated features provided by Redis, but is extremely powerful and simple to use.
// 向通道中推送消息 PUBLISH channel message // 从通道中获取消息 SUBSCRIBE channel
Conclusion
I hope you enjoyed these real-world uses of Redis. While this article only scratches the surface of what Redis can do for you, I hope you'll gain some inspiration for how to get the most out of Redis.
The above is the detailed content of What are the uses of redis. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1378
52
How to build the redis cluster mode
Apr 10, 2025 pm 10:15 PM
Redis cluster mode deploys Redis instances to multiple servers through sharding, improving scalability and availability. The construction steps are as follows: Create odd Redis instances with different ports; Create 3 sentinel instances, monitor Redis instances and failover; configure sentinel configuration files, add monitoring Redis instance information and failover settings; configure Redis instance configuration files, enable cluster mode and specify the cluster information file path; create nodes.conf file, containing information of each Redis instance; start the cluster, execute the create command to create a cluster and specify the number of replicas; log in to the cluster to execute the CLUSTER INFO command to verify the cluster status; make
How to use the redis command
Apr 10, 2025 pm 08:45 PM
Using the Redis directive requires the following steps: Open the Redis client. Enter the command (verb key value). Provides the required parameters (varies from instruction to instruction). Press Enter to execute the command. Redis returns a response indicating the result of the operation (usually OK or -ERR).
How to read the source code of redis
Apr 10, 2025 pm 08:27 PM
The best way to understand Redis source code is to go step by step: get familiar with the basics of Redis. Select a specific module or function as the starting point. Start with the entry point of the module or function and view the code line by line. View the code through the function call chain. Be familiar with the underlying data structures used by Redis. Identify the algorithm used by Redis.
How to clear redis data
Apr 10, 2025 pm 10:06 PM
How to clear Redis data: Use the FLUSHALL command to clear all key values. Use the FLUSHDB command to clear the key value of the currently selected database. Use SELECT to switch databases, and then use FLUSHDB to clear multiple databases. Use the DEL command to delete a specific key. Use the redis-cli tool to clear the data.
How to use single threaded redis
Apr 10, 2025 pm 07:12 PM
Redis uses a single threaded architecture to provide high performance, simplicity, and consistency. It utilizes I/O multiplexing, event loops, non-blocking I/O, and shared memory to improve concurrency, but with limitations of concurrency limitations, single point of failure, and unsuitable for write-intensive workloads.
How to view all keys in redis
Apr 10, 2025 pm 07:15 PM
To view all keys in Redis, there are three ways: use the KEYS command to return all keys that match the specified pattern; use the SCAN command to iterate over the keys and return a set of keys; use the INFO command to get the total number of keys.
How to read redis queue
Apr 10, 2025 pm 10:12 PM
To read a queue from Redis, you need to get the queue name, read the elements using the LPOP command, and process the empty queue. The specific steps are as follows: Get the queue name: name it with the prefix of "queue:" such as "queue:my-queue". Use the LPOP command: Eject the element from the head of the queue and return its value, such as LPOP queue:my-queue. Processing empty queues: If the queue is empty, LPOP returns nil, and you can check whether the queue exists before reading the element.
How to start the server with redis
Apr 10, 2025 pm 08:12 PM
The steps to start a Redis server include: Install Redis according to the operating system. Start the Redis service via redis-server (Linux/macOS) or redis-server.exe (Windows). Use the redis-cli ping (Linux/macOS) or redis-cli.exe ping (Windows) command to check the service status. Use a Redis client, such as redis-cli, Python, or Node.js, to access the server.
