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Technical Articles

Database

Redis

How to implement Redis Zset operation in php

Zset operation //Add one or more member elements and their score values ??to the ordered set. If a member is already a member of the ordered set, update the member's score and re-insert the member element to ensure that the member is in the correct position. Fractional values ??can be integer values ??or double-precision floating point numbers. $ret=$redis->zAdd('scores',98,'English',90,'physics');//Return the members in the specified range in the ordered set. Members are sorted in ascending order by score, and those with the same score are sorted in dictionary order.

May 30, 2023 pm 01:28 PM

php redis zset

What is the method for redis to implement session sharing?

Introduction Many projects in big factories are deployed on multiple servers. These servers exist in various regions. When we access the service, although the same service is executed, it may be run by different servers; when I was studying the project, I encountered In such a login scenario, assuming there are the following three servers (as shown in the figure), the session is used to store the user's login information. This information can be used to determine whether the user is logged in: Assuming that this login is performed through server 01, then this login The session information is stored in memory 01; but when I visit again, server 02 performs the operation, but the login session information is in memory 01, and server 02 cannot obtain it, so it will judge that I am not logged in and return an error.

May 30, 2023 pm 01:28 PM

redis session

Springboot cache redis integration method

By default, ConcurrentMapCache of ConcurrentMapCacheManager is used as the cache component. When using ConcurrentMap, the data is saved in ConcurrentMap. In fact, during the development process, we often use some caching middleware. For example, we often use redis, memcache, including the ehcache we use, etc. We all use some caching middleware. When we explained the principle before, we also discovered that springboot supports many cache configurations: as shown in the figure below: the default starting configuration is: SimpleCache

May 30, 2023 pm 01:22 PM

redis springboot

Example analysis of redis deployment and commands used for various data types

Compile and install redis and start deployment [root@mcw01~]$lsanaconda-ks.cfgmongodb-linux-x86_64-3.2.8.tgz[root@mcw01~]$wgethttp://download.redis.io/releases/redis-4.0. 10.tar.gz--2022-03-0518:27:02--http://download.redis.io/releases/redis-4.0.10.tar.gzResolvingdownload.redis.io(dow

May 30, 2023 pm 01:09 PM

redis

Why does Redis choose single thread?

1. Redis version iteration: Redis2.6, supports Lua scripts; Redis3.0, supports clusters; Redis4.0, hybrid persistence, multi-threaded asynchronous deletion; Redis5.0, core code reconstruction; Redis6.0, multi-threaded IO; Redis7.0, Function, Multi-part-AOF; 2. Why did Redis always use single thread before Redis4.0? 1. Redis adopts a single-threaded model to facilitate development and maintenance; 2. The single-threaded model can also handle multiple client requests concurrently through IO multiplexing and non-blocking IO; 3. For Redis, the main performance bottleneck is memory and Network, not CPU; 3. Redis6

May 30, 2023 pm 01:01 PM

redis

How to build a Redis cluster based on Docker

Environment: Docker+(Redis:5.0.5*3)1. Pull the image dockerpullredis:5.0.52. Create a Redis container. Create three redis containers: redis-node1: 6379redis-node2: 6380redis-node3: 6381dockercreate--nameredis-node1 -v/data/redis-data/node1:/data-p6379:6379redis:5.0.5--cluster-enabledyes--cluster-config-filenodes

May 30, 2023 pm 12:46 PM

redis docker

How to integrate SpringBoot and Redis

Integration of SpringBoot and non-relational database Redis (1) Add the SpringDataRedis dependency starter and introduce this dependency to create a project. The following dependencies will appear in the project pom.xml file: (2) Write the entity class Person: packagecom.hardy.springbootdataredis.domain ;importorg.springframework.data.annotation.Id;importorg.springframework.data.redis.core.RedisHash;importorg.s

May 30, 2023 pm 12:03 PM

redis springboot

How to deploy redis database in CentOS

Redis has created a new data storage idea. Using Redis, we don't have to focus on how to put the elephant into the refrigerator when facing a database with monotonous functions. Instead, we can use Redis's flexible and changeable data. Structure and data manipulation, building different refrigerators for different elephants. The specific steps to deploy redis on CentOS are to unzip, enter the redis directory make&&makeinstall, compile and install, check the running status, modify the configuration file /etc/redis/6379.conf, set the password, and then modify the redis.properties mentioned earlier. Use the following command to view the data indicating that redis has started. It worked

May 30, 2023 am 11:55 AM

redis centos

What are the common ways to use Redis?

1. Common usage methods Several common usage methods of Redis include: 1. Redis single copy; 2. Redis multiple copies (master-slave); 3. Redis Sentinel (sentinel); 4. Redis Cluster; 5. Redis self-research. 2. Advantages and disadvantages of various usage methods 1. Redis single copy Redis single copy adopts a single Redis node deployment architecture. There is no backup node to synchronize data in real time, and does not provide data persistence and backup strategies. It is suitable for applications with low data reliability requirements. Pure caching business scenario. Advantages: simple architecture and easy deployment; high cost performance: no backup node is required when using cache (single instance availability can be guaranteed with supervisor or crontab

May 30, 2023 am 11:53 AM

redis

What is the method for implementing delay queue in Redis?

1. Introduction 1.1. What is a delay queue? The biggest difference between a delay queue and an ordinary queue is reflected in its delay attribute. The elements of an ordinary queue are first in, first out, and are processed in the order they are added to the queue, while the delay queue The elements in will be assigned a delay time when they are enqueued, indicating that they hope to be processed after the specified time has passed. In a sense, the structure of the delay queue is not like a queue, but more like an ordered heap structure with time as the weight. 1.2. Application Scenarios In some business scenarios, we often encounter functions that need to be executed after a period of time or at a certain time point. For example, the following scenarios: Create a new order, and if payment is not made within the specified time, the takeout needs to be automatically canceled or the taxi will arrive at the estimated time.

May 30, 2023 am 11:29 AM

redis

How to configure the master-slave mode of Redis cluster

1. Why is a cluster needed? In our actual development, it is not possible to use only one Redis in engineering projects for the following reasons: (1) Structurally, a single Redis server will have a single point of failure, and one server needs to handle all requests. load and pressure; (2) In terms of capacity, the memory capacity of a single Redis server is limited. Even if the memory capacity of a Redis server is 256G, all the memory cannot be used as Redis storage memory. Generally speaking, the maximum usage of a single Redis server is Memory should not exceed 20G. (3) The reading and writing performance of a single Redis server is limited, and the reading and writing capabilities can be improved by using a cluster. 2. Introduction to master-slave mode Currently, Redis has three cluster modes:

May 30, 2023 am 10:47 AM

redis

How to solve the problem that php5.6 cannot extend redis.so

First, let's understand what Redis is. Redis is a high-performance key-value storage database that can be used to store, read, and operate various types of data, such as strings, hash tables, lists, sets, and ordered sets, etc. It mainly uses memory as the storage medium, making Redis very fast and efficient. PHP interacts with Redis by extending redis.so or phpredis extension. These extensions provide various API functions so that developers can easily access Redis in PHP code. However, in some versions of PHP, especially php5.6, there are some problems that cause these extensions to not work properly. If you are using php5.6 version and

May 30, 2023 am 10:21 AM

php redis

What are the basic knowledge points of Redis?

1. What is Redis? Let’s first take a look at the introduction given by the Redis official website: Redisisan opensource (BSDlicensed), in-memorydatastructurestore, usedasadatabase, cacheandmessagebroker. It supports datastructures such as strings, hashes, lists, sets, sortedsetswithrangequeries, bitmaps, hyperloglogs, geospatialindexeswit

May 30, 2023 am 09:38 AM

redis

centos7 yum installation redis and what are the common commands

What is redis? Redis is a memory-based data structure storage, durable log-type, Key-Value database. When a site using a relational database reaches a certain amount of concurrency, there will often be a bottleneck in disk IO. At this time, working with redis has certain advantages because it has the following characteristics: running based on memory, high concurrency reading and writing; support Distributed, theoretically infinitely expandable; rich data types; persistent, can be written to disk regularly; application scenarios cache "hot" data (high-frequency reading, low-frequency writing) counters, current limiter message queue system (publish and subscribe, Ranking list) Distributed lock, shared session, queue data type: The data types provided by Redis are mainly divided into 5 types.

May 30, 2023 am 09:36 AM

redis centos yum