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Technical Articles

Database

Redis

How Springboot integrates Redis to achieve overselling problem

Oversold Simple Code Write a simple and normal oversold logic code. Multiple users can operate the same piece of data at the same time to explore the problems that arise. Store a piece of data information in Redis, request the corresponding interface, and obtain product quantity information; if the product quantity information is greater than 0, deduct 1 and re-store it in Redis; run the code to test the problem. /***Redis database operation, oversold problem simulation*@author**/@RestControllerpublicclassRedisController{//Introducing String type redis operation template @AutowiredprivateStringRedisTemplatestringRe

May 26, 2023 pm 07:52 PM

redis SpringBoot

How to implement the internal implementation of ordered collections in Redis

There are two internal implementations of ordered sets: ziplist and skiplist. Next, we will learn more about each in detail. Use compressed list as internal implementation when the number of elements in the ordered set is less than zset-max-ziplist-entries (default is 128), and the length of each element member is less than zset-max-ziplist-value (default is 64 bytes) ), a compressed list is used as the internal implementation of the ordered set. Each set element consists of two compressed list nodes close together, where the first node stores the members of the element and the second node stores the branches of the element. Compressed column

May 26, 2023 pm 07:25 PM

redis

What are the common API operations of redis?

//Set key-value pair//setkeyvalue[EXseconds][PXmilliseconds][NX|XX]//Get value//getkey//Delete key//delkey//Clear database//flushdb//Get list value//lrangekeystartstop/ /map type//hgetkeyfield//hgetallkey//sortedset type packagehgs.redislearn;importjava.io.IOException;importjava.util.HashMap;importj

May 26, 2023 pm 07:07 PM

API redis

How to configure redis installation and master-slave replication in CentoS environment

Dependent environment centos6.5gcc-4.4.7: Compile redis original file tcl-8.5.7: Run compilation detection 1. Compile redis#cd/usr/local#tar-zxvfredis-4.0.1.tar.gz#mvredis-4.0. 1redis#cdredis#make runs compilation test maketest requires tcl-8.5 and above #yuminstall-ytcl#maketest2. Start redis#cdsrc#./redis-server3. Visit redis#cd./redis-cli. It is recommended to install the latest version on linux.

May 26, 2023 pm 07:07 PM

redis CentOS

How to implement Redis subscription and publishing using the sub-pub mechanism in python

Let’s first introduce the pub/sub function of redis: Pub/Sub function (meansPublish,Subscribe) is the publish and subscribe function. In event-based systems, Pub/Sub is currently a widely used communication model. It uses events as the basic communication mechanism to provide a loosely coupled interaction model required by large-scale systems: subscribers (such as clients) subscribe to events. The method expresses an event or a type of event that it is interested in receiving; the publisher (such as the server) can notify relevant subscribers at any time of events that the subscriber is interested in. In layman's terms, it means that my sub-side (subscriber) is always listening. Once the pub-side (publisher) publishes a message, then I will receive it. For example,

May 26, 2023 pm 06:55 PM

Python redis

How to install redis extension in liunx php

How to install the redis extension in liunxphp: 1. Check the redis version; 2. Download the installation package through the wget command and decompress the installation package through "tarzxf"; 3. Execute "cdredis-4.0.8/srcmake" to install redis. Installing redis on linux It is very simple to install redis on linux. It is introduced on the official website. Install redis: 1. Check the redis version first 2. Install redis#2.1 Download the installation package wgethttp://download.redis.io/releases/redis-4.0.8.tar.gz#2.2 Unzip tarzxfredis

May 26, 2023 pm 06:52 PM

PHP redis liunx

How to install Redis extension using YII2 framework

1. You need to download the windows version of the master branch of yii2-redis with composer 2. Unzip and copy it to vendor/yiisoft 3. Add 'yiisoft/yii2-redis'=>array('name'=>'yiisoft to extensions.php under yiisoft /yii2-redis','version'=>'2.0.

May 26, 2023 pm 06:41 PM

redis yii2

How to implement Redis cluster installation and configuration under Docker

1. All machines pull the image dockerpullredis 2. Master-slave cluster construction 2.1, redis.cong file 2.1.1, master node: bind0.0.0.0protected-modeno//redis configuration access password requirepass123456//master node password in sentinel mode The password masterauth1234562.1.2 is required to restore a node from downtime to a slave node. Slave node: bind0.0.0.0protected-modenorequirepass123456//master node access password masterauth123456//master node information sl

May 26, 2023 pm 06:36 PM

Docker redis

How to install redis in Linux centos7

1. Because redis is developed in C language and is based on C language, we have to first check whether we have installed the gcc environment. If it is not installed, install it online to see if gcc is installed. If gcc is installed, gcc-v will display the version. If it is not installed, install yum-yinstallgcc online. -c++2, decompress the redis compressed package and compile and decompress [root@localhostsoft]#tar-zxvfredis-3.0.0After decompression, you can see our redis folder and enter our redis directory to compile makecdredis-3.0.0make3 , create folder installation and create folder mkdir/usr/local/re

May 26, 2023 pm 06:28 PM

Linux redis CentOS

What are the features of Redis5.0

New Streamdatatype (Streamdatatype) New Redis module API: Timers, Cluster and Dictionary APIs (Timers, Cluster and Dictionary APIs) RDB can now store LFU and LRU information Cluster manager in redis-cli from Ruby (redis-trib.rb ) was ported to C language code. Execute `redis-cli–clusterhelp` command to learn more New sortedset command: ZPOPMIN/MAX and blocking variants (blockingvariants) Upgrading Activedefragment

May 26, 2023 pm 06:16 PM

redis

What are the situations of Redis blocking?

Command blocking uses inappropriate commands to cause client blocking: keys*: obtains all key operations; Hgetall: returns the sum of all fields in the hash table; smembers: returns all members in the set; the time complexity of these commands is O(n ), and sometimes a full table scan is performed. As n increases, the time consumption increases and the client is blocked. SAVE blocking Everyone knows that when Redis takes an RDB snapshot, it will call the system function fork() to create a sub-thread to complete the writing of temporary files, and the triggering condition is the save configuration in the configuration file. When our configuration is reached, the bgsave command will be triggered to create a snapshot. This method will not block the main thread and is executed manually.

May 26, 2023 pm 06:16 PM

redis

What is the command to shut down redis in Linux system?

How to shut down redis correctly in Linux system? If redis is forcibly closed or the shutdown method is improper, may it cause some unexpected things? servicenetworkrestar#Restart network ipaddr#Find ip[root@localhost~]#cd/usr/local/redis[root@localhostredis]#./bin/redis-server./redis.conf[root@localhostredis]#./bin/ redis-cli127.0.0.1:6379>exit[root@localhost

May 26, 2023 pm 05:58 PM

Linux redis

How to install redis and redis extension on Ubuntu

1. Download the latest source code package and copy the link address wgethttp://download.redis.io/releases/redis-x.x.x.tar.gz. Warm reminder: the redis version number of the redis code downloaded above is based on your own version. Don’t blindly Copy 2. Unzip and install a. Unzip tarzxvfredis-x.x.x.tar.gzb. Install cdredis-x.x.xmakec.make. After completion, redis-related programs (redis-cli, r

May 26, 2023 pm 05:52 PM

Ubuntu redis

How to implement Redis using HyperLogLog

1. Overview Redis added the HyperLogLog data structure in version 2.8.9 for cardinality statistics. The advantage is that when the number of input elements is very large, the space required to calculate the cardinality is relatively small and generally constant. In Redis, each HyperLogLog key only costs 12KB of memory to calculate the cardinality of nearly 2^64 different elements. This is in sharp contrast to the calculation of cardinality, where a collection with more elements consumes more memory. However, because HyperLogLog only calculates the base based on the input elements and does not store the input elements themselves, HyperLogLog cannot return each element of the input like a collection. 2. What is cardinality? For example, a data set

May 26, 2023 pm 05:41 PM

redis hyperloglog