


How to prevent duplication of the auto-incrementing primary key of a high-concurrency website?
For example, the Weibo id of Sina Weibo, the user uid of registered users, the post number tid of Baidu Tieba, etc. I have observed that they all show an increasing relationship according to the publishing time, but I am very curious about this high concurrency Websites are generally distributed databases. There must be cache, message queue and other middleware before the database. So how to ensure that when multiple databases are finally inserted into multiple databases, there will be no duplication when the primary keys between them are automatically incremented?
And there are many random ID generation algorithms with low collision probability. Why are they not used by these high-concurrency websites? Is it due to efficiency?
Reply content:
For example, the Weibo id of Sina Weibo, the user uid of registered users, the post number tid of Baidu Tieba, etc. I have observed that they all show an increasing relationship according to the publishing time, but I am very curious about this high concurrency Websites are generally distributed databases. There must be cache, message queue and other middleware before the database. So how to ensure that when multiple databases are finally inserted into multiple databases, there will be no duplication when the primary keys between them are automatically incremented?
And there are many random ID generation algorithms with low collision probability. Why are they not used by these high-concurrency websites? Is it due to efficiency?
I would like to recommend you a knowledge article about the popular scienceID generator or global number generator
http://weibo.com/p/1001603800404851831206
Then I recommend an ID generator implemented in PHP named SnowFlake internally by Twitter
https://github.com/sschiau/Particle.php
I'm ready to start talking nonsense. . . .
The system starts from scratch, mostly from small to large.
In the beginning, money was scarce and time was tight. Naturally, whatever was officially supported was used, and whatever was simple and easy to maintain was used. If the later conversion costs are high, the risks are high, and the returns are low, who is going to deal with all this?
Secondly, with high concurrency, most of them will not be written concurrently.
Finally, even if you encounter the situation you mentioned, you can set up a number sender and send a self-increasing ID. Okay, now the question is, how to set up a distributed dispatcher. . .

ThesecrettokeepingaPHP-poweredwebsiterunningsmoothlyunderheavyloadinvolvesseveralkeystrategies:1)ImplementopcodecachingwithOPcachetoreducescriptexecutiontime,2)UsedatabasequerycachingwithRedistolessendatabaseload,3)LeverageCDNslikeCloudflareforservin

You should care about DependencyInjection(DI) because it makes your code clearer and easier to maintain. 1) DI makes it more modular by decoupling classes, 2) improves the convenience of testing and code flexibility, 3) Use DI containers to manage complex dependencies, but pay attention to performance impact and circular dependencies, 4) The best practice is to rely on abstract interfaces to achieve loose coupling.

Yes,optimizingaPHPapplicationispossibleandessential.1)ImplementcachingusingAPCutoreducedatabaseload.2)Optimizedatabaseswithindexing,efficientqueries,andconnectionpooling.3)Enhancecodewithbuilt-infunctions,avoidingglobalvariables,andusingopcodecaching

ThekeystrategiestosignificantlyboostPHPapplicationperformanceare:1)UseopcodecachinglikeOPcachetoreduceexecutiontime,2)Optimizedatabaseinteractionswithpreparedstatementsandproperindexing,3)ConfigurewebserverslikeNginxwithPHP-FPMforbetterperformance,4)

APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

PHPemailvalidationinvolvesthreesteps:1)Formatvalidationusingregularexpressionstochecktheemailformat;2)DNSvalidationtoensurethedomainhasavalidMXrecord;3)SMTPvalidation,themostthoroughmethod,whichchecksifthemailboxexistsbyconnectingtotheSMTPserver.Impl


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

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

SublimeText3 Chinese version
Chinese version, very easy to use

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Zend Studio 13.0.1
Powerful PHP integrated development environment

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
