关于分表的问题
请教高手以下几个问题
1.将超过100万的表就进行分表.
2.如果B数据表拆分100万的表有十个,那么A表中的ID在B表有5条数据，保存在B数据表拆分的10个表中（问题出来了，在读取数据时，不可能去读去B表中所有的表，这5条数据可能放在拆分的第5与第6个表中，如果这样我们只里要读取B表的第5个表与第6个表就行了。前提是我们根本不知道数据在那）。
回复讨论(解决方案)
关注下，最多碰过200W的数据，加索引后很见效，想了解下经过优化的单表数据上限最好是多少条
如果是普通的查询语句几百万条加了索引查询速度没问题的，但连表或子查询就比较慢了
横向分表 需要知道目标ID的位置，不然会起反作用效率更慢。
看看能不能按你的外键算法进行分表
分表是有条件的，并非简单的按记录顺序切断
比如你的 A 和 B 是按 id 关联的，那么 B 就要按 A.id 拆分
这样在已知 A.id 的情况下，按拆分规则就可推算出相关的记录会出现在哪些 Bn 中
如果你的表间存在多对多的关系，那么分表就没有意义了
此时应使用过渡表保存关联关系，查询时要分两步走，而不是一次关联所有表
由于过渡表一般只有2列，虽然记录数很多，但一次性加载到内存的可能性很大（就算是需要多次加载，但每次可加载的记录数也很多）
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
1376
52
Working with Flash Session Data in Laravel
Mar 12, 2025 pm 05:08 PM
Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-
cURL in PHP: How to Use the PHP cURL Extension in REST APIs
Mar 14, 2025 am 11:42 AM
The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.
Alipay PHP SDK transfer error: How to solve the problem of 'Cannot declare class SignData'?
Apr 01, 2025 am 07:21 AM
Alipay PHP...
Simplified HTTP Response Mocking in Laravel Tests
Mar 12, 2025 pm 05:09 PM
Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>
12 Best PHP Chat Scripts on CodeCanyon
Mar 13, 2025 pm 12:08 PM
Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom
Explain the concept of late static binding in PHP.
Mar 21, 2025 pm 01:33 PM
Article discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo
Framework Security Features: Protecting against vulnerabilities.
Mar 28, 2025 pm 05:11 PM
Article discusses essential security features in frameworks to protect against vulnerabilities, including input validation, authentication, and regular updates.
Customizing/Extending Frameworks: How to add custom functionality.
Mar 28, 2025 pm 05:12 PM
The article discusses adding custom functionality to frameworks, focusing on understanding architecture, identifying extension points, and best practices for integration and debugging.
