让memcached和mysql更好的工作
这次是Fotolog的经验，传说中比Flickr更大的网站，Fotolog在21台服务器上部署了51个memcached实例，总计有254G缓存空间可用，缓存了多达175G的内容，这个数量比很多网站的数据库都要大的多，原文是A Bunch of Great Strategies for Using Memcached and MySQ
这次是Fotolog的经验，传说中比Flickr更大的网站，Fotolog在21台服务器上部署了51个memcached实例，总计有254G缓存空间可用，缓存了多达175G的内容，这个数量比很多网站的数据库都要大的多，原文是A Bunch of Great Strategies for Using Memcached and MySQL Better Together，我这里还是选择性的翻译以及按照我的理解补充，感谢Todd Hoff，总能给我们一些学习的案例，从这里也能看出国外技术的开放态度，不似我们，其实就那么点小九九还藏着掖着，好了，进入正题。
一、关于memcached
还不知道这个?那你去面试的时候要吃亏了，赶紧去官方网站看一下，另外google一下用法，硬盘总是太慢，把数据存在内存里面吧，如果你只有一台服务器，推荐用一下APC(Facebook在用)或者eaccelerator或者Xcache(国人开发的)，这些产品单机效果更好，如果你需要分布式的缓存方案，那么用memcached吧。
二、memcached如何与mysql并肩作战?
通过数据库分片来解决数据库写扩展的问题把数据库分片，部署到不同的服务器上，免得只有一个主服务器，写操作成为瓶颈以及可能有的“单点故障”，一般的数据库分片主要是按照业务来分，尽可能的拆分业务，不相干的都独立起来做成服务也好
前 端mysql和一堆memcached服务器来应付读的问题应用程序首先从memcached中获取数据，获取不到再从数据库中获得并保存在 memcached中，以前看过一篇文章说好的应用95%的数据从memcache的中获得，3%的数据从mysql的query cache中获得，剩下2%才去查表，对比一下你的应用，差距有多远?
通过mysql复制(master-slave)来解决读的问题
首先mysql数据库通过master-slave读写分离，多个slave来应对应用程序读的操作。
三、为什么不用mysql的query cache?
我们都知道mysql有个query cache，可以缓存上次查询的结果，可实际上帮不上太多的忙，下面是mysql quety cache的不足：
只能有一个实例
意味着你能存储内容的上限就是你服务器的可用内存，一台服务器能有多少内存?你又能存多少呢?
只要有写操作，mysql的query cache就失效
只要数据库内容稍有改变，那怕改变的是其他行，mysql的query cache也会失效
mysql的query cache只能缓存数据库数据行
意味着其他内容都不行，比如数组，比如对象，而memcached理论上可以缓存任何内容，，甚至文件^_^
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
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
1662
14
1419
52
1311
25
1261
29
1234
24
MySQL's Role: Databases in Web Applications
Apr 17, 2025 am 12:23 AM
The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.
Laravel Introduction Example
Apr 18, 2025 pm 12:45 PM
Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.
How to start mysql by docker
Apr 15, 2025 pm 12:09 PM
The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database
MySQL and phpMyAdmin: Core Features and Functions
Apr 22, 2025 am 12:12 AM
MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.
Solve database connection problem: a practical case of using minii/db library
Apr 18, 2025 am 07:09 AM
I encountered a tricky problem when developing a small application: the need to quickly integrate a lightweight database operation library. After trying multiple libraries, I found that they either have too much functionality or are not very compatible. Eventually, I found minii/db, a simplified version based on Yii2 that solved my problem perfectly.
MySQL vs. Other Programming Languages: A Comparison
Apr 19, 2025 am 12:22 AM
Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.
Laravel framework installation method
Apr 18, 2025 pm 12:54 PM
Article summary: This article provides detailed step-by-step instructions to guide readers on how to easily install the Laravel framework. Laravel is a powerful PHP framework that speeds up the development process of web applications. This tutorial covers the installation process from system requirements to configuring databases and setting up routing. By following these steps, readers can quickly and efficiently lay a solid foundation for their Laravel project.
MySQL for Beginners: Getting Started with Database Management
Apr 18, 2025 am 12:10 AM
The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA
