Database Performance Tips for Developers对于开发人员的数据库性能技巧 As a developer you may or may not need to go into the database and write queries or design tables and indexes, or help determine configuration of your SQL Server systems. But if you do, these tip…

(27)Throw hardware at the problem, not developers 招数27: 把问题仍给硬件而不是开发人员 As developers, we often want to fix problems with code, but don’t be afraid to ‘put the compiler down’ and throw some hardware at the problem.作为开发人员,我们通常想通过代码解决问题,但不要害怕‘批评编译器’和把问题…

(2)Remove unused View Engines 招数2: 移除不用的视图引擎 If you're an ASP.NET MVC developer, you might not know that ASP.NET still loads the View Engines for both Razor and Web Forms by default. This can cause performance issues because MVC will normally look fo…

(17)Avoid running sites in debug mode 招数17: 避免在调试模式下运行网站 When it comes to ASP.NET, one of the most common performance blunders I see on a regular basis is accidentally or intentionally running sites in debug mode. Language-level optimizations, such a…

(13)Always perform validation on the server as well 招数13: 总是在服务器端执行验证 This isn’t exactly a performance tip but rather a security tip for when people think that they could improve performance by cutting out server-side validation. These days, client-s…

ORM TipsORM小窍门 More and more people are using Object to Relational Mapping (ORM) tools to jump the divide between application code that is object oriented and a database that is storing information in a relational manner. These tools are excellent an…

(39)Avoid using session state 招数39: 避免使用会话状态 Where possible, you should try and avoid using session state. Whilst using one web server, performance is usually not a problem. This changes as soon as you need to scale to multiple servers, as different,…

(32)Seven handy ViewState tips 招数32: 7条便利的ViewState技巧 Every time I have to deal with a classic ASP.NET Web Forms application, one of the first things I look at is the resulting source, to check whether the DOM is a complete mess and whether the ViewS…

(30)Static collections 招数30: 静态集合 If a collection is static, make sure it only contains the objects you need. If the collection is iterated over often, then the performance can be slow if you don’t remove unnecessary objects. Objects in a collection…

(29)Before tackling any website performance issue, first verify the problem isn’t on the client 招数29: 在处理网站性能问题前,首先验证问题是否出在客户端 Traditionally, many performance problems have been rooted in either the database or application server. 习惯上,许多性能问题要么根植于数据库或…

(28)Don’t assume that problems can only arise from business logic 招数28: 不要认为问题只会从业务层产生 When beginning to diagnose performance problems, we often assume the problem is in our business logic. Don’t forget that the areas of our code that provide infrast…

(26)Don’t underestimate the value of the UI when tackling performance problems 招数26: 解决性能问题时不要低估UI的价值 Simple UI tricks, such as progress bars, redirecting users’ attention using animation, or placing slower loading sections at the bottom of a page or…

(25)Use the startMode attribute to reduce the load time for your ASP.NET site 招数25: 使用startMode属性来减少ASP.NET站点加载时间 Every time you update your site, IIS must recompile it during the first request, so the initial request takes significantly longer than…

(16)Reduce the data sent across the network 招数16: 减少通过网络发送的数据 Reducing the amount of data sent across the network can improve application performance significantly. Compressing CSS and JavaScript is possible using bundling and minification. This will…

(14)Review what client scripts you are using 招数14: 检查你使用了什么客户端脚本 Out of the box, many ASP.NET projects include client script libraries which you may or may not beusing. It’s always a good idea to check what you are using, and when.拿来即用,很多ASP.NET项目包括你…

(11)Make sure paging is conducted at the database layer 招数11: 确保分页是在数据层完成的 When using grid UI controls (framework based, or 3rd party owned), you should carefully consider how paging is implemented. Many controls implement paging in a simplistic fash…

(4)A selection of tips 招数4: 精选的技巧 Make sure HTTP compression is turned on for any uncompressed content. HTML in particular compresses significantly, and in this era of mobile friendliness and slow 3G connections, that’s essential.确保为未压缩的内容打开HTTP压缩.在这…

(1)Caching is a last resort 招数1: 缓存是最后的手段 Projects that use multiple levels of cache often demonstrate a misunderstanding of why caching is required in the first place. 项目中使用多重缓存经常会表现会产生误会,为什么缓存是第一步必须的. Caching is not synonymous with performance. You…

(41)StringBuilder is NOT the answer for all string concatenation scenarios; String.Join could be 招数41: StringBuilder不适用于所有字符串连接的场景:String.Join可能是 Yes, if you are in a loop and adding to a string, then a StringBuilder *could* be most appropriate. Howe…

(40)Take advantage of .NET 4.5 async constructs 招数40: 利用.NET 4.5异步结构 With the arrival of .NET 4.5, writing async code correctly is easier than ever. Like any tool, it should be only applied where it makes most sense – in web use-cases this usually re…

(31)Know your loops 招数31: 认识你的循环 for is the fastest way of iterating over a collection, foreach is a little slower, and LINQ queries are slowest.for是遍历集合最快的方法,foreach略慢一些,LINQ查询最慢. 测试代码: using System; using System.Collections.Generic; using System.Li…

(19)A selection of tips 招数19: 精选技巧集合 Including height and width in <img /> tags will allow your page to render more quickly, because space can be allocated for the image before it is downloaded.在<img />标签中包括height和width属性会加速你的页面呈现,因为下载完成之前空间可以…

(18)When in production, carefully consider what you need to log 招数18: 在生产环境,仔细考虑你需要记录哪些日志 Many people deploy to production without checking how logging is currently configured. It is always advisable to check whether your policy is to have logging on…

(15)Reduce memory leaks dramatically with the “using” statement 招数15: 显式的使用using语句减少内存泄露 If a type implements IDisposable, wrap the use of it in a “using” statement, so that it automatically disposes of objects properly when the block exits.如果一个类实现了I…

(12)For a snappy user experience, always validate on the client 招数12: 为了生动的用户体验,总是在客户端验证 To avoid unnecessary round trips to the server, validate form entries on the client using JavaScript before posting them. This provides quick feedback and makes…

(3)Use Microsoft’s PDBs to debug or profile external assemblies or libraries 招数3: 使用Microsoft的PDBs调试和分析外部的程序集和库 To accurately debug or profile an external assembly or library (i.e. one you’re not directly compiling), you need the PDB files that accom…

一.性能优化考虑点 1.当前系统结构瓶颈 通过压力测试观察指标.日志检测.性能分析 2.了解业务模式 接口业务类型.系统层次化结构 3.性能与安全 二.ab接口压力测试工具 1.安装:yum -y install httpd-tools 2.使用: ad -n 2000 -c 2 http://127.0.0.1-n:总的请求数-c:并发数-k:是否开始长连接 准备环境 检查语法,并重载nginx -tc /etc/nginx/nginx.conf nginx -s reload -c /etc…

ADO 简介 在 ASP 中访问数据库使用的 ADO 组件. ADO 是一项微软的技术. ADO 指 ActiveX 数据对象(ActiveX Data Objects). ADO 是微软的 Active-X 组件. ADO 会随 IIS 被自动安装 ADO 是一个访问数据库中数据的编程接口 从 ASP 页面访问数据的方法 创建一个到数据库的 ADO 连接 打开数据库连接 创建 ADO 记录集 从记录集提取您需要的数据 关闭记录集 关闭连接 ADO 数据库连接 在进行数据访问前,我们首先先要建立…

TaiShan特战队六月底成立,至今百日有余,恰逢1024程序员节,遂整理此文,献礼致敬!希望能为广大在鲲鹏处理器上开发软件.性能调优的程序员们,提供一点帮助.从今天开始,将陆续推出性能调优专题文章.原贴链接:https://bbs.huaweicloud.com/blogs/126594 1.1 鲲鹏处理器NUMA简介 随着现代社会信息化.智能化的飞速发展,越来越多的设备接入互联网.物联网.车联网,从而催生了庞大的计算需求.但是功耗墙问题以功耗和冷却两大限制极大的影响了单核算力的发展.为了满足…

性能测试工具Jmeter由于其体积小.使用方便.学习成本低等原因,在现在的性能测试过程中,使用率越来越高,但其本身也有一定的缺点,比如提供的测试结果可视化做的很一般. 不过从3.0版本开始,jmeter引入了Dashboard Report模块,用于生成HTML类型的可视化图形报告(3.0版本的Dashboard Report模块会中文乱码,因此建议使用3.0以上的版本). 这篇博客,简单介绍下在利用jmeter进行性能测试时,生成HTML的可视化测试报告... 一.生成HTML测试报告的两种方…