earthing techniques

When the vertical expansion of the Web server becomes expensive or difficult, we need to consider the level of server expansion, namely load balancing technology. There are many techniques for load balancing, which we'll cover here.1.HTTP redirectionWe can do this at the code level by setting access to specific pages such as index.php, setting the location value of the header in the PHP code, and returning the redirect instruction. This is actually th

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Ext.: http://www.fmi.com.cn/index.php?m=contentc=indexa=showcatid=9id=500415Methods and techniques for effective communicationWhen we anciently with our customers, we inevitably encounter the feelings and words that our customers misunderstand and even appear dissatisfied with, when we have misunderstandings or communication obstacles, how do we deal with them?Do you often hear the words, "You don't know what I'm saying", "You're not thinking about ot

This article mainly introduces the regular expression matching techniques that do not contain certain strings, and details the reasons for doing so, if you want to find the text that does not contain a certain string, you can refer to it. the programmer can use it in a regular expression, ^ (hede) to filter the "hede" string, but this method is incorrect. We can write it like this: [^ hede], but such a regular expression completely means that the stri

Optimization debugging techniques and skills for PHP programmers. This article describes various methods for debugging PHP applications, including opening error reports in ApacheandPHP and placing strategic print statements in a simple PHP script, find out how to Debug PHP applications, including opening error reports in Apache and PHP, and placing strategic print statements in a simple PHP script, find the source of a more difficult bug. The PHPEclip

Test Design techniques-state BASED Testing-test note of "Essential software Test Design"2015-08-19Content:13.1 The Model13.1.1 the ATM Machine13.2 Creating Base Test Cases13.2.1 Ways of covering the Graph13.2.2 Coverage According to Chow13.2.3 Creating Test Cases13.2.4 Transition Pairs13.2.4.1 expanding the Table by one Column13.2.4.2 Creating a Dual Graph13.2.5 Transition Triples and moreA state of GRAPH, or state transition testing, was a model-base

Take ArcGIS, for example, to introduce the techniques of geo-vectorization in combination with your years of work experience.　　First, the registration of the BasemapThere are different registration accuracy requirements for different scale maps:1:200,000 geological map, the registration error can not be higher than 20 meters;1:500,000 geological map, the registration error can not be higher than 50 meters.Scanning quality of the original map, only nee

Several important practical application techniques for jquery:1. References to page elementsThe jquery object is not able to invoke the method defined by the DOM directly through the jquery selector, for example:$ ("#mytest"). Text (); // gets the text content in the element with ID mytest $ ("#mytest"). getElementsByTagName ("Li"); // An error occurs because getElementsByTagName () is a DOM element method. Conversion of 2.jQuery objects to DOM object

Python optimization techniques: Using ctypes to improve execution speed, pythonctypes First, I would like to share with you a small pitfall when using python's ctypes to call the c library. This issue is caused by a C function. The returned value is the string address generated by malloc. It is normal to use, but it has been used for a period of time and no exception is found. In this test, we found that a "segment error" occurs during the use of this

Several people have asked me, what is the most useful or best programming language suitable for learning?Let's skip html/css, I think the answer depends on what you want to do with programming.Essentials Quick FactsJavaScript and its framework are very useful for situations where a project is built in only one language.Angular.js can control the front end of the website that is presented to the user.node. JS will be the Web server that manages all content on the site.Express.js runs between the

After being immersed in coding for a while (for example, I've been in the program for almost 20 years or so), you'll be getting used to these things all the time. Because, you know ...Anything can go wrong, yes, it does.That's why we use defensive programming, which is the reason for some paranoid habits. Here are some of the 10 most useful but paranoid Java programming techniques I personally consider. Let's take a look:Put string string in frontTo p

, our optimization goal is to:Margin (b,w) indicates that the point-to-line distance is determined by B and W, and our goal is to maximize it, that is, to find the "fattest" B and w from the point-to-line distance;Every yn (wtxn+b) >0 indicates that each point (Xn,yn) can have a line separating them;With some scaling techniques, the value of yn (wtxn+b) is 1, so the margin (b,w) is simplified.The margin is then simplified into:The restrictions were re

This section is about the nuclear svm,andrew Ng's handout, which is also well-spoken.The first is kernel trick, which uses nuclear techniques to simplify the calculation of low-dimensional features by mapping high-dimensional features. The handout also speaks of the determination of the kernel function, that is, what function K can use kernel trick.In addition, the kernel function can measure the similarity of two features, the greater the value, the

The repetition of VIM techniques Type of vim repetition Duplicate text changes In-line Find duplicates Full-text lookup duplicates Text repeat substitution Duplicate macro Recording The repetition of VIM techniquesWhen we vim edit the text, we will inevitably do some repetitive operation, when we want to repeat the last operation, do we have to repeat the same operation? This will inevitably waste time. Then vim you record

Troubleshooting and remediation techniques for Linux systemsI found that the Linux system in the boot process will have some failures, causing the system to not start normally, I wrote here a few application of single user mode, Grub command operation, Linux Rescue mode of the failure to repair cases to help you understand the resolution of such problems.(i) Single user modeLinux systems provide single-user mode (similar to Windows Safe Mode) for syst

SOURCE : Tpircsboy's blog (@churechill123) Many people who have used Linux for a period of time have already been able to play the basics of Linux in some basic ways, but without systematic learning it is easy to lack some practical skills. This series of articles describes some of the techniques that can improve the effectiveness of bash, mainly about historical command operations and some shortcut keys, so that you double your productivity at the co

Google engineers have developed a machine learning algorithm for translating picture themes using techniques similar to language translationThe automatic translation of one language into another language has always been a difficult problem to overcome. But in recent years, Google has changed the traditional translation process by developing machine translation algorithms, and has fundamentally changed the cross-cultural translation exchange through Go

Tags: SQL optimizationThe most common way to improve the efficiency of SQL statements is to build indexes and avoid full table scans as much as possible. Let's tidy up some common SQL optimization techniques to avoid full table scanning. A simple optimization may be able to make your SQL execution efficiency several times, even dozens of times times.1. Avoid using is null or is not NULL in the WHERE clause to judge a field. Such as: Select ID from ta

8 ASP Coding Optimization Techniques: 1. Declaring VBScript variablesIn ASP, there is strong support for VBScript, the ability to seamlessly integrate VBScript functions, methods, so as to extend the existing functionality of the ASP to provide a great convenience. Since the concept of variable types has been blurred in ASP, many programmers are wont to declare VBScript variables in the process of interacting with VBScript, thus aggravating the resol

Three common techniques for Excel to remove duplicates In other scenarios, users may want to find and remove duplicates that are the same but not completely duplicated in a few fields, such as the contents of the "Name" field in line 7th and row 12th in the following figure, but the contents of the other fields are not exactly the same. These two types of duplicates are different, in the elimination of the implementation of the operati