agile advantages and disadvantages

Object-oriented and process-oriented programming can only be used in many programming languages, but PHP is different from other programming languages, that is, we can freely choose orIf you are new to PHP, writing code in PHP's process-oriented style may be your only choice. However, if you often go to PHP forums and newsgroups, you should see articles about "objects. You may also see tutorials on How to Write object-oriented PHP code. Or you may have downloaded some ready-made class libraries

software similar to Nginx/lvs/haproxy, which is implemented at the software level, so it's very inexpensive.At present, the structure of the Web site architecture is generally more reasonable: the Web front-end uses nginx/haproxy+keepalived as the load balancer, and the backend uses the MySQL database as a master and read-write separation, using the lvs+keepalived architecture. Of course, according to the specific needs of the project plan.The following is the respective characteristics and app

1, Nginx advantages compared to Apache:Nginx lightweight, the same Web services, more than Apache occupy less memory resources;Anti-concurrency, Nginx processing request is asynchronous non-blocking type, Apache processing request is blocking type, so in dealing with high concurrency is nginx can keep low resource consumption and high performance;Highly modular design, relatively simple to write modulesHigh-performance modules produced quickly;The

implemented with LUA Apache is the most popular, why? Most people are lazy to update to nginx or learn new things # # ...12, for Nginx, I like it configuration file written very concise, regular configuration makes a lot of things easy to run high efficiency, less resources, powerful proxy, very suitable for the front-end response server# #看了一下, nginx configuration file is really more concise and easy to understand13. Apache in the processing of dynamic has

sample cardinality (up to 200), and some combine two sub models to handle both fast and slow updates. In fact, the selection of replaced samples to update the background model, in essence, is the sample life problem, the traditional way to use the first out of the replacement strategy. The probability of each sample being selected as a replacement sample is equal in the vibe background model, which is independent of the length of the sample's existence time, which guarantees that the sample lif

non-blocking I/O, transmit/listen events to control the execution processNodejs encountered I/O event will create a thread to execute, and then the main thread will continue to execute, therefore, take the action of profile to trigger an I/O event, will immediately execute the action of taking timeline, two actions parallel execution, if each need 1S, then the total time is 1S. After their I/O operations are completed, an event, profile, and timeline are emitted, and the event agent receives an

advantages and disadvantages of JSONP1. Advantages1.1 It is not limited by the same Origin policy as the AJAX request implemented by the XMLHttpRequest object, Jsonp can cross the homologous strategy;1.2 Its compatibility is better, can run in the older browser, do not need XMLHttpRequest or ActiveX support1.3 The result can be returned by calling callback after the request is complete. The permission of th

practice of solving disadvantage 2:Add a Readresolve () method. public class Elvis implements Serializable { /** * */ private static final long Serialversionuid = 1l; public static final Elvis INSTANCE = new Elvis (); Private String one; Private Elvis () { } public void Leavethebuilding () { System. Out.println ("Whoa baby, I ' M outta here!"); } Private Object Readresolve () { //Return The one true Elvis and let the garbage collector//Take care of t

B/S and C/S software architecture. 　　B/SYesBrowser/ServerIt refers to the browser and server. No special software is installed on the client. You only need one browser (thin client) 　　C/SYesClient/ServerThe client and server can access the server (fat client) only after the client software and corresponding environment are installed on the client) Comparison of advantages and disadvantages of B/S and C/S: 1

Like many Apache projects such as Tomcat and turbine, Struts is an open-source software, which has a major advantage. This allows developers to gain a deeper understanding of their internal implementation mechanisms. The struts open source framework is created to make it easier for developers to build Web applications based on Java Servlet and JavaServer Pages (JSP) technology. The Struts framework provides a unified standard framework for openers. By using struts as the basis, developers can fo

and efficient, and can be considered as the perfect solution for real-time application systems in data-intensive distributed deployment environments. node is ideal for scenarios where you anticipate a high level of traffic before responding to the client, but not necessarily a lot of the server-side logic and processing required.node. JS Disadvantages:1. Low Reliability2, single process, single-threaded, only support single-core CPU, can not fully ut

This. UserName =UName;3 This. Showusername =Showusername;4 }5 functionShowusername () {6 return This. UserName;7 }8 varObj1 =NewCreateobj (' Ghostwu ');9 varObj2 =NewCreateobj (' Wei Zhuang '));TenConsole.log (Obj1.showusername = = = Obj2.showusername);//trueThe method of the object points to the same global function showusername, although several replication problems have been solved, but the global function is very

Detailed introduction of the advantages and disadvantages of the CSS framework for your reference. the benefits of CSS frameworks : 1, the development efficiency enhancement.If you are a front-end development of a corporate site, believe that most of the time to do similar sites code work. A well-defined framework can greatly improve your productivity and avoid some common mistakes. If your job is to be bi

The advantages of MongoDB compared to relational databases:① Weak consistency (eventually consistent), to ensure the user's access speed:For example, in a traditional relational database, a count type of operation locks the dataset so that the exact value in the "current" case can be guaranteed. This is important in some cases, such as checking account information through ATM, but for Wordnik, the data is constantly being updated and growing, and this

When multithreading technology is used and when to avoid it is an important topic we need to master. Multithreading is a double-edged sword. Its advantages and disadvantages must be fully considered during use.Multi-threaded processing can run multiple threads at the same time. Multi-threaded applicationsProgramDividing programs into multiple independent tasks can significantly improve performance in the fo