performance engineering interview questions

Sort out some MySQL interview questions 1. How to log on to the mysql databaseMysql-u username-p 2. How to enable/disable the mysql ServiceService mysql start/stop 3. view the mysql statusService mysql status 4. How to display the number of all databasesShow databases 5. How to obtain the names and types of all field objects in the tableDescribe table_name; 6. Does MYSQL support transactions?In the default

JSP enterprise interview questions (4)5-1. Briefly describe the relationship between Servlet and JSP. JSP is implemented in another way. servlet is an earlier version of JSP. In JSP, it focuses more on the page performance, while in servlet, it focuses more on the implementation of business logic. Therefore, JSP is preferred when the page display effect is co

Regular Interview Questions and answers by a ribaba Java engineer, Baba java 1. Implementation of Spring AOP and IOC Http://blog.csdn.net/tarena_lixy/article/details/7096114 Http://blog.csdn.net/kiss_vicente/article/details/6901295 Http://blog.csdn.net/it_man/article/details/4402245 2. Distributed message queue and distributed cache Message Queue: RabbitMQ, Kafka Cache System: Redis Http://blog.csdn.net/xia

Spring, hibernate, struts interview questions, hibernatestruts 1. Is Action thread-safe? If there is no way to ensure the thread security of Action? If yes, explain the reasonNoDeclare local variables, or expand RequestProcessor to create an Action each time, or use scope = "prototype" in spring to manage 2. MVC: analyze how struts implements MVC.M: JavaBean or composed of EJB components or pojoC: Action to

. using the application eventIn an ASP . NET application, you can include a special optional file-theGlobal.asax file, also called an asp . It contains code that responds to application-level events raised by the ASP. NET or HTTP module. Iii. Summary ofapplicationInASP. 2.0in whichApplicationhas become not very important. BecauseApplicationthe self-management function is very weak, it has no similarSessiontime-out mechanism. In other words,Applicationonly manually deleted or modified to free

, frequent new/delete is bound to cause memory space discontinuity, resulting in a large number of fragments, so that program efficiency is reduced. For the stack, there is no problem, because the stack is advanced out of the queue, they are so one by one correspondence, so that there will never be a memory block from the middle of the stack poppedAllocation method: The heap is dynamically allocated and there are no statically allocated heaps. Stacks are allocated in 2 ways: static allocation an

are characterized by the inability to define variables, and all methods are abstract methods . abstract classes can have variables and do not enforce the need for abstract methods .Inheritance of class 16 and implementation of interfacesParsing: Class Inheriting the parent class implements the interface with the class, which is essentially the same. is to either extend or rewrite the parent class or interface as a template on this template. In practical programming, programmers often need to in

, and future to implement threads with return resultsThe Executorservice, callable, and future three interfaces are actually executor frameworks. The thread that returns the result is a new feature introduced in the JDK1.5, and with this feature it is no longer necessary to get the return value. And it can be flawed if it is achieved.A task that can return a value must implement the callable interface. Similarly, a task without a return value must implement the Runnable interface.After performin

most common and most effective of this attack is UDP flood attack, encountered this attack, most of the time is helpless, need to use the computer room hardware security facilities to defend. So how do you judge this attack? Very direct performance is your website can not open, bandwidth running slow, server login is not on, if you can board the server, you could use TCPDUMP-NN grab packet will find a lot of UDP packets, and very frequent. Using the

、 Controller 非常薄，只起到路由的作用，而 View 非常厚，业务逻辑都部署在 View。所以，Backbone 索性取消了 Controller，只保留一个 Router（路由器）Mvp MVP 模式将 Controller 改名为 Presenter，同时改变了通信方向。 View ==> Presenter ==> Model Model ==> Presenter ==> View 1、 各部分之间的通信，都是双向的。 2、View 与 Model 不发生联系，都通过 Presenter 传递。 3、View 非常薄，不部署任何业务逻辑，称为"被动视图"（Passive View），即没有任何主动性，而 Presenter非常厚，所有逻辑都部署在那里。MVVMMVVM 模式将 Presenter 改名为 ViewModel，基本上与 MVP 模式完全一致。 唯一的区别是，它采用双向绑定（data-binding）：View的变动，自动反映在 ViewModel，反之亦然。Angular 和 Ember 都采用这种模式。

table instead of block: You can prevent containers and * Sub-element Top-margin folding, this can make the cleaning effect and bfc,ie6/7* zoom:1;*/. Clearfix:before,.clearfix:after{content: " ";/*1*/Display:Table;/*2*/}. Clearfix:after{Clear:both;}/** * IE 6/7 use * * by triggering the haslayout implementation contains floating **/. Clearfix{*zoom:1;}13. How to create a block-level formatting context (block formatting context), BFC What is the use ofTo create a rule: root element F

DBA classic interview questions (4) 1. What if the information collection management system (ICM) crashes? Answer: All other managers will continue to work. ICM only processes the queue control request, which means to enable and disable other concurrent managers. 2. How do you accelerate the patching process? Answer: 2.1 you can merge multiple patches. 2.2 you can create a response file for a non-interactiv

Web Front-end interview questions Collection (1)-margic What is the difference between margin and padding in CSS? In Javascript, how does one detect that a variable is of the String type? Write out the function implementation. The webpage implements a countdown program to calculate the time remaining in the current year, requiring the webpage to dynamically display "xx years remaining xx days xx hou

Java multithreading interview questions Induction1. What are the implementation methods for multithreading? The following example shows the thread synchronization. (1) Java multithreading has two implementation methods: Inheriting the Thread class and implementing the Runnable interface. Thread implements the Runnable interface. Two simple thread examples: Package chc. runnable; public class ThreadTest2 {p

Java multi-thread interview questions 1. What is the difference between ArrayList and Vecoter? Similarities and differences between Array and ArrayListI. Differences between Array and ArrayList#1. variables of the Array type must be instantiated at the same time (at least the size of the Array must be initialized), while ArrayList can only be declared first.For example:Int [] array = new array [3];Or int []

Php programmer interview questions and answers Class my_class { Function my_funct ($ my_param) { User_error ("please define me", E_ERROR ); } Function B () { Return 10; } } ?> A. Multiple inheritance B. Interface C. abstract method D. private method E. function overload)7. suppose a testclass class is defined. what is the

the reuse of the cell without confusion. After the data is configured, by updating the constraint, the frame of the last control can be determined only by determining the height that the cell actually needs, and caching it, the next time it is acquired, the judgment exists, and if it exists, it returns directly. Therefore, it is calculated only once.20. How does the UITableView calculate the content height? Why does the proxy method that gets the row height call the data bar several times when

can join, can not delete the original method, but cannot add the instance variableExtension: Extension can add instance variables and methods at the same time, and the method must be implemented, can be regarded as a private classProtocol: A protocol is a list of methods that are shared by multiple classes, and the methods listed in the protocol do not have a corresponding implementationInheritance: Not only can add instance variables and methods, but also can rewrite the method of the original