performance engineering interview questions

Bjarne stroustrup is the designer and originalimplementer of C ++ and the author of "The C ++ programming language" and "the design and evolution of c ++ ". his research interests includedistributed systems, design, programming techniques, softwaredevelopment tools, and programming languages. he is actively involvedin the ANSI/iso standardization of c ++. Dr. stroustrup is the college of engineeringchair sort sor in computer science at Texas A M University. heretains a link with att labs-resear

One set of PHP interview questions 1. the Statement include and require can include another file to the current file. The difference between them is ___. to avoid including the same file, which of the following statements can be used to replace them. 1. when the PHP program executes require (), it will only read the file once, so it is often placed at the beginning of the program. after the file is intr

ASP and net interview questions 1. Briefly describe the access permissions of private, protected, public, and internal modifiers.A. Private: Private Members can be accessed within the class.Protected: protects members, which can be accessed within the class and in the inheritance class.Public: A Public member. It is completely public and has no access restrictions.Internal: accessible within the same name

Analysis and Summary of Baidu Java R D interview questions 1. Analysis of Common application scenarios in singleton mode. Among the 23 design modes, the singleton mode is the largest. It is easy to understand, but applicable to scenarios. Are you really familiar with this? The use of Singleton is because there is no need to create an object for each request, which wastes both CPU and memory. The use of mu

Android interview questions 1. Whether the process of android dvm is the same concept as that of Linux: A: dvm is a dalivk virtual machine. Every android application runs in its own process and has a dalivk Virtual Machine instance. Every dvm is a process in linux. Therefore, it can be considered the same concept. 2. What types of android animations are available? What are their characteristics and differen

after the real object is called.Proxy mode,The proxy class and the proxy class implement the same interfaceAn instance of a proxy class in a proxy classBehavioral patterns: Focus on communication between objectsSuch as: Responsibility chain mode, iterator mode, command modeResponsibility chain ModelSimilar interceptors, etc.Command mode:Separates callers from Callee's behaviorInterpreter mode:Each syntax is an interpreter classIterator mode:Change the collection class's view traversal and add a

security.Even so far, some people don't even know the basic semantics of SQL syntax.String sql = "SELECT * from Tb_name where name= '" +varname+ "' and passwd= '" +varpasswd+ "'";If we pass [' or ' 1 ' = ' 1] in as varpasswd. User name feel free to see what will become?SELECT * from tb_name = ' random ' and passwd = ' or ' 1 ' = ' 1 ';Because ' 1 ' = ' 1 ' is sure to be true, so you can pass any validation. What's more:Put [';d rop table tb_name;] Incoming in as VARPASSWD:SELECT * from tb_name

. In Mixed mode, MySQL distinguishes between the log forms of treated records based on each specific SQL statement executed, that is, choosing between statement and row. The statment in the new version is still the same as before, recording only the statements executed. The new version of MySQL in the row mode is also optimized, not all changes will be in the row mode to record, such as when the table structure changes will be recorded in the statement mode, if the SQL statement is actually upda

client. The expression is defined between the two tags, 9. What does the implied object mean? What are the hidden objects?JSP implied objects are some Java objects in the page, and the JSP container allows these Java objects to be used by developers. Developers can use them directly without a clear statement. JSP implicit objects are also called predefined variables. The following lists the implied objects in the JSP page:ApplicationPageRequestResponseSessionexceptionOutConfigPageContext

multiple times, a new record is inserted due to the submission of other transactions, resulting in a different result of each query;The difference is:Unread read: Will cause dirty reading, non-repetition reading, phantom reading;Submit read: Will not cause dirty reading, but there will be non-repetition read, Phantom read;Repeat read: May cause phantom reading;Serial read: Does not cause dirty reading, non-repetition reading, phantom reading; - , there are large fields in the table X (for examp

simple example: 7. What media labels are available in addition to audio and VIDEO,HTML5?HTML5 provides strong support for multimedia, with the following tags supported in addition to audio and video tags: 8. What is the use of HTML5 Canvas elements?the Canvas element is used to draw a graphic on a Web page, and the element tag is powerful in that it can be graphically manipulated directly on HTML . 9, HTML5 storage types? HTML5 can store data locally, It was used in the past with coo

inherit it. Subclass overwrites the finalize () method to sort system resources or perform other cleanup tasks. The finalize () method is called before the Garbage Collector deletes an object. Second, can anonymous inner class (anonymous internal class) be extends (inherited) other classes, or implements (implemented) interface (Interface )? An anonymous internal class is an internal class without a name. It cannot be extends (inherited) other classes, but an internal class can be used as an in

finalize () method to sort system resources or perform other cleanup tasks. The finalize () method is called before the Garbage Collector deletes an object. Second, can anonymous inner class (anonymous internal class) be extends (inherited) other classes, or implements (implemented) interface (Interface )? An anonymous internal class is an internal class without a name. It cannot be extends (inherited) other classes, but an internal class can be used as an interface and implemented by another i

reference from the asyncio module, and then throw the coroutine to be executed into eventloop for execution, so that asynchronous Io is realized. 33. Briefly describe the functions and application scenarios of the gevent module.When a greenlet encounters an I/O operation, such as accessing the network, it will automatically switch to another greenlet. After the I/O operation is completed, it will switch back to continue execution when appropriate. Since Io operations are very time-consuming, th

This program code has the "IP address forgery" vulnerability. how can this problem be solved? PHP interview questions, including php Basics, mysql, network, and front-end knowledge Php Basics 1. what are the output results of the following php code?$ I = 10; $ N = $ I ++; Echo $ n, $ I ++, ++ $ I 2. what is the difference between include and require?3. the following code is used to determine whether the

Sp. Net interview questions (To original address http://blog.sina.com.cn/s/blog_524c848901009e7b.html ~ Type = v5_one label = rela_nextarticle author Li Yang's blog http://blog.sina.com.cn/liiyang) 1. Briefly describe the access permissions of private, protected, public, and internal modifiers. A. Private: Private Members can be accessed within the class. Protected: protects members, which can be accesse

in February. The first day of 1751 in England was March 25, 11 days worse than France.After the United States adopted the Gregorian calendar, it went back hundreds of years, so that the dates originally recorded could be expressed in two calendars (usually to provide two dates for more precise purposes). For example, George Washington's birthday changed from February 1731 11 to February 1732 22.When you read a volatile variable in a thread, you can eventually read the value that it updated.A f

dispatch and dispatch, and a smaller unit that can run independently than a process. Thread's StrokeThe sub-scale is less than the process, which makes the multi-threaded procedure highly concurrency, and the process typically has independent memory units at execution time, while the threads can share memory. Programming with multithreading often leads to better performance and user experience,But multithreaded programs are unfriendly to other progra

This article originates from: http://www.dbasupport.com The answer here is not very comprehensive, these questions can be explained through a number of angles, perhaps you do not have to give a full answer in the interview process, only through your answers to the interviewer to understand your understanding of the Oracle concept. 1. Explain the different points of cold and hot backup and their advantages

Summary of the interview questions of Spring and SPRINGMVC Application scenarios, AOP principles, benefits of AOP in 1.Spring. A: Aop--aspect oriented programming is programming for facets and is used to encapsulate crosscutting concerns in the following scenarios: Authentication permissions, Caching cache, context passing content delivery, error handling Errors handling lazy loading lazy loading, debuggin