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free, but he said to me, "You overestimate yourself ". However, I am still engaged in the business world. [Applause] I promise that you will be successful in any field that interests you. This is beyond doubt. Don't let others tell you what to do. You should find it by yourself. [Applause] Buffett: Becky, if you had a wonderful farm and you knew the next 50 years there wocould be five droughts but there wocould be 45 good years, I mean, you wocould not become paralyzed thinking about the five

Although the data has been in use for a long time, it is of great reference value: Lucene. commit. batch. size = 0Lucene. commit. time. interval = 0 These properties allow commits in batch, you can either set how many document changes a batch will contain (commit will happen after X docs are modified) or set a time interval in milliseconds (commit will happen every X milliseconds ). Lucene. buffer. size =

speed; The data layer design of database and table sharding is not perfect. What will happen when the DB server on a node goes down? Yes, we have adopted the database splitting solution. That is to say, there are N machines that constitute a complete database. If one machine goes down, it's just that the data in one DB's N points cannot be accessed. This is acceptable. At least it is much better than before splitting, so the whole DB won't be accessi

Detailed description of condition Variables At the end of the previous article, I described a special problem: If the thread is waiting for a specific condition to happen, how should it handle this situation? It can repeatedly lock and unlock mutex objects. Each time it checks the shared data structure to find a value. However, this is a waste of time and resources, and the efficiency of such busy queries is very low. The best way to solve this proble

Document directory 8 years of mobile video calls Today's mobile video calls Key to mobile video call applications Where is a mobile video call used? What will happen in the future? I saw a good article on the Internet and reproduced it. For more information, see the appendix below. This articleChapter reminds people of the opinions of an expert on 3G many years ago. China Mobile, China Telecom, and China Unicom are all pushing their 3G mobile

prototype implies the meaning of extern, so you don't need to worry about this problem. C) repeated definitions, repeated declarations, and conflict types:Consider if # include two files a in a C source code file. H and B. h, and. h # include B. H (the reason is B. file H defines. h), what will happen? At this time, the C source code file # include B. H twice. Therefore, # define in B. H occurs twice, and each declaration occurs twice. In theo

When we recall the process of software development, the first 10 years of the 21st century may be the Agile age. Agile Development developed from a large number of consultants who stated software development methods at the meeting. Now we have held a meeting dedicated to Agile development. Agility is no longer an exclusive discussion of a small number of people; the main interest of the entire software development organization is now extended to a wide range of technical and application fields.

situations will cause data updates, If KVC/kvo is used, this will solve the problem. You don't have to worry about the number of data records appended or updated. The following describes how to add data: Implement insertObject: inKeyAtIndex: Or insertKey: atIndexes. At the same time, in kvo, we can use the change dictionary to find out what kind of change has taken place and handle it accordingly. Add an example: Click to download 1. Person class@ Implementation Person @ synthesize name, age;

YT14-HDU-James hop bridge, yt14-hdu-james Problem DescriptionOnce again, James Bond is fleeing from some edevil people who want to see him dead. fortunately, he has left a bungee rope on a nearby highway bridge which he can use to escape from his enemies. his plan is to attach one end of the rope to the bridge, the other end of the rope to his body and jump off the bridge. at the moment he reaches the ground, he will cut the rope, jump into his car and be gone. Unfortunately, he had not had eno

1990s/early 2000. It must be changed. When new users open LibreOffice for the first time, they will be drowned in a large number of buttons, icons, and toolbar. Head up Display (HUD) of Ubuntu Unity helps solve this problem, but it does not apply to other desktops and releases. Of course, experienced users know where to find something (or even customize the toolbar to meet special needs), but it is a nightmare for new users or common users. Now is a good time to make changes. Introduce the rema

Android Play onLowMemory () and onTrimMemory () Today, I checked the LitePal framework source code of Guo GE. I just opened the LitePalApplication source code and saw this scene. @Overridepublic void onLowMemory() {super.onLowMemory();mContext = getApplicationContext();} I don't know much about Guo ge. I vaguely remember someone talking about onLowMemory () and onTrimMemory (). So I checked the source code. This blog will pop up onLowMemory () and onTrimMemory () First, you can see through th

is eating, what will happen? The waiter will leave, leaving you hungry and alone. To put it back, even if you happen to know all the content of the menu, you can make sure that the order is successful. But if you go to that restaurant next time, the menu has been changed, your problem list becomes invalid or incomplete. Obviously, the proper way is to call all the waiters and say, "I want something the g

be 0, so the memory address in the error prompt is not set to "0x00000000", but other random numbers. If the system frequently mentions error prompts, the following suggestions may be described: 1. check whether a trojan or virus exists in the system. Such programs tend to change the system irresponsibly to control the system,As a result, the operating system is abnormal. In general, information security awareness should be strengthened, and the executable procedures with unknown sources shoul

understand all this information and use it to make a sound technical decision. As I used to say when I was a DBA, all these seem like a big mystery to me. Combining all these together is a challenge. Who are you? Many DBAs are waiting for their lives at any time. They will receive calls during the day or night to solve their database's fatal problems. Databases are an essential part of the basic organization of commercial information technology. Without data, there is no need to own a compute

service class is instantiated once, which means that instance a is called when setvalue is called, and instance B may be called when getvalue is called. Therefore, the private field value is not saved. How can we prove that the two called operations do not belong to the same service instance? Do you still remember gethashcode? Yes, as long as the instance is not in the same memory, its hash value must be different. If so, let's change the above service code.Public void setvalue (int n) { This.

activities may interrupt the standard development cycle. However, when I look at an independent project, especially a complete project, every time I find that we do nothing in a standard development cycle, one day or several days, I am very worried. I am worried because it means something went wrong. Generally, no one is trying to solve the problem, or the project has no progress because it is stuck in a certain problem. No matter what the problem is, the source code management software will te

once said that raising a question is often more important than solving a problem, because the proposal of a key question often shows that you are aware of the breakthrough to solve the problem. 4. unconventional thinking. Imagine what the ideal state will be, what the extreme conditions will be, what the special crowd will need, the starting point of time and the terminal situation, or infinitely exaggerating and narrowing down and turning it into a lazy, what will

PHP that displays the page?> What's wrong here? First, it is implicitly believed that the get variable PID from the browser is safe. What will happen? Most users are less intelligent and cannot construct semantic attacks. However, if they notice that the PID in the URL field of the browser is 33, the problem may start. If they enter another number, it may be okay; but if they enter something else, such as an SQL command or the name of a file (such as

who has the right to make decisions.9.People have different ways of responding to stress. You must have a keen observation and openness to help the team cope with different pressures. Chapter 2 Why leadership is based on trust 1.Trust is established through effective commitment.2.Trust is lost because of inconsistent actions on important things.3.Use Authorization and trust to allow everyone to do a good job.4.The delegated power comes from the organizational hierarchy, and the obtained power o

. Avoid low VMTmpfs dynamically increases or decreases as needed: If your tmpfs file system increases to the extent that it consumes all the virtual memory, and you do not have any remaining Ram or swap partitions, what will happen at this time? In general, this situation is a little annoying. If it is the 2.4.4 kernel, the kernel will be locked immediately. For the 2.4.6 kernel, the VM subsystem has been corrected in many ways. Although it is not a g