Query Profile

It is well known that query optimization is an unavoidable topic in any database. For database engineers, optimization is the most challenging job. MySQL Open source database is no exception. In fact, the author believes that the database optimization is not as much as we imagine the suffering. 　　Under normal circumstances, you can start from the following four details to do a good job in the MySQL database query optimization. First, use the Explain keyword to evaluate the flaw in the query statement as shown in the following figure, now the author in the database to execute a simple select ...

In the development of friends especially and MySQL have contact friends will encounter sometimes MySQL query is very slow, of course, I refer to the large amount of data millions level, not dozens of, the following we take a look at the resolution of the query slow way. -Often find developers looking up statements that are not indexed or limit n, which can have a significant impact on the database, such as a large table of tens of millions of records to scan all, or do filesort, and the database and server IO impact. This is the case above the mirrored library. And ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest Cloud host Technology Hall We all know that the site's inverse link number, determines the site link popularity- -Of course, the quality of the inverse link is just as important--which ultimately affects the site's ranking in search engines. Therefore, in the site optimization process, at any time to grasp what sites, how many sites set up to point to me ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host Technology Hall, this post is with Mr. Mouchangqing on the new micro of a point of view caused. 　　Without prejudice, disagreement and personal attack! The thing is this: Xu Xian in the new micro said: "To do a low-key station, stuffy sound to make a lot of money." Siang born back: "Low-key do the site to make money, most of them are bad websites, or see not light ...

Absrtact: Recently, Mobile in the Barcelona Communications Show (MWC) High-profile launch of fusion Communications (new voice, new news, new contacts). Industry interpretation and analysis of a lot of mixed. Some people think that the fusion of communications to the life of text messages, some people think it is mobile against Tencent recently, mobile in the Barcelona Communication Show (MWC) High-profile launch of fusion Communications (new voice, new news, new contacts). Industry interpretation and analysis of a lot of mixed. Some people think that the fusion of communications to the life of text messages, some people think it is mobile to deal with Tencent Micro-letter products, there are ...

(reporter Wang Yang) talked about SAP and Oracle, and other incompatible enemies, but also the dual identity of friends (the industry appears to be more hostile identity) to become the industry's highly concerned about a pair of children. And this pair of friends for many years old enemy recently again. As the world's top ranked first ERP software manufacturers and the world's largest database software companies, the two powerful collision is bound to spark Splash, and due to the partner face under the both sides of a smile but actually dark war. A long time ago, SAP launched the largest event in the history of the IT industry climax ...

One, what is the demand to meet 1.1 what is the need to meet users to search for "octopus Paul", in terms of textual relevance, search engines simply return to the "Octopus Paul" content related to the results can be, so the user is satisfied? User A: I heard that Octopus Emperor Hung, to see the latest results, how all is August, back page ... User B: Today colleagues are talking about the octopus brother Hung, what is the octopus brother? I again out, to search the Octopus Emperor's life story is what, how all is the latest results, no Octopus brother Introduction Ah, transform a query to see users ...

Requirements Satisfaction Overview One, what is the demand to meet 1.1 what is the demand to meet the user to search "octopus Paul", in terms of textual relevance, search engines just return and "octopus Paul" content related to the results can be, so the user is satisfied? User A: I heard the octopus hung up to see the latest results, How is it all August, back page ... User B: Today colleagues are talking about the octopus brother Hung, what is the Octopus brother? I am out again, to search the Octopus Emperor's life story is what, how all the latest ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall in the consideration of a website if the host million or tens of millions of PV, We tend to think in two directions instinctively: static and distributed. Of course, for Sina and other portal types of Web sites, static + read and write separation and distribution, can solve most of the problems. But we are facing more, may be large data + high and ...

In the past, we have introduced some principles of software development, such as the 10 commandments of high quality code and the UNIX design principles described in the UNIX legend (next article). I believe that you can learn from middle school some knowledge of design principles, as I said in the "How Do I Recruit procedures", a good programmer usually consists of its operational skills, knowledge level, experience level and ability four aspects. Here I would like to talk about some of the principles of design, I think these things belong to the long-term experience summed up knowledge. These principles should be understood by every programmer. But...