Set Query

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 ...

The core concept of sub-library table is based on MySQL storage. Solving the problem of data storage and access capacity, the product supports the database traffic of previous Tmall double eleven singles day core transaction links, and gradually grew into the standard of Alibaba Group access relational database.

The intermediary transaction SEO diagnose Taobao guest Cloud host Technology Hall This is the new year after the first post, say really, I also do not know which aspect of the article to write, and then think about it, as a common Webmaster query tool site to share out, give you a brief introduction. 　　In fact, these sites are familiar to everyone, but everyone's understanding of these sites and views have certain differences. Webmaster Helper Webmaster Helper, as a professional webmaster inquiries site, the development of webmaster and internet staff commonly used some query tools, such as the website ...

&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp;1.find MongoDB uses Find to query. The query is to return a subset of the files in the set. The child collection ranges from 0 documents to the entire collection. The first parameter of find determines which documents to return. The form is also a document that describes the details to be queried. The empty query document {} matches the entire contents of the collection. If you don't specify ...

November 30, 2010, global leader in the world of Internet content security software and services, trend technology announced that in order to make Chinese customers better and faster cloud security protection, trend technology in Nanjing set up a special service for Chinese customers Web reputation query server. After testing, located in Nanjing, the new Web Reputation query server application, Web reputation query speed compared to the previous maximum can speed up more than 50 times times! Trend Technology says that in November 2010, by applying Global load Balancing Technology (GSLB), all of China's ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall Webmaster Platform announced today, search keyword query tool upgrade version of the Open, 　　The main features of the upgraded version of the tool are: 1, the number of hot keywords to expand to 500, will be based on the number of display of the key words sorted. 2, add custom keyword query function, can set 50 ...

Intermediary trading http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology lobby to do site SEO, the importance of the chain of the site beyond doubt." 　　It is because the chain of the site's SEO impact is very large, so Baidu Webmaster platform the latest announced by the Green Luo algorithm, will increase the illegal chain to deal with the crackdown. Formerly in the industry most commonly used is the Yahoo outside the chain inquiry tool, can inquire a website specific ...

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Lobby site query analysis needs to step improve webmaster efficiency according to CNNIC released data, as of December 2010, the number of our website for 1.91 million, and the number of personal webmaster million. Although compared to the previous two years Web site, such as the quality of the basic resources of the Internet with the "water" overflow has been promoted, personal webmaster Site Holdings have declined, but some webmaster hands the number of sites still reach more than two or even more. In the experience of large-scale Internet special rectification, domain name real names ...

This article mainly introduces the MySQL slow query analysis method, some time ago, I have set a record in the MySQL database to query SQL statements slower than 1 second. Think of a few very set method, there are several parameters of the name of life and death memories can not afford, so re-sort it yourself as a note. For troubleshooting bottlenecks to find out the performance, the most easy to find and solve the problem is MySQL slow query and did not have to use the index query. OK, began to find out MySQL implementation is not "cool" SQL statement. ...

QOF (Query Object framework) &http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; is a query-like framework, Provides a set of C-language utilities for performing a complex query of data that is held by a set of C++/c++ objects. The framework is unique, it does not require SQL or any database execution queries, programmers do not need to hook up to a SQL database query ...