Mongodb Group By Field

Hot week: Don't blame open source technology it's innocent. Posted 23 hours ago | Times Read | SOURCE csdn| 0 Reviews | Author Wang Cloud hotspot open source Google Amazon IBM Transistor MongoDB Summary: This week's content: Open source technology is important, please do not give it for security problems, for the load after the 42 "monster" level problem, how should we solve? Google GCE vs. Amazon EC2, who is stronger, and Google and other Internet companies will become innovation centers? Four misunderstandings and four conjectures based on IaaS;

As global corporate and personal data explode, data itself is replacing software and hardware as the next big "oil field" driving the information technology industry and the global economy. Compared with the fault-type information technology revolution such as PC and Web, the biggest difference of large data is that it is a revolution driven by "open source software". From giants such as IBM and Oracle to big data start-ups, the combination of open source software and big data has produced astonishing industrial subversion, and even VMware's past reliance on proprietary software has embraced big Open-source data ...

Since March 20, 2013 Docker appeared in front of developers, less than two years now. "Docker has transformed from a great idea into a great technology, and from a great technology to a great ecosystem, and even from a great ecosystem to a great movement." "I remember at the Docker summit in 2013, developers were still talking about Docker, and at the 2014 Amsterdam Summit, participants were already sharing its case." However, Docker's business ...

On the face of it, looking for the wisdom of big data on Twitter seems like an ironic suggestion. 　　In fact, most ordinary consumers and business users use Twitter as a platform for data generation, and the information provided will be used as a source of analysis rather than as a guide to analyzing the solution. Twitter does, however, carry a huge amount of valuable data expertise--provided we know where to find them. Like other social platforms, Twitter is sometimes as noisy as it has no real value. If you add "large number ...

From April 26 to April 27, 2013, the World Of Tech (WOT) brand of 51CTO Media Group held the 2013 Big Data Global Technology Summit at Renaissance Beijing Capital Hotel. The summit will focus on the big data infrastructure and ecosystem of upper-level applications, discussing solutions to problems caused by large-scale data, exploring solutions to big data-based solutions, and stimulating the competitiveness brought by data mining to make the data sound. The following is the report of this summit: 2013 big data global technology summit topic Lu Danfeng graduated from Peking University, with a master's degree in applied mathematics ...

"IT168" I have always felt that nosql in fact very easy to understand, I have also had a very in-depth study of NoSQL, but in the recent preparation of yuntable chart, found that NoSQL not only very profound, 　　And my personal understanding of NoSQL is only superficial, but I am still a "shame and then Yong" people, so after a period of study, from the sixth part of this series, will talk to you nosql, and this article will be the main to do a NoSQL database review. ...

Taxis, buses, passenger buses, heavy goods vehicles ..., operating vehicles occupy an important position in urban traffic, and people's lives and even social development has an important relationship. 　　It has become an indispensable part of intelligent traffic construction to build an information platform, monitor and manage the operating vehicles, standardize the vehicle behavior and establish a good operation order. "National Transportation Supervision Service Platform" is one of the important products developed by Beijing Zhong Xing Road Information Technology Co., Ltd. (hereinafter referred to as "Zhong Xing Lu"), which is committed to the monitoring, management and information interaction of the national freight vehicle, in full ...

"Editor's note" OpenStack Paris summit just ended, some participants feel is: the manufacturers look at each other, not many users. Also some people are asking: OpenStack in the end rely on not reliable, have got the case of shot? In this article, Unitedstack founder and CEO Chenghui in the Paris summit, the OpenStack Ecological circle of commercial companies in the inventory. Chenghui said: "OpenStack has been too high expectations of the peak, is experiencing a bubble in the bottom of the valley, for startups, this is the hardest time, this is the most ...

From 2008 only 60 people attended the technical salon to the present thousands of people technical feast, as the industry has a very practical value of the professional Exchange platform, has successfully held the seven China large Data technology conference faithfully portrayed a large data field in the technical hot spot, precipitated the industry's actual combat experience, witnessed the development and evolution of the whole large data ecological circle technology. December 12-14th, hosted by the China Computer Society (CCF), CCF large data expert committee, the Institute of Computing Technology of the Chinese Academy of Sciences and CSDN co-organized the 2014 China Large Data Technology conference (Big&n ...

The "Editor's note" Container technology is a lightweight virtualization technology that allows you to virtualize a stand-alone system's operating environment with fine-grained granularity. This means that a physical server, or a virtual server above a cloud, can run hundreds of separate containers at the same time. Based on the distinctive features of "fast" in the gaming industry, every business logic, such as the control of character walking, fighting, scene, chatting, archiving, database, etc., can be run in a separate container. This series of containers constitutes the autonomous system of an independent gaming world. ...