Cascade Database

If a computer manufacturer, its database holds machine and accessories product information. The table used to save the whole product information is called pc; the table used to save the parts supply information is called parts. There is a field in the pc table, used to describe the type of CPU used in this computer; there is a field in the parts table, the description of the CPU model, we can think of it as a list of all CPU models. Obviously, the CPU used by this manufacturer must be a model that exists in the supply information sheet. At this time, two tables ...

The logical design of database is a very broad problem. In this paper, the main key design of the table is discussed in the design of MS SQL Server, and the corresponding solutions are given. Primary key design status and problems about database table primary key design, in general, based on business requirements, based on business logic, the formation of primary key. For example, when sales to record sales, generally need two tables, one is the summary description of the sales list, records such as sales number, the total amount of a class of cases, and the other table record of each commodity ...

Hive data type 1. Basic type Integer type: Tinyint,smallint,int,bigint, the above types correspond to the Byte,short,int,long in Java respectively. Decimal Type: Float,double Boolean type: Boolean string type: String,varchar,char 2. Complex Type Array,map,struct,timestamp (DATE) Common ...

1. Project background with the rapid popularization of the Internet, the number of Internet access has increased by leaps and bounds. At the same time, there is a growing demand for information on the Internet. Gradually not satisfied with the simple text interface and boring MIDI music, and eager to be able to hear the more cordial to see the sound and image. So the network streaming media technology is born with the development of the network, and integrates the television technology, and becomes the rapid rise of a high-tech comprehensive technology. It took advantage of the network and video technology, and completely changed the passive side of the past watching the show ...

In previous years, with the popularity of the network and the rapid development of network technology, Enterprise Park security system, especially the monitoring system from the traditional local monitoring gradually to the network road, into the digital era. And the current nationwide intelligent city construction carried out in full swing, its coverage of the field in all aspects of urban life, and Wisdom Park is an important manifestation of intelligent city, its architecture and development model is the wisdom of the city in a small area within the epitome. Therefore, the Intelligent Park concept first led the park security building ...

"Guide" the author (Xu Peng) to see Spark source of time is not long, note the original intention is just to not forget later. In the process of reading the source code is a very simple mode of thinking, is to strive to find a major thread through the overall situation. In my opinion, the clue in Spark is that if the data is processed in a distributed computing environment, it is efficient and reliable. After a certain understanding of the internal implementation of spark, of course, I hope to apply it to practical engineering practice, this time will face many new challenges, such as the selection of which as a data warehouse, HB ...

In the current information-based society, more and more unstructured and http://www.aliyun.com/zixun/aggregation/13667.html "> semi-structured data appear, resulting in the amount of data has been the original TB level increased to the PB level." The original single relational database also has a performance bottleneck. To address these challenges you need a solution that meets both high and low cost and high reliability bulk storage requirements while leveraging distributed computing frameworks and databases ...

Internet giants Google and Facebook have achieved huge value by managing and analyzing big data, prompting CIOs to ask whether emerging technologies can create brilliant results within their own businesses. The idea is partly encouraged by industry analysts predicting that big data will grow at breakneck speed. Wikibon predicts that by 2015 the big data market will jump from $5 billion trillion in 2012 to more than $30 billion trillion, up to $53.4 billion in 2017 (where you can ...).

Today, Apache Hadoop is no longer known to anyone. 　　When Doug Cutting, the Yahoo search engineer, developed the Open-source Software Library to create a distributed computing environment and named his son's elephant doll, who would have thought it would one day occupy the top spot of "Big data" technology? While Hadoop is associated with big data, it is believed that many users have little knowledge of it. In last week's Tdwi Solution Summit, TDWI research director and industry analyst Phil ...

The author describes how to use OpenCV and similar tools for digital video analysis and methods to extend such analysis using cluster and distributed system design. In previous installments, a coprocessor designed specifically for video analysis and new OPENVX hardware acceleration was discussed, which can be applied to the computer Vision (CV) sample provided in this article. This new data-centric CV and video analysis technology requires system designers to rethink application software and system design to meet demanding requirements such as large, public facilities and infrastructure, and a more entertaining ...