Database Constraints Examples

Introduction with the advent of the cloud computing era, various types of Internet applications are emerging, the relevant data model, distributed architecture, data storage and other database related technical indicators also put forward new requirements. Although the traditional relational database has occupied the unshakable position in the data storage, but because of its inherent limitation, has been unable to satisfy the cloud computing age to the data expansion, reads and writes the speed, the support capacity as well as the construction and the operation cost request. The era of cloud computing has put forward a new demand for database technology, which is mainly manifested in the following aspects. Mass data processing: to ...

A good database product is not equal to have a good application system, if can not design a reasonable database model, not only will increase the client and Server section program programming and maintenance of the difficulty, and will affect the actual performance of the system. Generally speaking, in an MIS system analysis, design, test and trial run stage, because the data quantity is small, designers and testers often only notice the realization of the function, but it is difficult to notice the weak performance, until the system put into actual operation for some time, only to find that the performance of the system is decreasing, At this point to consider improving the performance of the system will cost more ...

(Author Srini penchikala translator Dingxuefeng) for non-relational data types such as documents, object graphs, and key-value pairs, the NoSQL database provides them with an alternative way to store data. Can distributed caching be used as a NoSQL database? Ehcache's Greg Luck author describes the similarity between distributed caching and NoSQL databases. Infoq interviewed him and discussed the pros and cons of the scheme. InfoQ: Can you do a distributed caching solution with the NoSQL database ...

We have all heard the following predictions: By 2020, the amount of data stored electronically in the world will reach 35ZB, which is 40 times times the world's reserves in 2009. At the end of 2010, according to IDC, global data volumes have reached 1.2 million PB, or 1.2ZB. If you burn the data on a DVD, you can stack the DVDs from the Earth to the moon and back (about 240,000 miles one way). For those who are apt to worry about the sky, such a large number may be unknown, indicating the coming of the end of the world. To ...

This series of articles is a learning record about the fundamentals of azure services development, and because of time constraints, the process of wishing to discuss and explore yourself is from scratch, to be able to develop basic programming for azure services. There may be a very deep topic relative to each topic, and I would like to have time to do it through other articles. 　　The positioning of this series is basically positioning, take 20-30 minutes, download the code first, follow the article, run to get the relevant experience. The previous article is about Azure queue storage, this is about ...

Since Amason launched SimpleDB, distributed data storage systems based on Key-value key values have received widespread attention, similar systems include Apache COUCHDB, and the recent blockbuster Google App Engine based on the BigTable Datastore API, there is no doubt that the distributed data storage system provides better lateral scalability, is the future direction of development. But at this stage, compared with the traditional RDBMS, there are some gaps and deficiencies. Ryan P ...

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This article comes from knowing "what is the basis for pricing virtual products for app". 　　Economist Varian's definition: "All digital products or can be digitized products, can be regarded as information products", traditional information products in books, movies as the representative, now talk more of course is software, APP, website category. First, the cost of information products to talk about pricing must talk about cost, information product cost is characterized by: high fixed cost of production (such as the development of Windows 8 cost of capital and human input), but increase the copy ...

Absrtact: This article comes from knowing what is the basis for pricing virtual products for app. 　　Economist Varian Definition: All digital products or can be digitized products, can be regarded as information products, traditional information products in books, movies as a representative, now talk about this article from the "for the app for a class of virtual products on the basis of pricing." Economist Varian Definition: "All digital products or can be digitized products, can be regarded as information products", traditional information products in books, movies as a representative, now talk about ...

Absrtact: This article comes from knowing what is the basis for pricing virtual products for app. 　　Economist Varian Definition: All digital products or can be digitized products, can be regarded as information products, traditional information products in books, movies as a representative, now talk about this article from the "for the app for a class of virtual products on the basis of pricing." Economist Varian Definition: "All digital products or can be digitized products, can be regarded as information products", traditional information products in books, movies as a representative, now talk about ...