Create Unique Index Oracle

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 ...

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In 2017, the double eleven refreshed the record again. The transaction created a peak of 325,000 pens/second and a peak payment of 256,000 pens/second. Such transactions and payment records will form a real-time order feed data stream, which will be imported into the active service system of the data operation platform.

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Editor's note: Jay Kreps, a chief engineer from LinkedIn, says that logs exist almost at the time of the computer's creation, and there is a wide range of uses in addition to distributed computing or abstract distributed computing models. In this paper, he describes the principles of the log and the use of the log as a separate service to achieve data integration, real-time data processing and distributed system design. Article content is very dry, worth learning. Here's the original: I joined the LinkedIn company at an exciting time six years ago. From that time ...

Editor's note: Jay Kreps, a chief engineer from LinkedIn, says that logs exist almost at the time of the computer's creation, and there is a wide range of uses in addition to distributed computing or abstract distributed computing models. In this paper, he describes the principles of the log and the use of the log as a separate service to achieve data integration, real-time data processing and distributed system design. Article content is very dry, worth learning. Here's the original: I joined the LinkedIn company at an exciting time six years ago. From that time ...

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Hall May 10, after three years, I was fortunate enough to participate in the ninth session of China Internet Entrepreneur Conference jointly organized by sing and Tencent. In the past few years of development, the Chinese Internet has undergone unprecedented changes, and the General Assembly from the "Webmaster Conference" transition to the "entrepreneur Conference", the focus of attention also from the traditional internet to mobile interconnection. This change causes us to think, not only the name and direction of change, but also our future Chinese internet people and even the entire human in the information explosion and mobile interconnection ...

Guide: Yahoo CTO raymie Stata is a key figure in leading a massive data analysis engine. IBM and Hadoop are focusing more on massive amounts of data, and massive amounts of data are subtly altering businesses and IT departments. An increasing number of large enterprise datasets and all the technologies needed to create them, including storage, networking, analytics, archiving, and retrieval, are considered massive data. This vast amount of information directly drives the development of storage, servers, and security. It also brings a series of problems to the IT department that must be addressed. Information...

Ultimately, the ability to tap the hidden value of input and behavioral data can be the most critical capability for any SaaS provider to gain market success. This is an absolutely impressive number, as sales and marketing costs are often the biggest cost items in the business world. This article is written by Gordon Ritter. Gordon Ritter is one of the founders of Emergence Capital, a company devoted to investing in cloud, and a partner of the firm. In the era of cloud computing, he argues, professional firms focusing on vertical services will be in for a ...

See the way to open the "TERA", with "science fiction" equipped with armed eyes, the most cool way to experience the first sexy games in Korea. Today, the Kunlun game officially announced, with the world-renowned entertainment empire Sony reached cooperation to jointly create the "TERA" National Service Audio-visual feast. Players will be able to use Sony's latest generation of "personalized" version of the hmz-t3w-style head of the display experience "TERA", feel the rush to match the IMAX visual effects of subversion-level audio-visual shock experience. Figure Sony's latest generation of head wear monitor hmz-t3w ...