What Is The Primary Key Field In A Database

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 ...

With the rise of internet web2.0 websites, the relational database has become a very hot new field, the development of the non relational database products is very rapid. 　　But the traditional relational database in dealing with web2.0 website, especially the super large-scale and high concurrent SNS type web2.0 pure dynamic website already appeared to be powerless, has exposed many insurmountable problems, for example: 1, high configured--to the database higher concurrent reads and writes the demand WEB2.0 website to be based on user personalized information to generate real-time dynamic ...

Over the past few years, the world of NoSQL databases has been filled with interesting new projects, ambitious statements and a lot of promises. It is rumored that the latest NoSQL database software package achieves significant performance improvements by adjusting all the structures and the three times-fold checksum that the database creator has been hoping to increase over the years. What about reliability? The reliability is overrated, according to Wall Street programmers who didn't use the NoSQL database to run large-scale enterprise applications but only trivial deals. What about the tabulation structure? Too rigid and limited. e.g.

Storing them is a good choice when you need to work with a lot of data. An incredible discovery or future prediction will not come from unused data. Big data is a complex monster. Writing complex MapReduce programs in the Java programming language takes a lot of time, good resources and expertise, which is what most businesses don't have. 　　This is why building a database with tools such as Hive on Hadoop can be a powerful solution. Peter J Jamack is a ...

The intermediary transaction SEO diagnoses Taobao guest cloud host Technology Hall recently, the international famous source database manufacturer MySQL's China Research Center and the Tianjin Massive information Technology Limited Company signed the strategic agreement, the massive technology will achieve the MySQL biggest degree localization in China, seizes the Chinese open source database market to provide the formidable help. 　　Because MySQL is a very useful open source database software, its own superior speed, scalability and reliability makes it an indispensable database products. Since the MySQL database can be used in Li ...

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 ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host Technology Hall first, let's familiarize ourselves with the object methods that will be used. The data we use to get the last page passed over is typically used by the request object. Similarly, we can use the request object to get the uploaded file data ...

See an article on Access database security again today, every time I see this article want to say two, popular saying there are several: first, the password to the database a random complex name to avoid being guessed to be downloaded, this way in the past very popular, because everyone is very confident of their own code. But as the error prompts the database address to cause the database to be illegally downloaded, this way also less and more people use. This approach, has been rarely used, in addition to the security of the less knowledgeable programmers, although few, but still will encounter, such as a few days ago to see the properties of the site. Two...

As long as you master the following method, you can basically get the mysql database. First, the connection MYSQL format: mysql-h host address-u username-p user password 1, Example 1: Connect to the local MySQL: First open the DOS window and then enter the directory mysqlbin, then type the command mysql -uroot - p, after the carriage return prompts you to lose the password, if you just installed MYSQL, super user root is no password, so enter directly into MYSQL, MYS ...

Designing 1 applications doesn't seem to be difficult, but it's not easy to achieve the optimal performance of the system. There are many choices in development tools, database design, application structure, query design, interface selection, and so on, depending on the specific application requirements and the skills of the development team. This article takes SQL Server as an example, discusses the application performance optimization techniques from the perspective of the background database, and gives some useful suggestions. 1 database design to achieve optimal performance in a good SQL Server scenario, the key is to have 1 ...