Data Management Technology(3) -- SQL

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Data Management Technology(3) -- SQL

SQL is a very-high-level language, in which the programmer is able to avoid specifying a lot of data-manipulation details that would be necessary in languages like C++. What makes SQL viable is that its queries are “optimized” quite well, yielding ef…

Data Management Technology(1) -- Introduction

1.Database concepts (1)Data & Information Information Is any kind of event that affects the state of a dynamic system Is the message (utterance or expression) being conveyed Is an ordered sequence of symbols that can be interpreted as a message As se…

Data Management Technology(2) -- Data Model

1.Data Model Model Is the abstraction of real world Reveal the essence of objects, help people to locate and resolve problems Data Model A data model explicitly determines the structure of data, and defines the operation that can be imposed, in order…

Data Management Technology(5) -- Recovery

Recovery Types of Failures Wrong data entry Prevent by having constraints in the database Fix with data cleaning Disk crashes Prevent by using redundancy (RAID, archive) Fix by using archives Fire, theft, bankruptcy… Buy insurance, change profession……

Data Management Technology(4) -- 关系数据库理论

规范化问题的提出在规范化理论出现以前,层次和网状数据库的设计只是遵循其模型本身固有的原则,而无具体的理论依据可言,因而带有盲目性,可能在以后的运行和使用中发生许多预想不到的问题. 在关系数据库系统中,关系模型包括一组关系模式,各个关系不是完全孤立的,数据库的设计较层次和网状模型更为重要. 如何设计一个适合的关系数据库系统,关键是关系数据库模式的设计,一个好的关系数据库模式应该包括多少关系模式,而每一个关系模式又应该包括哪些属性,又如何将这些相互关联的关系模式组建一个适合的关系模型,这些工作决定…

MySQL vs. MongoDB: Choosing a Data Management Solution

原文地址:http://www.javacodegeeks.com/2015/07/mysql-vs-mongodb.html 1. Introduction It would be fair to say that as IT professionals we are living in the golden age of data management era. As our software systems become more complex and more distributed,…

[Windows Azure] Data Management and Business Analytics

http://www.windowsazure.com/en-us/develop/net/fundamentals/cloud-storage/ Managing and analyzing data in the cloud is just as important as it is anywhere else. To let you do this, Windows Azure provides a range of technologies for working with relati…