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…

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……

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…

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…

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…

Dev401-017:Data Management: Introduction to Upsert Module Objectives1.Define upsert.2.Define external ID.3.List typical use case where upsert is useful.4.List typical use case where upsert with relationships is useful.5.Explain how external IDs are u…

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,…

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…

http://en.wikipedia.org/wiki/Intel_Active_Management_Technology Intel Active Management Technology From Wikipedia, the free encyclopedia     Intel AMT web page available even when the computer is sleeping. Intel Active Management Technology (AMT) is…

Data Management ObjectivesBy the end o this module, you should understand the fundamentals of data management, including:1.Explain typical data management operations.2.Describe typical user cases for inserting system fields.3.List the ways to obtain…

场景3 Data Management 数据管理 性能优化 OLTP OLAP 物化视图 :表的快照 传输表空间 :异构平台的数据迁移 星型转换 :事实表 OLTP : 在线事务处理 1. transaction —> DML 2. 数据量小 3. 处理时间短 —> SQL 共享,绑定变量 4. 并发量大 OLAP,DSS 1. 以查询为主(海量)—> 数据汇总 —> 结果放到表(物化视图)里 2. 处理时间长 3. 几乎无并发 4. 做并行处理 SGA + PGA memory_…

ev401-018:Data Management: Data management ToolsModule Objectives1.List objects exposed in the import wizards.2.List some objects not exposed in the import wizards.3.List some capabilities of API-based tools that the import wizards do not have.4.Stat…

Dev401-016:Data Management: Data management Overview Course Objectives1.List typical data management operations.2.Define upsert and external ID.3.List typical use cases where upsert is useful.4.List some tools available to perform data management ope…

二. 控制流 statement:一个单独的R语句或者是一个复合的R语句: cond:条件表达式,为TRUE或FALSE: expr:数字或字符表达式: seq:数字或字符串的顺序. 1.循环语句:for,while (1)for(var in seq)  statement for(i in 1:10) + print("Hello R") [1] "Hello R" [1] "Hello R" [1] "Hello R"…

一. R的数学函数,统计函数及字符处理函数 例01:一道实际应用题 一组学生其数学,科学和英语的成绩如下表: 任务:根据成绩,决定对每个学生的单独指导: 前20%的学生的成绩为A,次之为B,以此类推: 把学生姓名按照字母表顺序排序. 问题:三科考试的分数不具可比性:必须把考试分数转化为可以比较的记分单元,然后才能进行分数间的比较. 为分配A,B等级,需把学生成绩转换为百分比形式. 姓名有单独的域,使得分配学生的任务变得更难:故应该把名字分为名和姓. 1. 数字和字符函数(Numerical(ma…

1. 创建新的变量 variable<-expression expression:包含一组大量的操作符和函数.常用的算术操作符如下表: 例1:根据已知变量,创建新变量的三种途径 > mydata<-data.frame(x1=c(2,2,6,4),x2=c(3,4,2,8)) > mydata$sumx<-mydata$x1+mydata$x2 > mydata$meanx<-(mydata$x1+mydata$x2)/2 >> attach(myd…

数据管理工具 1.LAS数据集 # Process: LAS 数据集统计数据 arcpy.LasDatasetStatistics_management("", "SKIP_EXISTING_STATS", 输出统计数据报告文本文件, "DATASET", "COMMA", "DECIMAL_POINT") # Process: 从 LAS 数据集中移除文件 arcpy.RemoveFilesFromLas…

(数据管理工具)<二> 点击跳转(数据管理工具)<一> 16.打包 # Process: 共享包 arcpy.SharePackage_management("", "<未登录 ArcGIS.com.>", "*****", "", "", "", "MYGROUPS", "") # Process: 创建地图切…

Introduction to data management 整个coures 2 是讲data management and storage 的,主要内容就是分布式文件系统,HDFS, Redis 等 What is data management? Introduction to data model 什么是data model? 三个component - Structure, Operations, Constrants 四个基本 data operation - selection(…

As we now know, many prominent internet companies, most notably Google, Amazon, Yahoo!, and Facebook, were on the forefront of this explosion of data. Some generated their own data, and others collected what was freely available; but managing these v…

ABSTRACT Recent technological advancement have led to a deluge of data from distinctive domains (e.g., health care and scientific sensors, user-generated data, Internet and financial companies, and supply chain systems) over the past two decades. The…

CS100.1x简介 这门课主要讲数据科学,也就是data science以及怎么用Apache Spark去分析大数据. Course Software Setup 这门课主要介绍如何编写和调试PySpark.本节主要介绍环境搭配.为了让所有人环境一致,本课程的编程环境是用Virtual Machine.你需要安装VirtualBox和Vagrant来搭环境. 硬件和软件要求 这门课需要的最小硬件配置如下: 硬盘空间: 3.5 GB 内存: 2.5 GB (4+ GB 更好) 处理器: 任何I…

简介 Spring.NET为事务管理提供了一个持久化抽象(consistent abstraction ),其优点如下: 为不同事务API,例如ADO.NET,Enterprise Services,System.Transactions和NHibernate,提供了一个持久化编程模型. 为以上数据获取技术的声明式事务管理(declarative transaction management) 提供支持. 为可编程事务管理(programmatic transaction management)…

week4 streaming data format 下面讲 data lakes schema-on-read: 从数据源读取raw data 直接放到 data lake 里,然后再读到model里 schema-on-write: 传统模式,把raw data 经过处理后放到data warehouse里,此时已经是结构化的数据,然后直接load 出来 data lake summary week5 - big data management 针对大数据,传统DBMS 需要提高的地方 s…

zhuan :https://www.linkedin.com/pulse/100-open-source-big-data-architecture-papers-anil-madan Big Data technology has been extremely disruptive with open source playing a dominant role in shaping its evolution. While on one hand it has been disruptiv…

原文链接:http://docs.spring.io/spring/docs/current/spring-framework-reference/html/transaction.html 12. Transaction Management 12.1 Introduction to Spring Framework transaction management Comprehensive transaction support is among the most compelling rea…

https://www.gartner.com/doc/reprints?id=1-4LC8PAW&ct=171130&st=sb Summary Security and risk management leaders are implementing and expanding SIEM to improve early targeted attack detection and response. Advanced users seek SIEM with advanced prof…

Data lake - Wikipedia https://en.wikipedia.org/wiki/Data_lake 数据湖 Azure Data Lake Storage Gen2 预览版简介 | Microsoft Docs https://docs.microsoft.com/zh-cn/azure/storage/data-lake-storage/introduction Azure Data Lake Storage Gen2 是适用于大数据分析的可高度缩放.具有成本效益的 D…

文章标题 One SQL to Rule Them All – an Efficient and Syntactically Idiomatic Approach to Management of Streams and Tables 用SQL统一所有:一种有效的.语法惯用的流和表管理方法 syntactically 句法上;语法上;句法;句法性地;句法特征 idiomatic [ˌɪdiəˈmætɪk] 惯用的;合乎语言习惯的;习语的 approach [əˈproʊtʃ] v.(在距离或时间…

Microsoft Dynamics 365 will be released on November 1. In preparation for that, Scott Guthrie hosted a virtual event that provided partners and customers with a first look at our new cloud service with purpose-built apps that address specific busines…