Database System -the first theory class 20/03/02

新学期好，在家穿着睡衣艰难起床，开始学习的快乐旅行

第一节课是dsc老师的数据库，双语教学，睡眠因子蠢蠢欲动，难起来了呀

第一节惯例，老师的自我介绍（极为简短//姓名&联系方式&办公室地址）正文开始

课程成绩评判标准： 作业60%（期末5+期中1）+实验课24%（5个小实验&一个大实验）+报告8%+考勤8%

先举了一个例子，商店购物所涉及到的数据库balaba（虽然我觉第一个笑话一点也 不 好笑/所以这里就不说了）

例子讲完之后开始课程概览，这就很公开透明，很喜欢

一共有九章，第四章开始讲SQL语言，即动手实验课(个人理解，狗头逃命

双语教学， Database Archirecture 数据库结构

• what is a database ?
  A very large ,integrated collection of data.
  关键词： structured , interrelated , integrated
  models real-world (enterprises or organizations)
  Entites & Relationships
• what is a Database Management System(DBMS) ?
  A software package designed to store and manage databases.
  Function: manages large amount of data
  supports efficient access
  supports concurrent access
  supports secure , atomic access
• people working with DBMS
  end users / database designers / database application developers / database adminstrators(DBA) / DBMS implementors
  DBA’s duties: schema definition
  strorage structure and access mehod definition
  schema and physical organization modification
  granting user authority to access the database
  specifying integrity constraints
  monitoring performance and responding to change in requirements
• Data Models:Data structures & relationships & contraints
  Entity-Relation data model / Relational model / XML
• View of Data
  ( Schemas :the logical structure of the database
  & Instances : the actual content of the database at a particular time
  （内心os，学不下去了呀…………未完待续，下节课之前更新完毕，我保证……
• Data Definition Language(DDL)
• Data Manipulation Language(DML)
• Database Design
  Logical Desgin (business decision & computer science decision) / Physical Design
• Database System Architecture Centralized
• Application Architecture ( 2 or 3 )
• Database System Structure
• Storage Management : Interaction with the file manager / Efficient strong , retriving and updating of data
• Query Processing
• Transaction Management

最后讲了下数据库的发展历史&里程碑，在这里就水过去了（企图蒙混过关