1. File Systems and Databases Chapter 1 The Worlds of Database Systems Prof. Sin-Min Lee Dept. of Computer Science

2. Tuesday Thursday 10:15 – 11:30

3. ??! Your evaluation in this course is determined by: 30% Class Presentation 10% Presentation report 5%

13. Figure 1.1 Sales per Employee for Each of ROBCOR’S Two Divisions

19. File Based Systems Naughty Nice Just what asked for Coal Estimation Delivery List Application File Toys Addresses Toys

23. Database Environment CASE Tools DBMS User Interface Application Programs Repository Database

24. Database Components DBMS =============== Design tools Table Creation Form Creation Query Creation Report Creation Procedural language compiler (4GL) ============= Run time Form processor Query processor Report Writer Language Run time User Interface Applications Application Programs Database Database contains: User’s Data Metadata Indexes Application Metadata

26. PC Databases E.g.: Access FoxPro Dbase Etc.

27. Centralized Databases Central Computer

28. Client Server Databases Network Client Client Client Database Server

29. Distributed Databases computer computer computer Location A Location C Location B Homogeneous Databases

30. Distributed Databases Local Network Database Server Client Client Comm Server Remote Comp. Remote Comp. Heterogeneous Or Federated Databases

36. Figure 1.2 The DBMS Manages the Interaction Between the End User and the Database

44. Figure 1.3 Contents of the CUSTOMER File

47. Table 1.1 Basic File Terminology

48. Figure 1.4 Contents of the AGENT File

49. A Simple File System Figure 1.5