1. Ch2 Data Organization and Data Control
Lee WS

2. Database Management System (DBMS)
What is database?
What is the function of database?

3. Database Management System (DBMS)
A database is a collection of interrelated data files organized in tables of specific formats
Database management system (DBMS) is a computer program
Manage the database structure
Store, organize and retrieve data in a database

4. Database Management System (DBMS)
What are the examples of database management system?

5. Database Management System (DBMS)
Database server:
MySQL. Oracle Enterprise Manager, Microsoft SQL Server
Small office and personal use
Microsoft Access, Microsoft Visual FoxPro, FileMaker Pro…

6. Basic Functions P.55 Organize Tables Manage Records in a Table
Data Entry Forms
Reports

7. Access Homework Complete your Database (p.58-63) More than 10 records
More than 4 fields
Submit to eClass

8. File Access Modes Magnetic tape Sequential Access Mode
Seek time is long and unpredictable when records are retrieved randomly
Not a common medium for storing frequently used data records .

9. File Access Modes Why we still use magnetic tape?
Mainly used for backing up and recovering of database and data files in computer servers

10. File Access Modes Direct Access Mode hard disk optical disk
floppy disk
Secondary storage
high reliability
speed and capacity

11. Hard disk
Platter surface rotates to move the data to the read/write head.
Read/write head moves across platter surface to the right track and waits for arrival of target data

12. (a) Suggest three database management system he can use.

13. (b) He inputs all transactions by using the browser table as shown below.
(i) Suggest one feature of a database management system that provides a better environment for inputting the transactions.
(ii) Suggest three functions provided by the feature in part (b)(i) that can improvve the accuracy of data entry.

14. (c) Why should he back up the database every night?

15. (d) He uses the magnetic tape for the backup process
(d) He uses the magnetic tape for the backup process. Suggest one advantage and one disadvantage of using the magnetic tape for backup purpose.