Ch2 Data Organization and Data Control

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Presentation transcript:

Ch2 Data Organization and Data Control Lee WS

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

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

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

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…

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

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

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 .

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

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

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

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

(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.

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

(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.