The document discusses key concepts related to database management including:
1. It defines databases as collections of organized data that can be accessed, retrieved, and used via database management software.
2. Databases contain fields, records, files, and data types which are the basic units that make up a database.
3. Maintaining accurate and up-to-date data is important, and database management systems help ensure data integrity through validation, adding/editing/deleting records, and reducing redundancy.
4. Database systems improve upon file processing systems by allowing many users and programs to securely share centralized data.
2. The Learning Outcomes Understand what are DATABASES Identify the components of a database Explain why data is importantto an organization Understand file maintenance techniques File processing System VS Database System
14. Data & Information What is Data Integrity? Degree of which data is correct Garbage in, Garbage out (GIGO) - cannot create correct information from incorrect data
15. Data & Information What are the qualities of Valuable Information? 6 Qualities: Accurate Verifiable Timely Organized Meaningful Cost Effective + 1: Accessible
41. File Processing System Each department has it’s own set of files Records in one file may not relate to records in another file e.g. HR dept & other depts Possible weaknesses: Data redundancy: Same fields / records stored in different files Isolated data: Data stored in different files therefore difficult to access
42. DatabaseProcessing System Many programs and users can share data in database Secures data so only authorized users can access certain data Strengths: Reduced data redundancy Improved data integrity Shared data Faster / Centralized Access Reduced development time
43. “Assists organizations / ‘people’ in creating and managing databases” Database ManagementSystems (DBMS)
44. “Data Dictionary - Contains data about each file in database and each field within those files” Database ManagementSystems (DBMS)
45. “Report Generator - Allows user to design a report on screen, retrieve data into report design, then display or print reports” Database ManagementSystems (DBMS)