Bit120 m02 l03 - storing data
- 1. © 2011 Neumont University DATABASESStoring Data for Business & Revenue Model Application
- 2. © 2011 Neumont University What is a database?
- 3. © 2011 Neumont University Stack of Hard Disks
- 4. © 2011 Neumont University Think of a database like this … 4
- 5. © 2011 Neumont University What is a relational database?
- 6. © 2011 Neumont University How does a database work? https://www.youtube.com/watch?v=z5YnKt2aOCs&t=128s
- 7. © 2011 Neumont University What does SQL mean? Structured Query Language • SQL - Structured Query Language – is a special-purpose programming language designed for managing and searching data held in a relational database.
- 8. © 2011 Neumont University What is database software? • Database software is the phrase used to describe any software that is designed for creating databases and managing the information stored in them. » www.webopedia.com • A database program is the heart of a business information system and provides file creation, data entry, update, query and reporting functions. The traditional term for database software is "database management system“ » www.pcmag.com/encyclopedia/term/40883/database-program 8
- 9. © 2011 Neumont University Database Software Vendors 1. Oracle Database 2. Microsoft SQL Server 3. IBM DB2 4. SAP Sybase ASE 5. Postgre SQL 6. MariaDB Enterprise 7. MySQL 8. Teradata 9. Informix 10. Amazon SimpleDB 9 The database market is a huge and growing market. According to IDC, the overall database market tops $40 billion today and should reach $50 billion by 2017.
- 10. © 2011 Neumont University Assembling & Storing Data
- 11. © 2011 Neumont University Databases make Web search possible. Storing and retrieving data is what the Web is all about. GOOGLE DATA CENTERS
- 12. © 2011 Neumont University Database Mapping • Organizing and connecting databases so they can be easily searched to produce useful information. 12
- 13. © 2011 Neumont University Database Administrator 13
- 14. © 2011 Neumont University Data Redundancy • Data stored in different locations is unlikely to be updated consistently • Data redundancy – same data stored unnecessarily in different places • Data inconsistency – different and conflicting versions of same data occur at different places • Data anomalies – abnormalities when all changes in redundant data are not made correctly 14
- 15. © 2011 Neumont University Data Redundancy - Example 15
- 16. © 2011 Neumont University Database Normalization • Database normalization, or simply normalization, is the process of organizing the columns (attributes) and tables (relations) of a relational database to reduce data redundancy and improve data integrity. • Normalization involves arranging attributes in tables based on dependencies between attributes. 16
- 17. © 2011 Neumont University Database Normalization 17
- 18. © 2011 Neumont University In Class • Question & Answer • Case Studies & Examples • Exciting Assignments … 18