Topic 01 : Database Fundamentals

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Topic 01 : Database Fundamentals

  1. 1. Er. Pradip Kharbuja Topic 01 : Database Fundamentals
  2. 2. Student Activity -Brainstorm What databases have you interacted with? •Take a few minutes to think about this and write down your answers
  3. 3. Examples of Use Supermarket checkout Purchasing using a credit card Booking a holiday Taking out insurance Obtaining a passport or other official document Using the Internet, Gmail, Yahoo, Facebook, Twitter, etc
  4. 4. The Importance of Databases Relatively new technology –beginning properly in 1970s One of the most important components of Information Technology Databases are everywhere
  5. 5. What is a database? “A database is a computerised record keeping system.” Date, C.J. (2003). An Introduction to Database Systems 8thEdition. Pearson Education This definition is ok as a starting point. Because some people may include manual filing systems as being a type of database
  6. 6. Record Keeping System Files on a computer Word document Excel Spreadsheet Files on a USB stick Are these all databases? The answer is "NO".
  7. 7. Database Functions Databases should be able to: Store Manipulate Retrieve
  8. 8. Database Size Databases range in size: Single user databases on a PC Small office database with everyone doing the same sorts of tasks Medium size database system with core data but people doing different tasks Corporate databases spread over many sites Very large databases and data-warehouses The Wal-Mart data warehouse was (as of 2004) about 500 tera- bytes in size
  9. 9. But databases aren’t like buckets!
  10. 10. More Detailed Definition “We define a database as an organised collection of logically related data”. Hoffer,J., Ramesh, V. and Toppi, H. (2010). Modern Database Management, 10thEdition.Pearson Prentice Hall.
  11. 11. What does this mean? 1.Organised 2.Logically related 3.Data
  12. 12. Organised Data is structured so that it can be easily stored, manipulated and retrieved by users. It is no good just having some data if we don’t know how to get it in order to use it.
  13. 13. Related Pieces of data do not exist in isolation For example: In a salesperson’s database, the customer’s name and the customer’s address to be stored together They are related.
  14. 14. Data Data are any raw facts, numbers, or text that can be processed by a computer. Data can be found in different formats : 1.operational or transactional data such as, sales, cost, inventory, payroll, and accounting 2.nonoperational data such as forecast data 3.meta data -data about the data itself, such as logical database design or data dictionary definitions
  15. 15. Types of Data 1.Traditional a.Text such as names, address etc. b.Numbers such as age, roll number, number of friends, etc. c.Dates such as a date of birth, college enrolled date, exam date, etc. 2.Multi-media a.Images b.Sounds c.Video
  16. 16. Data and Information There is a little distinction between ‘data’ and ‘information’ Data are ‘raw facts’. Bagum, Ammena 01.02.81 97327627 Ako, Sarah 08.08.81 98737373 Finkle, Clive 09.09.81 93838383 McFarren, Debra 01.01.80 98383837 Sinseros, Douglas 27.05.80 99344222
  17. 17. Information Information is data that has been processed in such a way that it can increase the knowledge of the person who uses it. Student Name Date of Birth StudentID Bagum, Ammena 01.02.81 97327627 Ako, Sarah 08.08.81 98737373 Finkle, Clive 09.09.81 93838383 Mc Farren, Debra 01.01.80 98383837 Sinseros, Douglas 27.05.80 99344222
  18. 18. Information is Important Economically Politically Personally Databases are the key to information.
  19. 19. ANY QUESTIONS ??? Topic 1 : Database Fundamentals

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