Collecting & Storing Data (Databases)


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Lesson 4 - Collecting and storing data. Methods and application Year 9 (14/15yo) Presentation plus activity.

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Collecting & Storing Data (Databases)

  1. 1. Collecting & Storing Data (Databases) 9ISTT4L4
  2. 2. Creating a Database <ul><li>Step One – get your data – which is called collecting in DBMS. </li></ul><ul><li>Can be collected from a wide range of sources – people, books, magazines, the internet or observation. </li></ul><ul><li>You need to know what data is needed before deciding how to collect it </li></ul>
  3. 3. Primary Storage <ul><li>Facts (data) that come directly from the data source. </li></ul><ul><li>An interview is a primary source </li></ul><ul><li>Gets information directly </li></ul><ul><li>Secondary source data (facts) come in-directly </li></ul><ul><li>Facts you get from the TV – another person got the facts and you got the facts from them. </li></ul>
  4. 4. Storage <ul><li>Databases are stored electornically </li></ul><ul><li>Size needs depend on the size of the organisation or person </li></ul><ul><li>Large databases need hard drives </li></ul><ul><li>Makes them easy to access via a network </li></ul><ul><li>Allows random access to data </li></ul><ul><li>Allows you to back up data </li></ul>
  5. 5. Back-Up <ul><li>Data is valuable </li></ul><ul><li>Data needs to be protected from theft, loss or corruption </li></ul><ul><li>Theft – someone takes it </li></ul><ul><li>Loss – you can’t find it! Ahhhh </li></ul><ul><li>Corruption – the stuff in there is no longer accurate in some way. </li></ul>
  6. 6. Back-Up <ul><li>You need to back-up your database </li></ul><ul><li>Make a copy, an exact duplicate and store it somewhere safe </li></ul><ul><li>Back up to DVD, CD, Tape, Flash, Internet Site or Secondary Hard Drive. </li></ul><ul><li>Schedule this – do it daily, weekly, monthly </li></ul>
  7. 7. Database is dead! <ul><li>A dead database can only be ‘fixed’ if you can restore it </li></ul><ul><li>Restoring a database means using a back up file </li></ul><ul><li>You can also roll back a database to a point in time. </li></ul><ul><li>If you don’t back up then you cannot restore! </li></ul>
  8. 8. Data is supposed to be accurate <ul><li>Click Here for a a database sample </li></ul><ul><li>Validation of data is key </li></ul><ul><li>When collecting data, it is important to ensure what you get is </li></ul><ul><li>Valid data is the only data you want </li></ul><ul><li>If you validate it as it goes in , then you lower the chances of getting junk data </li></ul>
  9. 9. Identify the VALIDATION that is being asked for on this form. This form is the PRIMARY DATA COLLECTION point for a database The application uses this data to process your personal activity.
  10. 10. Define the following terms and identify them on this diagram (sketch-up)
  11. 11. Text FIELD Memo FIELD Procces Button Cancel Button Reset Button Drop Down List Radio Button Manditory FIELD
  12. 12. Homework <ul><li>Design a DATABASE Collection form that STUDENTS can use on the school intranet. </li></ul><ul><li>To do this you need to find a primary source to find out what are common problems students experience </li></ul><ul><li>JUST CHOOSE ONE SINGLE PROBLEM to solve </li></ul>
  13. 13. Homework <ul><li>What facts to the IT people need to know? </li></ul><ul><li>What facts (if missing) would stop them solving it? </li></ul><ul><li>What facts do the students want to give you? </li></ul><ul><li>USE only WEB BASED input FIELDs? </li></ul><ul><li>Consider VALIDATION. </li></ul>