Collecting & Storing Data (Databases)
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Collecting & Storing Data (Databases)

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

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

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Collecting & Storing Data (Databases) Collecting & Storing Data (Databases) Presentation Transcript

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