What Is Data?

1
What Is Data?
2
What is DATA?

• Machine experience, what a machine makes of its
  environment

Hmmmm. That feels just like 3 or maybe a 4
but definitely not a 5
THREE POINT FIVE
3
What is INFORMATION?

• Human experience of Data telling us something we
  didnt know or werent able to predict.

Hey, Schoey, Jones is here for his stock
Was it Jones or Smith we promised the stock to?
Gotta find out. Should be Smith, but
OK, and thanks for the INFORMATION!
4
The Organizational Data Shadow
Real World
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Events as Data

• Each event generates some data
• The data are about the objects that play roles in
  the event
• The data describe the objects and perhaps how
  they relate to one another
• The events, too, relate to one another in various
  ways.

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Data Events

• Consider a sales event
• It involves a number of objects items sold,
  salesperson, act of selling, customer, money
  (objects are also called entities)
• Each event generates data that describe each of
  the objects.?

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Describing Objects

• Items sold No. of items, item description or
  number
• Salesperson Employee number, commission rate
• Act of selling Time, date, counter
• Customer Name and address or membership number

8
How we experience Data

• In files, folders, documents, dossiers,
  descriptions, and envelopes.
• Computer-stored information is often referred to
  as files, within which there are records, but
  this terminology isnt ubiquitous.

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How to Describe a File

• Files have these characteristics
• Organization how individual records relate to
  each other
• Location where the file can be found
• Storage medium the physical substance the data
  is encoded on
• Access or filing method how the records can be
  retrieved
• Structure (perhaps related to access)

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Views of Data

• Physical View
• As seen by the hardware software
• Logical View
• As seen by the users

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Costs of Data Data Use Model
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Costs of Data Data Use Model





Dispose
Source
GUIs
Subscriptions
Cheaper H/W, Relational Databases
DBMS, non-redundant storage, OODBMS
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