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Databases The Fundamentals
Understanding Information ,[object Object],[object Object]
Data & Information ,[object Object],[object Object],[object Object],[object Object],Information is data converted into meaningful and useful context
Purpose of a Database ,[object Object],An Excel Spreadsheet is useful for keeping track of things as well: But not of things that require more than one theme
Example DB with more than 1 theme A DB however can manage multiple Theme
What is a DB? ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
Figure 4-3 Student Table (also called File)
Information Granularity ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
High Quality Information Accuracy Are all values correct?  Is name spelt correctly or $ amount right. Completeness Are any values missing?  Does address include state and zip code? Consistency Is aggregate or summary information in agreement with detailed information?  Example, do all total fields equal the true total of individual fields? Uniqueness Is each transaction, entity, and event represented only once in the information? Are their duplicate customers? Timeliness Is information current with respect to the business requirements? Is data updated weekly, daily, or hourly?
Quality information for Decision-Making ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
How do our systems collect poor data? ,[object Object],[object Object],[object Object],[object Object]
Database Fundamentals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DBMS ,[object Object],[object Object]
Database Advantages Increased Flexibility Needs to be able to handle changes quickly; It also needs to be able to allow users to use information in the many different ways  they may need to  Increased Scalability & Performance Manages large masses of information and large numbers of users in ways non-technical solutions could not! Reduced Redundancy Keeps organizations from storing the same information in multiple places Increased Integrity Is a measure of the quality of information. Integrity constraints are rules that help ensure the quality of information Increased Security Managed with passwords and levels of authorizations
Data Warehouses & Data Marts ,[object Object],[object Object],[object Object],[object Object]
Data Warehouses ,[object Object],[object Object]
Model of a typical Data Warehouse
ETL ,[object Object],[object Object]
Data Marts ,[object Object],[object Object],[object Object],[object Object],[object Object]
Business Intelligence ,[object Object],[object Object],[object Object],[object Object],[object Object]
Gaining sustainable competitive advantage with BI ,[object Object],[object Object],Technology Technology enables even the smallest of companies to compute and monitor business metrics People “ business intelligence for the masses” takes the BI out of the hands of analysts and into the hands of employees closest to the customer Culture Set by executives and managers.  Best way to encourage BI is to measure the performance of key indicators

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Databases

  • 2.
  • 3.
  • 4.
  • 5. Example DB with more than 1 theme A DB however can manage multiple Theme
  • 6.
  • 7.
  • 8. Figure 4-3 Student Table (also called File)
  • 9.
  • 10.
  • 11. High Quality Information Accuracy Are all values correct? Is name spelt correctly or $ amount right. Completeness Are any values missing? Does address include state and zip code? Consistency Is aggregate or summary information in agreement with detailed information? Example, do all total fields equal the true total of individual fields? Uniqueness Is each transaction, entity, and event represented only once in the information? Are their duplicate customers? Timeliness Is information current with respect to the business requirements? Is data updated weekly, daily, or hourly?
  • 12.
  • 13.
  • 14.
  • 15.
  • 16. Database Advantages Increased Flexibility Needs to be able to handle changes quickly; It also needs to be able to allow users to use information in the many different ways they may need to Increased Scalability & Performance Manages large masses of information and large numbers of users in ways non-technical solutions could not! Reduced Redundancy Keeps organizations from storing the same information in multiple places Increased Integrity Is a measure of the quality of information. Integrity constraints are rules that help ensure the quality of information Increased Security Managed with passwords and levels of authorizations
  • 17.
  • 18.
  • 19. Model of a typical Data Warehouse
  • 20.
  • 21.
  • 22.
  • 23.