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Data Warehousing - 101

Data Warehousing - 101. January 16, 2009 Kristine Vreugdenhil, MS. Definitions. Data - A collection of facts usually collected as the result of experience, observation or experiment.

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Data Warehousing - 101

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  1. Data Warehousing - 101 January 16, 2009 Kristine Vreugdenhil, MS

  2. Definitions • Data - A collection of facts usually collected as the result of experience, observation or experiment. Datais often viewed as a lowest level of abstraction from which information and knowledge are derived. • Information - A collection of facts or data; the meaning given to data by the way it is interpreted. • Database - A structured collection of records or data.

  3. Definitions (continued) • Transactional Database – A database in which data is modified. Examples of Transaction Databases include BiTech, Zangle, Oasys, Edulog, etc. • Data Dictionary – A centralized repository of information about data such as meaning, relationships to other data, origin, usage and format.

  4. Definitions (continued) Data Warehouse – A copy of transaction data specifically structured and formatted for queries and reporting. A repository of an organization’s electronic data used for reporting and analysis. A well-designed data warehouse includes a data dictionary.

  5. Purpose of a Data Warehouse • To collect, merge, and store data, often from multiple sources or databases, for the purpose of decision-making and ongoing progress monitoring. • Pre-processing of data

  6. Data Warehouse Benefits • Central location for most-to-all reports. • Improved consistency and accuracy. • Fewer processing delays. • Transaction data is protected in a separate database. • New Reports may be added quickly with or without technology department intervention. • Ability to track data longitudinally.

  7. Data Warehouse Risks • Reports may not be used • Accuracy & relevancy of data • Potential for information overload • Staff education and learning curve • Development and maintenance costs • Is the value-added worth it?

  8. Progress to Date & Next Steps • Evaluation of reporting options – Fall 2007 • District staff needs assessment – February 2008 • Proposal for District Leadership staff – final draft completed

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