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Unformatted text preview: Chapter 6 Databases and Data Warehouses Data- raw facts that describe the characteristics of an event Information- data converted into a meaningful and useful context Characteristics of high quality information: Accuracy- are all the values correct? Completeness- are any of the values missing? Consistency- is aggregate or summary information in agreement with detailed information? Uniqueness- is each transaction, entity, and event represented only once in the information? Database- maintains information about various types of objects (inventory), events (transactions), people (employees), and places (warehouses) Hierarchical database model- information organized into tree-like structure that allows repeating information using parent/child relationships in such a way that it cannot have too many relationships Network database model- a flexible way of representing objects and their relationships. Allows each record to have multiple parent and child records, forming a lattice (network) structure...
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This note was uploaded on 12/04/2011 for the course ITM 309 taught by Professor Rodammer during the Spring '08 term at Michigan State University.
- Spring '08