7. Multi-Tiered Architecture
Monitor
& OLAP Server
other Metadata
source Integrator
s Analysis
Operational Extract Query
Transform Data Serve Reports
DBs Load
Refresh
Warehouse Data mining
Data Marts
Data Sources Data Storage OLAP Engine Front-End Tools
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10. A Concept Hierarchy: Dimension
(location)
all
all
region Europe ... North_America
country Germany ... Spain Canada ... Mexico
city Frankfurt ... Vancouver ... Toronto
office L. Chan ... M. Wind
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11. Multidimensional Data
? Sales volume as a function of product,
month, and region Dimensions: Product, Location, Time
Hierarchical summarization paths
o n
gi
Industry Region Year
Re
Category Country Quarter
Product
Product City Month Week
Office Day
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Month 11
12. Data warehousing V.S. OLTP
? Data warehousing ? OLTP
– Querying and – Inputting and
Reporting Updating
– For Reading – For Writing
– 用來分析企業運作狀 – 企業中以日為單位所
況的資料 ( 如彙總資 處理的資料
料) – 高揮發性且即時
– 非揮發性 – 幾乎沒有多餘資料
– 充斥著多餘資料 – 高度正規化
– 反正規化 – 關連式資料庫模型
– 多維資料庫模型
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