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# Multidimensional analysis

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Multidimensional Analysis Introduction …

Multidimensional Analysis Introduction
Basic Concepts like Cube/OLAP/MDX

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• 不是很严谨维度是一种描述信息，往往业务数据有很多维度对其的分析通常有钻取、切片、切块等
• Dimension和FactDimension是Fact的描述信息，是它的上下文Dimension中包含了Hierarchy，即层次，Hierarchy包含了Level，即层，Level中包含了Member，Member的描述属性就是Attribute
• 微软推出事实标准
• ### Transcript

• 1. Multidimensional Analysis
Author: Sid Xing
• 2. Content
Multidimensional
Cube
OLAP
MDX
Solutions
• 3. What is multidimensional?
Sales = \$2.5
US Sales = \$2.5
US 2010 Sales = \$2.5
IBM US 2010 Sales = \$2.5
….
1 dimension
2 dimensions
>= 3 dimensions
Dot
Line
Flat
Cube
• 4. What’s a “Cube”?
Cell
Dimension
Members
Jan
...
Start
End
Q1
Q2
...
April 1
June 30
Feb
2005
2006
...
Attributes
Hierarchy/Levels
Products
Order Methods
Camping Equipment
Golf Equipment
Fax
Outdoor Protection
Telephone
Mountaineering Equipment
Mail
Personal Accessories
E-Mail
Web
Time
2005
Q1
Q2
Q3
Q4
• 5. Cube Intro
Cube:
Mapping
Tables:
• OLAP
OLAP = Online Analysis Processing
ROLAP = Relational OLAP
MOLAP = Multidimensional OLAP
HOLAP = Hybrid OLAP
• 11. ROLAP vs. MOLAP
• 12. MDX
MDX = Multidimensional Expression
Query language for OLAP database, like SQL for relational database.
Eg.
SELECT { [Measures].[Store Sales] } ON COLUMNS,
{ [Date].[2002], [Date].[2003] } ON ROWS
FROM Sales
WHERE ( [Store].[USA].[CA] )
• 13. Popular Solutions
IBM CognosPowerPlay / TM1
Oracle Hyperion Essbase
Microsoft SQL Server Analysis Service
An Introduction to OLAP in SQL Server 2005
• 14. Reference
OLAP/MOLAP/ROLAP/HOLAP
Wikipedia: Multidimensional Analysis
Wikipedia: MDX
OLAP, Cubes and Multidimensional Analysis
• 15. Thanks