Kap. 10 Anwendungen Relationaler Systeme
Kap 10.2 Datawarehouse (DWH)
Decision Support Systeme fürs Management Online Analytial Processing (OLAP)
Dim1_L3_Id Dim1_Id
DIM3
DIM2 S,T
ALL Dim1_L1_Id Dim1_L3_Id Dim1_L2_Id Dim1_Id
DIM1
DIM3
DIM2 S,T
Dim1_
L1_Id Dim1_
L2_Id Dim1_
L3_Id Dim1_
Id Dim2_
Id Dim3_
Id S (Sales)
T (Turn- over)
MD View Relational View
ALL
Dim1_L1_Id Dim1_L3_Id Dim1_L2_Id Dim1_Id
OLAP Application Level
ROLAP Middleware
RDBMS
MD Model
Relational Model
Schema Transformation
MDQL to ROLAP Algebra Translation
ROLAP Algebra to SQL Translation
Region
Nation CUSTOMER
All Customer
Sales Organization
Distribution Channel DISTRIBUTION
All Distributions PRODUCT
Type
Brand All Products
Year TIME
All Time
Quarter
Dimensionen mit Hierarchien
eg R
n io n io at N
ra T T de e yp
us B es in s T e yp
ll A us C m to
ypT e raB nd ateg C y or on C
inta
er
uct od s Sales
Cost Quantity
Year
Month Quarter
Typische Aggregations-Anfragen
select Brand, Quarter, sum(Sales) from SalesCube
group by Brand, Quarter
having sum(Sales) > 100.000
Typische Aggregations-Anfragenmit Restriktionenpro Dimension
select Brand, Quarter, sum(Sales) from SalesCube
where Year = 2002 and Nation = Germany group by Brand, Quarter
having sum(Sales) > 100.000
Sales Cost Quantity
Region
Nation
Trade Type
Business Type All Customer
Distribution Year
Month All Time
Type Brand Category Container
Sum - Sales Year Quarter
1998 1998 Total Total
Region Nation 1 2 3 4
Asia China
Japan Asia Total
Europe France Germany Spain Europe Total Total
1
1 2
2
3 9
7
5 8
4 7
5 8
6 4
{ } { }{ }
{ }{ } { }{ }{ }þýü
îí
=ìYear Year gionNation gionNation gionNation Nation Quarter Year gion Quarter Year Nation gion Quarter G Year
F G R pot
, , Re , , Re , , Re , ,
, , , Re , , , , Re , ,
) , , (
