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1CAISE 2013 June 17-21 2013 Valencia – Spain

Fadila Bentayeb 1

CAISE 2013Valencia -

Spain

A Layered Multidimensional Model of

Complex ObjectsDoulkifli BOUKRAAOmar BOUSSAIDFadila BENTAYEB : fadila.bentayeb@univ-lyon2.fr Djamel-Eddine ZEGOUR

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Context

Data Sources Data

WarehouseETL

On-Line Analysis (OLAP)Decision

OLAP

Data Integration

Multidimensional Modeling

Personalization/Recommmendation

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Context

Data sourcesWeb data Multimedia data…

Star schema modelSimple modelNot flexible

OLAP analysisSimple Navigations through aggregated data

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Star Schema model ?

What is Star Schema?Set of related tables: Fact table and Dimension tablesFact table contains a set of indicators (measures)Dimension tables are analysis axes

Star SchemaLogical Model inspired from E/R modelLack of conceptual model

Not well adapted to non-flat data

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Example of Star Schema Model

LOCATIONlocation_keystorestreet_addresscitystatecountryregion

PRODUCT

product_keyproduct_namecategorybrandcolorsupplier_name

TIME

time_keydayday_of_the_weekmonthquarteryear

SALES

time_keyproduct_keylocation_key

units_soldamount

Sales Data Warehouse

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Challenge

Warehousing complex dataNew Multidimensional modelAdapted to complex data

Analyzing complex dataBuilding Complex data cubesDefining more elaborated OLAP operators

User-centric data cube modelsPersonalized data cubes

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Outline

Related WorkMultidimensional Model for complex dataCubic ProjectionImplementation Conclusion

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Outline

Related WorkMultidimensional Model for complex dataCubic ProjectionImplementation Conclusion

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Related Work

Object-oriented multidimensional modelingTrujillo (98, 99, 00, 04), Lujan-Mora (02), Abello (01, 06)

Multidimensional modeling from E/R and XML formalisms: Nassis (04, 06), Golfarellli (98)

Multidimensional modeling of documents, spatial data, text: Bret (99)

Multidimensional Modeling of complex data: Pedersen (99), Jensen (01)

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Related Work

Existing models do not integrate data warehouse features

Complex facts and compex dimensionsHierarchies within complex dataHierarchies between complex data

Symmetric treatment of complex data as fact or dimension

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Outline

Related WorkMultidimensional Model for complex dataCubic ProjectionImplementation Conclusion

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Motivating Example: Auction Class Diagram

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A 2-Layered Multidimensional Model

Object-oriented modelComplex object

Two modeling layersObject Class diagram layerPackage Diagram Layer

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A Layered Multidimensional Model

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Main Concepts

Complex object: complex data of real world

Complex relationshipLink between complex objects

Attribute hierarchyPartial ordering relationship between the attributes of a complex object

Object hierarchyPartial ordering relationship between complex objects

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Complex Object

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Complex Relationship

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Attribute Hierarchy

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Object Hierarchy

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Auction Multidimensional model

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Outline

Related WorkMultidimensional Model for complex dataCubic ProjectionImplementation Conclusion

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A 3-Layered Data Cube model

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Cubic Projection

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Complex Cube Layers

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Auction Derived Data Cube

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Outline

Related WorkMultidimensional Model for complex dataCubic ProjectionImplementation Conclusion

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Implementation

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Outline

Related WorkMultidimensional Model for complex dataCubic ProjectionImplementation Conclusion

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Conclusion

Multidimensional Conceptual model Object-oriented model for complex data

Cubic projectionPersonalysed Data cubes

Different modeling layersSelection of facts and dimensions at a conceptual level

Define more elaborated OLAP operators

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Thank you

Fadila Bentayeb