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CWM: A Model-based Architecture For Data Warehouse Interchange

Doug TolbertPacific Development Lab

Unisys Corporation

Mission Viejo, CAdoug.tolbert@unisys.com

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CWM Submitters & Supporters

• Submitters– IBM– Unisys– Oracle– NCR– Hyperion– UBS AG– Genesis Development– Dimension EDI

• OMG Specs: http://www.omg.org• CWM Info: http://www.cwmforum.org

• Supporters– Deere & Co.– Sun Microsystems– Hewlett-Packard– Data Access Technologies– InLine Software– Aonix– Hitachi

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Source

Source

Source

Target

Target

Target

Source

Source

Source

CWM Tool

Target

Target

Target

Pairwise (9 connections)

Hub (6 connections)

Figure 1. Data warehouse source and target arrangements.

The CWM Metamodel

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OMG Metamodel Architecture

Standard OMG ComponentsModeling Language: UMLMetadata Interchange: XMIMetadata API:

MOF IDL Mapping

MIDDLEWARE

APPLICATION

User Data/ObjectLayer (M0)

Metadata/Model Layer(M1)

Metamodel Layer(M2)

Meta-metamodelLayer (M3)

<Stock name=“IBM” price=“112”/>

Stock: name, price

UML: Class, AttributeCWM: Table, Column ElementType, Attribute

MOF: Class, Attribute, Operation, Association

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The CWM Metamodel

WarehouseProcess

WarehouseOperation

Transformation

XMLRecordMulti

DimensionalRelational

BusinessInformation

SoftwareDeployment

UML 1.3(Foundation, Behavioral_Elements, Model_Management)

Management

Resource

Analysis

Object(UML)

Foundation

OLAPData

MiningInformation

VisualizationBusiness

Nomenclature

DataTypes

ExpressionsKeysIndex

TypeMapping

Counts Classes Associations

CWM 157 115

CWMX 130 77

Total 287 192

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View

isReadOnly : BooleancheckOption : BooleanqueryExpression : QueryExpression

SQLQuery

query : QueryExpression

Table

isSystem : Boolean/ optionScopeColumn : Column/ type : SQLStructuredType/ usingTrigger : Trigger

SQLSimpleType

characterMaximumLength : IntegercharacterOctetLength : IntegernumericPrecision : IntegernumericPrecisionRadix : IntegernumericScale : IntegerdateTimePrecision : Integer

SQLDistinctType

length : Integerprecision : Integerscale : Integer/ sqlSimpleType : SQLSimpleType

1

0..*

sq lSimpleType

1

sqlDistinctType0..*

DistinctTypeHasSimpleTypeBaseTable

isTemporary : BooleantemporaryScope : String/ trigger : Trigger

ColumnSet

SQLDataType

typeNumber : Integer

CheckConstraint

deferrability : DeferrabilityType

0..*

0..*

/constraint0..*

/constrainedElement0..*

{ordered}

Column

precision : Integerscale : IntegerisNullable : NullableTypelength : IntegercollationName : StringcharacterSetName : String/ optionScopeTable : Table/ referencedTableType : SQLStructuredType

0..*

0..1 /feature

0..*{ordered}

/owner

0..1

0..*

1/structuralFeature

0..* /type

1

0..* 0..*

/constraint0..* /constrainedElement 0..*

{ordered}

CWM Relational Metamodel (Partial)

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Transformation

• General mechanism describing data movement and lineage

• Generic transformations from any physical object to any other physical object

• Maps logical structures and concepts in the warehouse onto physical implementation

• Provides for multiple physical implementations of logical structures and concepts

Logical Object

Physical Object

Logical Object

Physical Object

Mapping Mapping

X-Form

X-Form

Conceptual Object

Conceptual Object

Mapping

X-Form

Mapping

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Catalog/Schema

Table ColumnRelational

RecordRecordFile FieldRecordDef

XMLSchema AttributeElementType

Multi-dimensional

Dimension DimensionedObject

Schema

ClassPackageObjectOriented

Attribute

RowSet Row ColumnValue

RecordSet FieldValue

Record

Document Element

Member MemberValue

MemberSet

ObjectExtent DataValue

Intent ExtentResource

DataValue

CWM Data Resource Matrix

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CWM Extension Packages

Olap<<metamodel>>

(from Analysis)

InformationSet<<metamodel>>

(from Analysis)

InformationReporting

<<metamodel>>

(from Analysis)

Record<<metamodel>>

(from Resource)

Multidimensional<<metamodel>>

(from Resource)

COBOLData<<metamodel>>

(from Resource)

DMSII<<metamodel>>

(from Resource)

IMSDatabase<<metamodel>>

(from Resource)

Essbase<<metamodel>>

(from Resource)

Express<<metamodel>>

(from Resource)

DataTypes<<metamodel>>

(from Foundation)

CORBAIDLDataTypes

<<metamodel>>

(from Foundation)

UML

(from org.omg)

ER<<metamodel>>

(from Foundation)

InformationVisualization

<<metamodel>

(from Analysis)

Extension Techniques•Metamodel specialization•XMI extensions•UML tagged values

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CWM Package Architecture

Modular Design– Minimum dependencies

• Cross package services provided by links to UML

– Avoid subpackages– Reduced complexity,

improved understanding– Use only the packages you

need

org.omg UML CWM Foundation <<metamodel>> DataTypes <<metamodel>> TypeMapping <<metamodel>> KeysIndexes <<metamodel>> Expressions <<metamodel>> BusinessInformation <<metamodel>> SoftwareDeployment Resource <<metamodel>> Relational <<metamodel>> Record <<metamodel>> Multidimensional <<metamodel>> XML Analysis <<metamodel>> Transformation <<metamodel>> Olap <<metamodel>> BusinessNomenclature <<metamodel>> DataMining <<metamodel>> InformationVisualization Management <<metamodel>> WarehouseProcess <<metamodel>> WarehouseOperation CWMX

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CWM Demo

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CWM Timeline

September 1998– RFI issued

January 1999– First team meeting

November 1999– Initial Submission– Proof of Concept Demo

March 2000– Final Submission– Adoption by OMG Tech

Committee & Architecture Board

June 2000– Fax vote ends– Board of Directors vote

September 2000– FTF completes– Interoperability Showcase– Usage Guide– First OMG “Available

Specification”?