DataStage官方培训教程.ppt

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1、DataStageEssentialsHashedFilesServerEditionThisdocumentandthesoftwaredescribedhereinarethepropertyofAscentialSoftwareCorporationanditslicensorsandcontainconfidentialtradesecrets.Allrightstothispublicationarereserved.Nopartofthisdocumentmaybereproduced,transmitted,transcribed

2、,storedinaretrievalsystemortranslatedintoanylanguage,inanyformorbyanymeans,withoutpriorpermissionfromAscentialSoftwareCorporation.Copyright©2003AscentialSoftwareCorporation.AllrightsReservedAscentialSoftwareCorporationreservestherighttomakechangestothisdocumentandthesoftware

3、describedhereinatanytimeandwithoutnotice.Nowarrantyisexpressedorimpliedotherthananycontainedinthetermsandconditionsofsale.AscentialSoftwareCorporation50WashingtonStreetWestboro,MA01581-1021USAPhone:(508)366-3888Fax:(508)366-3669Ascential,DataStage,INTEGRITY,MetaRecon,MetaSta

4、geandMetaBrokeraretrademarksofAscentialSoftwareCorporation.PickisaregisteredtrademarkofPickSystems.AscentialSoftwareisnotalicenseeofPickSystems.Othertrademarksandregisteredtrademarksarethepropertyoftherespectivetrademarkholder.10/18/2021Uponmodulecompletion,studentswillbeabl

5、eto:DefinewhatahashedfileisListdifferenttypesofhashedfilesListvarioususesforhashedfilesCreatehashedfilesSourcehashedfilesUsecachingattributestoacceleratereadsandwritesImportmetadatafromhashedfilesDeletehashedfilesModuleObjectives©2003AscentialSoftwareCorporation.AllRightsRes

6、ervedReproductionand/orRedistributionIsProhibited.WhatisaHashedFile?ADataStagefilewrittentothefilesystemMostuseahashingalgorithmbasedonkeycolumnvaluesFilescanbecatalogedintheproject’sVOCfileforeasyretrieval©2003AscentialSoftwareCorporation.AllRightsReservedReproductionand/or

7、RedistributionIsProhibited.TypesofHashedFiles21differenttypesType1and19donotuseahashingalgorithmTypes2-18arestatichashedfilesanduseahashingalgorithmType25isstaticandusesaB-treealgorithmType30isdynamicandusesahashingalgorithm©2003AscentialSoftwareCorporation.AllRightsReserved

8、Reproductionand/orRedistributionIsProhibited.UsesofHashedFilesGoodforlocall