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ABAP面试问题和答案ABAP面试问题和答案WhatisanABApdatadictionary?-ABAp4datadictionarydescribesthelogicalstructuresoftheobjectsusedinapplicationdevelopmentandshowshowtheyaremappedtotheunderlyingrelationaldatabaseintables/views.Whataredomainsanddataelement?-Domains:Domainisthecentralobjectfordescribingthetechnicalcharacteristicsofanattributeofanbusinessobjects.Itdescribesthevaluerangeofthefield.DataElement:Itisusedtodescribethesemanticdefinitionofthetablefieldslikedescriptionthefield.Dataelementdescribeshowafieldcanbedisplayedtoend-user.Whatisforeignkeyrelationship?-Arelationshipwhichcanbedefinedbetweentablesandmustbeexplicitlydefinedatfieldlevel.Foreignkeysareusedtoensuretheconsistencyofdata.Dataenteredshouldbecheckedagainstexistingdatatoensurethattherearenowcontradiction.Whiledefiningforeignkeyrelationshipcardinalityhastobespecified.Cardinalitymentionshowmanydependentrecordsorhowreferencedrecordsarepossible.Describedataclasses.-Masterdata:Itisthedatawhichisseldomlychanged.Transactiondata:Itisthedatawhichisoftenchanged.Organizationdata:Itisacustomizingdatawhichisenteredinthesystemwhenthesystemisconfiguredandisthenrarelychanged.Systemdata:ItisthedatawhichR/3systemneedsforitself.Whatareindexes?-Indexesaredescribedasacopyofadatabasetablereducedtospecificfields.Thisdataexistsinsortedform.Thissortingformeasefastaccesstothefieldofthetables.Inorderthatotherfieldsarealsoread,apointertotheassociatedrecordoftheactualtableareincludedintheindex.Yheindexesareactivatedalongwiththetableandarecreatedautomaticallywithitinthedatabase.Differencebetweentransparenttablesandpooledtables.-Transparenttables:Transparenttablesinthedictionaryhasaone-to-onerelationwiththetableindatabase.Itsstructurecorrespondstosingledatabasefield.Tableinthedatabasehasthesamenameasinthedictionary.Transparenttableholdsapplicationdata.pooledtables.pooledtablesinthedictionaryhasamany-to-onerelationwiththetableindatabase.Tableinthedatabasehasthedifferentnameasinthedictionary.pooledtablearestoredintablepoolatthedatabaselevel.What
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