architectural impact on performance of a multilevel database system

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1、ArchitecturalImpactonPerformanceofaMultilevelDatabaseSystemMyongH.KangandJudithN.FroscherRaviMukkamalaNavalResearchLaboratoryOldDominionUniversityInformationTechnologyDivisionDepartmentofComputerScienceWashington,D.C.20375Norfolk,VA23529Abstractwhicharestoredseparately,u

2、nderthecontrolofase-curitykernelenforcingamandatoryaccesscontrolpol-Sinceprotectionandassurancearetheprimarycon-icy.Thekernelizedapproachcanyieldreducedperfor-cernsinMLSdatabases,performancehasoftenbeenmanceduetotheneedforrecombiningsingleleveldatasacricedinsomeknownMLS

3、databaseapproaches.toproducemultileveldata.Motivatedbyperformanceconcerns,areplicatedar-Twobasicarchitecturalapproachesweresuggestedchitectureapproachwhichusesaphysicallydistinctunderthedistributedapproach:(i)EachDBMShasbackenddatabasemanagementsystemforeachsecu-dataatas

4、inglesecuritylevel,and(ii)EachDBMSritylevelisbeinginvestigated.containsdataatagivensecuritylevelandalldataatThisisareportonthebehaviorandperformancelowersecuritylevels(replicatedapproach).issuesforthereplicatedarchitectureapproach.Espe-Therstapproachhasbeeninvestigated[

5、6,12].This1cially,wecomparetheperformanceoftheSINTRAapproachhasinherentproblemsbecausehigherlevelMLSdatabasesystemtothatofatypicalconventionalquerieshavetobepropagatedtolowerleveluntrusted(non-secure,single-level)databasesystem.Afterob-backendtorequestdata.Hence,wedon'te

6、xpectthisservingtheperformancebottlenecksfortheSINTRA,approachtobeusedforhighlyassuredMLS-DBMS.wepresentsolutionsthatcanalleviatethem.Thisapproachalsocanyieldreducedperformancebe-causeitmayrequirefragmentstobetransferredfromalowtoahighbackendDBMStopresentamultilevel1Intr

7、oductionrelationtousers.ThemultileveldatamanagementsecuritysummerThereplicatedarchitectureapproach[5]usesaphysi-studyin1982[1]recommendedthreenear-termap-callydistinctbackenddatabasemanagementsystemforproachestosolvingthemultilevelsecure(MLS)eachsecuritylevel.Eachbackend

8、databasecontainsdatabasemanagementsystem(DBMS)problem:In-informationatagivensecuritylevelandalldataatte