欢迎来到天天文库
浏览记录
ID:34625154
大小:193.58 KB
页数:10页
时间:2019-03-08
《architectural impact on performance of a multilevel database system》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、ArchitecturalImpactonPerformanceofaMultilevelDatabaseSystemMyongH.KangandJudithN.FroscherRaviMukkamalaNavalResearchLaboratoryOldDominionUniversityInformationTechnologyDivisionDepartmentofComputerScienceWashington,D.C.20375Norfolk,VA23529Abstractwhicharestoredseparately,u
2、nderthecontrolofase-curitykernelenforcingamandatoryaccesscontrolpol-Sinceprotectionandassurancearetheprimarycon-icy.Thekernelizedapproachcanyieldreducedperfor-cernsinMLSdatabases,performancehasoftenbeenmanceduetotheneedforrecombiningsingleleveldatasacricedinsomeknownMLS
3、databaseapproaches.toproducemultileveldata.Motivatedbyperformanceconcerns,areplicatedar-Twobasicarchitecturalapproachesweresuggestedchitectureapproachwhichusesaphysicallydistinctunderthedistributedapproach:(i)EachDBMShasbackenddatabasemanagementsystemforeachsecu-dataatas
4、inglesecuritylevel,and(ii)EachDBMSritylevelisbeinginvestigated.containsdataatagivensecuritylevelandalldataatThisisareportonthebehaviorandperformancelowersecuritylevels(replicatedapproach).issuesforthereplicatedarchitectureapproach.Espe-Therstapproachhasbeeninvestigated[
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
此文档下载收益归作者所有