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时间:2018-12-07
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1、DesignofaReal-TimeSQLEngineinDistributedEnvironmentDejiChenandAloysiusK.MokDepartmentofComputerSciencesUniversityofTexasatAustinAustin,TX78712AbstractReal-timedatabaseresearchhasreachedapointwhenapracticalapproachneedtobefoundtocombineacademicresearchfruitswithre
2、alworldproblems.Itisgenerallybelievedthatthetransactionschedulingprinciplesofthetraditionaldatabasemanagementistoostringenttomeetreal-timeconstraints.Inthispaper,welookattherealworldproblemandarguethatthefuturewillseetheproliferationoffederateddatabaseconsistingo
3、fdistributedheterogeneoussubdatabases.Weproposethesimilaritypredicatetounifyreal-timeconstraintsonapplicationsofthefederateddatabasesystem.Wethendesignareal-timeSQLenginethatsitsbetweenthedistributeddatabaseandtheapplicationsthatseparatesthedatabasedesignfromindi
4、vidualuserapplication.Thereal-timepartoftheenginebentsfromSQLstandardandcanbescaledfromemptytoverysophisticated.keywords:database;SQL;enginebents1IntroductionPeoplehavebeenworkingondatabaseforalongtime.Adatabaseissimultaneouslyusedbymultipleclients,andeachclientt
5、ransactionmustsatisfyACID(Atomicity,Consistency,Isolation,andDurability)property[13].Thecommercialdatabasehasbeenevolvingfromrelationaltoobject-oriented.ThestandardquerylanguageSQLisalsogoingthroughamajorrevisiontoSQL96.Weseeamateurmarketfordatabasetechnology.The
6、real-timeresearchhasalsobeenveryactive.Ascomputertechnologyadvancesrapidly,wearefacingtheproblemofmanaginglargedatawithreal-timerequirements.Thedatabaseworldfrequentlyhasreal-timeapplications;andthereal-timeworldoftenfacesapplicationswithalargeamountofdatathatsim
7、plycouldnotbeadhocmanaged.Therehasbeenmuchworkfrombothworlds.Basedonreal-timeexpertise,therearepapersonaddingdatabasetoreal-timeapplications[4,8,10,11].Theyanalyzewhatthedatabasedesignshouldbetosatisfyreal-timerequirements.Manyinsightshavebeenobtainedfromreal-tim
8、edatabaseexperimentationsL3,11J.Basedondatabaseexpertize,therearealsopapersonaddingreal-timefeaturetodatabasesystems.Wolfeetal.alsohelpstandardcommitteestoenha
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