Optimization of Multi—Join Queries in Shared—Nothing Systems-中国期刊网

摘要 Thispaperproposesasemi-greedyframeworkforoptimizingmulti-joinqueriesinshared-nothingsystems.Theplangeneratedbytheframeworkcomprisesseveralpipelines,eachperformingseveraljoins.Theframeworkdeterminesthe“optimal”numberofjoinstobeperformedineachpipeline.Thedecisionsaremadebasedonthecostestimationoftheentireprocessingplan.Twoexistingoptimizationalgorithmsareextendedundertheframework.Ananalyticalmodelispresentedandusedtocomparethequalityofplansproducedbyeachoptimizationalgorithm.Ourstudyshowsthatthenewalgorithmsoutperformtheircounterpartsthatarenotextended.

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Optimization of Multi—Join Queries in Shared—Nothing Systems

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Optimization of Multi—Join Queries in Shared—Nothing Systems

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