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Vertical Fragmentation 10 LetQ= {Q1, Q2,Q3,Q4}bea setofqueries, A={A1,A2,A3,A4}asetof attributes, ands={S1,S2,S3}aset ofsites. ThematrixintheFigureldescribestheattributeusagevaluesandtheoneinFigure2givestheapplication accessfrequencies.Assumeth atA listheprimarykey. Usethebondenergyalgorithmandtheverticalpartitioningalgorithmtoobtainaverticalfragmentationoft he setofattributesinA. A1 A2 A3 A4 Q10 1 1

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Vertical Fragmentation 10 LetQ= {Q1, Q2,Q3,Q4}bea setofqueries, A={A1,A2,A3,A4}asetof attributes, ands={S1,S2,S3}aset ofsites. ThematrixintheFigureldescribestheattributeusagevaluesandtheoneinFigure2givestheapplication accessfrequencies.Assumeth atA listheprimarykey. Usethebondenergyalgorithmandtheverticalpartitioningalgorithmtoobtainaverticalfragmentationoft he setofattributesinA. A1 A2 A3 A4 Q10 1 1 0 Q21 1 1 0 Q31 0 0 1 Q40 0 1 0 Figurel:Thismatrixshowswhichattributeseachqueryuses. si S2 S3 Q1 | 10 200 Q25 0 10 Q30 355 Q4 0 100 Figure2:Thismatrixshowshowofteneachsiteexecutesqueries

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