CostBased.Oracle.Fundamentals
ThetypicalcostofusingaB-treeindexcomprisesthreecomponents—thedepthoftheindex,basedontheblevel;thenumberofindexleafblocksthatwillbevisited,basedonleaf_blocks;andthenumberofvisitstotableblocks,basedontheclustering_factor.Theclustering_factorofanindexisaprimaryindicatorofhowdesirab
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ORACLE必读的经典国外书籍，资源很好，字很清楚！