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Note that, the functions used in this article can be applied to evaluate the validity of any other clustering methods.In this section, we describe the most widely used clustering validation indices.The SQL in listing 8.3 will perform an Oracle analyze index xxx validate structure for each index in the schema and report of the resulting values in the Oracle index_stats.

Look at the within.(within clusters sum of squares), the average.within (average distance within clusters) and silwidths (vector of cluster average silhouette widths).0;ji.prototype.cancel=function(a);function ri(a,b){if(0==a.o)if(a.ha){var c=a.ha;if(c.w) function Li(a,b,c) function Ki(a,b,c) Gi.prototype.ta=function(a,b);function Pi(a);function Qi(a,b) ;var Ri=/^(? La=function();function bj(a) C(bj,$i);bj.prototype[th]=! 0;r=bj.prototype;r.listen=function(a,b,c,d);r.ag=function();r. The DBA_INDEX view contains statistical information that is placed into the view when the Oracle ANALYZE INDEX xxx command is issued.Unfortunately, the DBA_INDEXES was designed to provide information to the cost-based SQL optimizer.

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